WO2000072505A1 - Network publishing authorization protocol - Google Patents

Network publishing authorization protocol Download PDF

Info

Publication number
WO2000072505A1
WO2000072505A1 PCT/AU2000/000541 AU0000541W WO0072505A1 WO 2000072505 A1 WO2000072505 A1 WO 2000072505A1 AU 0000541 W AU0000541 W AU 0000541W WO 0072505 A1 WO0072505 A1 WO 0072505A1
Authority
WO
WIPO (PCT)
Prior art keywords
server
page
netpage
user
network
Prior art date
Application number
PCT/AU2000/000541
Other languages
French (fr)
Inventor
Paul Lapstun
Original Assignee
Silverbrook Research Pty Ltd
Silverbrook, Kia
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AUPQ0559A external-priority patent/AUPQ055999A0/en
Priority claimed from AUPQ1313A external-priority patent/AUPQ131399A0/en
Priority to CA2371584A priority Critical patent/CA2371584C/en
Priority to JP2000619854A priority patent/JP2003500714A/en
Priority to EP00929057A priority patent/EP1222773B1/en
Priority to DE60029462T priority patent/DE60029462D1/en
Application filed by Silverbrook Research Pty Ltd, Silverbrook, Kia filed Critical Silverbrook Research Pty Ltd
Priority to MXPA01012115A priority patent/MXPA01012115A/en
Priority to AU47280/00A priority patent/AU4728000A/en
Priority to IL14663600A priority patent/IL146636A0/en
Priority to BR0010854-5A priority patent/BR0010854A/en
Publication of WO2000072505A1 publication Critical patent/WO2000072505A1/en
Priority to IL146636A priority patent/IL146636A/en
Priority to HK03100076.4A priority patent/HK1048030A1/en

Links

Classifications

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    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3261Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of multimedia information, e.g. a sound signal
    • H04N2201/3266Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of multimedia information, e.g. a sound signal of text or character information, e.g. text accompanying an image
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3261Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of multimedia information, e.g. a sound signal
    • H04N2201/3267Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of multimedia information, e.g. a sound signal of motion picture signals, e.g. video clip
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3269Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of machine readable codes or marks, e.g. bar codes or glyphs
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3269Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of machine readable codes or marks, e.g. bar codes or glyphs
    • H04N2201/327Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of machine readable codes or marks, e.g. bar codes or glyphs which are undetectable to the naked eye, e.g. embedded codes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3278Transmission
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/18Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00Energy efficient computing, e.g. low power processors, power management or thermal management
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00Data processing: database and file management or data structures
    • Y10S707/99941Database schema or data structure
    • Y10S707/99942Manipulating data structure, e.g. compression, compaction, compilation
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/17Surface bonding means and/or assemblymeans with work feeding or handling means
    • Y10T156/1798Surface bonding means and/or assemblymeans with work feeding or handling means with liquid adhesive or adhesive activator applying means

Definitions

  • the present invention relates generally to methods, systems and apparatus for interacting with computers It relates particularly to a network publishing authorization protocol, for use in a network connected to a printer, a server and a publisher of network publications
  • the invention has been developed primarily to allow a large number of dist ⁇ mped users to interact with networked information via printed matter and optical sensors, thereby to obtain interactive p ⁇ nted matter on demand via high-speed networked color printers
  • the invention w ill largely be described herein with reference to this use. it will be appreciated that the invention is not limited to use in this field
  • PCT/AU00/00518 PCT/AU00/00518.
  • PCT/AU00/00525. PCT/AU00/00526, PCT/AU00/00527, PCT/AU00/00528, PCT/AU00/00529.
  • PCT/AUOO/00530 PCT/AU00/00531 , PCT/AU00/00532.
  • PCT/AU00/00569 PCT/AU00/00570, PCT/AU00/00571 , PCT/AU00/00572, PCT/AU00/00573, PCT/AU00/00574, PCT/AU00/00575, PCT/AU00/00576,
  • PCT/AU00/00577 PCT/AU00/00578, PCT/AUOO/00579, PCT/AU00/00581, PCT/AU00/00580, PCT/AU00/00582.
  • PCT/AUOO/00590 PCT/AUOO/00591.
  • PCT/AU00/00594 PCT/AU00/00595.
  • PCT/AU00/00516, and PCT/AU00/00517
  • Cryptography is used to protect sensitive information, both in storage and in transit, and to authenticate parties to a transaction
  • Secret-key cryptography also referred to as symmetric cryptography, uses the same key to encrypt and decrypt a message Two parties wishing to exchange messages must first arrange to securely exchange the secret key
  • Pubhc-key cryptography also referred to as asymmetric cryptography, uses two encryption keys
  • the two keys are mathematically related in such a way that any message encrypted using one key can only be decrypted using the other key
  • One of these keys is then published, while the other is kept private
  • the public key is used to encrypt any message intended for the holder of the private key
  • a message can only be decrypted using the private ke ⁇
  • Public-key cryptography can be used to create a digital signature If the holder of the private key creates a known hash of a message and then encrypts the hash using the private key, then anyone can verify that the encrypted hash constitutes the "signature" of the holder of the private key with respect to that particular message, simply by
  • a certificate authonty is a trusted third party which authenticates the connection between a public key and someone's identity
  • the certificate authonty venfies the person's identity by examining identity documents etc , and then creates and signs a digital certificate containing the person's identity details and public key
  • anyone who trusts the certificate authonty can use the public key m the certificate with a high degree of certamty that it is genume They just have to venfy that the certificate has indeed been signed bv the certificate authonty, whose public key is well-known
  • the mvention is m a network connected to a pnnter and a publisher of network publications, a network publishing authorization protocol for authorizing the printing of a publication at the p ⁇ nter, including the steps of Addressing the publication to a user, Signing the publication usmg a pnvate key, Sending the publication to the pnnter, and
  • a user may be registered with a pnnter by creating a record in a database of a server Similarly a publisher may be registered with the server The server may hold the publisher's public key
  • the user may subscnbe to a publication of the publisher by creating a record m a database of the server authorizing the publisher to send the publication to the pnnter
  • the server may hold subscnption record for this purpose, containing details of the publisher's identity and the user's alias identity
  • the server may hold details of the user's alias identity for this purpose
  • the confirmation may be earned out at the pnnter It may be accomplished by confirming that the publisher is authorized to pnnt the publication to the pnnter, by accessmg the server to confirm the subscnption It may also involve venfymg the publisher's signature at the pnnter usmg the publisher's public key, obtained from the server It may also mvolve venfymg at the pnnter that the p ⁇ nter is registered for the user, by accessmg the server The confirmation may be earned out at the server The server may accomplish this by checking that the publisher is authorized to p ⁇ nt the publication to the pnnter, by confirming the subscnption It may also mvolve venfymg the publisher's signature usmg the publisher's public key It may also mvolve venfymg that the pnnter is registered for the user
  • the publisher may first obtain a document identity for each document to be pnnted from an identity server Then it may send each document structure, including its identity and page descnptions to a page server responsible for that document identity It may mclude its own identity, the user's alias identity and a set of multicast channel names, and it may sign the message usmg its pnvate signature
  • the page server may then use the publisher's identity and the user's alias identity to obtain the corresponding user's identity and the user's printer's identity from the registration server
  • the pnnter may be the user's default pnnter or a pnnter selected for this application
  • the confirmation is earned out by the registration server, and fails if the publisher's identity and the alias - 3 - ldentity don't together identify a subscnption
  • the page server may then allocate document and page instance identities and forwards the page descnptions, mcludmg page identities, to the p ⁇ nter It may also send the names of the multicast channels for the p ⁇ nter to listen to Finally it may return the newly allocated page identities to the publisher for future use
  • a large number of users may subsc ⁇ be to a penodical publication
  • Each user's edition may be laid out differently, but many users' editions will share common content such as text objects and image objects
  • the subscnption delivery protocol may therefore deliver document structures to mdividual pnnters via pomtcast, but deliver shared content objects via multicast
  • the application Once the application has distnaded all of the document structures to the subscnbers' selected p ⁇ nters via the relevant page servers, it multicasts the vanous subsets of the shared objects on the previously selected multicast channels Both page servers and p ⁇ nters momtor the appropnate multicast channels and receive their required content objects They are then able to populate the previously pomtcast document structures This allows the page servers to add complete documents to their databases, and it allows the pnnters to pnnt the documents
  • the confirmation may be earned out at a second server to which the publication is sent It may be accomplished by confirmmg that the publisher is authorized to p ⁇ nt the publication to the pnnter, by accessmg the first server to confirm the subscnption It may also mvolve venfymg the publisher's signature at the second server usmg the publisher's public key, obtained from the first server It may also mvolve venfying at the second server that the pnnter is registered for the user, by accessmg the first server If the confirmation succeeds, the publication may be sent from the second server to the p ⁇ nter BRIEF DESCRIPTION OF DRAWINGS
  • Figure 1 is a schematic of a the relationship between a sample p ⁇ nted netpage and its online page descnption
  • Figure 2 is a schematic view of a interaction between a netpage pen, a netpage pnnter, a netpage page server, and a netpage application server,
  • Figure 3 illustrates a collection of netpage servers and p ⁇ nters interconnected via a network
  • Figure 4 is a schematic view of a high-level structure of a p ⁇ nted netpage and its online page desc ⁇ ption
  • Figure 5 is a plan view showing a structure of a netpage tag
  • Figure 6 is a plan view showing a relationship between a set of the tags shown in Figure 5 and a field of view of a netpage sensing device m the form of a netpage pen,
  • FIG. 7 is a flowchart of a tag image processmg and decoding algo ⁇ thm
  • Figure 8 is a perspective view of a netpage pen and its associated tag-sensing field-of-view cone
  • Figure 9 is a perspective exploded view of the netpage pen shown m Figure 8.
  • Figure 10 is a schematic block diagram of a pen controller for the netpage pen shown m Figures 8 and 9, Figure 11 is a perspective view of a wall-mounted netpage p ⁇ nter,
  • Figure 12 is a section through the length of the netpage p ⁇ nter of Figure 11 .
  • Figure 12a is an enlarged portion of Figure 12 showing a section of the duplexed pnnt engines and glue wheel assembly
  • Figure 13 is a detailed view of the ink cartndge, ink, air and glue paths, and pnnt engines of the netpage pnnter of
  • Figures 11 and 12 Figure 14 is a schematic block diagram of a pnnter controller for the netpage pnnter shown m Figures 11 and 12,
  • Figure 15 is a schematic block diagram of duplexed p ⁇ nt engine controllers and MemjetTM printheads associated with - 4 - the pnnter controller shown m Figure 14,
  • Figure 16 is a schematic block diagram of the pnnt engine controller shown m Figures 14 and 15,
  • Figure 17 is a perspective view of a smgle MemjetTM pnnting element, as used m, for example, the netpage pnnter of
  • Figures 10 to 12 Figure 18 is a perspective view of a small part of an a ⁇ ay of MemjetTM p ⁇ nting elements
  • Figure 19 is a senes of perspective views illustrating the operating cycle of the MemjetTM p ⁇ nting element shown m
  • Figure 20 is a perspective view of a short segment of a pagewidth Memj etTM pnnthead
  • Figure 21 is a schematic view of a user class diagram
  • Figure 22 is a schematic view of a pnnter class diagram
  • Figure 23 is a schematic view of a pen class diagram
  • Figure 24 is a schematic view of an application class d agram
  • Figure 25 is a schematic view of a document and page descnption class diagram
  • Figure 26 is a schematic view of a document and page ownership class diagram
  • Figure 27 is a schematic view of a terminal element specialization class diagram
  • Figure 28 is a schematic view of a static element specialization class diagram
  • Figure 29 is a schematic view of a hyperlink element class diagram
  • Figure 30 is a schematic view of a hyperlink element specialization class diagram
  • Figure 31 is a schematic view of a hyperhnked group class diagram
  • Figure 32 is a schematic view of a form class diagram
  • Figure 33 is a schematic view of a digital ink class diagram
  • Figure 34 is a schematic view of a field element specialization class diagram
  • Figure 35 is a schematic view of a checkbox field class diagram
  • Figure 36 is a schematic view of a text field class diagram
  • Figure 37 is a schematic view of a signature field class diagram
  • Figure 38 is a flowchart of an mput processmg algonthm
  • Figure 38a is a detailed flowchart of one step of the flowchart of Figure 38,
  • Figure 39 is a schematic view of a page server command element class diagram
  • Figure 40 is a schematic view of a resource descnption class diagram
  • Figure 41 is a schematic view of a favontes list class diagram
  • Figure 42 is a schematic view of a history list class diagram
  • Figure 43 is a schematic view of a subscnption delivery protocol
  • Figure 44 is a schematic view of a hyperlink request class diagram
  • Figure 5 is a schematic view of a hyperlink activation protocol
  • Figure 46 is a schematic view of a handwnting recognition protocol
  • Figure 47 is a schematic view of a signature venfication protocol
  • Figure 48 is a schematic view of a form submission protocol
  • Figure 49 is a schematic view of a commission payment protocol
  • Figure 50 is a schematic view of a p ⁇ nter registration protocol
  • Figure 51 is a schematic view of a Web terminal authorization protocol
  • Figure 52 is a schematic view of a Web terminal pnnting protocol
  • - 5 - Figure 53 is a schematic view of a pen connection protocol
  • Figure 54 is a schematic view of a pen registration protocol
  • Figure 55 is a schematic view of a pen data exchange protocol
  • MemjetTM is a trade mark of Silverbrook Research Pty Ltd, Australia
  • the mvention is configured to work with the netpage networked computer system, a detailed overview of which follows It will be appreciated that not every implementation will necessanly embody all or even most of the specific details and extensions discussed below m relation to the basic system However, the system is descnbed m its most complete form to reduce the need for external reference when attempting to understand the context m which the preferred embodiments and aspects of the present mvention operate
  • the preferred form of the netpage system employs a computer interface m the form of a mapped surface, that is, a physical surface which contains references to a map of the surface maintained m a computer system
  • the map references can be quened by an appropnate sensmg device
  • the map references may be encoded visibly or invisibly, and defined m such a way that a local query on the mapped surface yields an unambiguous map reference both withm the map and among different maps
  • the computer system can contain information about features on the mapped surface, and such information can be retneved based on map references supplied by a sensmg device used with the mapped surface
  • the information thus ret ⁇ eved can take the form of actions which are initiated by the computer system on behalf of the operator in response to the operator's interaction with the surface features
  • the netpage system relies on the production of, and human interaction with, netpages
  • These are pages of text, graphics and images pnnted on ordinary paper, but which work like mteractive web pages Information is encoded on each page usmg mk which is substantially invisible to the unaided human eye
  • the ink, however, and thereby the coded data can be sensed by an optically imaging pen and transmitted to the netpage system
  • active buttons and hyperlinks on each page can be clicked with the pen to request information from the network or to signal preferences to a network server
  • text w ⁇ tten by hand on a netpage is automatically recognized and converted to computer text m the netpage system, allowing forms to be filled m
  • signatures recorded on a netpage are automatically venfied, allowing e-commerce transactions to be securely authorized
  • a p ⁇ nted netpage 1 can represent a mteractive form which can be filled m by the user both physically, on the printed page
  • the netpage pen 101 works m conjunction with a netpage pnnter 601, an Internet-connected p ⁇ nting appliance for home, office or mobile use
  • the pen is wireless and communicates securely with the netpage pnnter via a short-range radio link 9 - 6 -
  • the netpage p ⁇ nter 601, a prefened form of which is shown m Figures 11 to 13 and descnbed m more detail below, is able to deliver, pe ⁇ odically or on demand, personalized newspapers, magazmes, catalogs, brochures and other publications, all pnnted at high quality as mteractive netpages
  • the netpage pnnter is an appliance which can be, for example, wall-mounted adjacent to an area where the morning news is first consumed, such as m a user's kitchen, near a breakfast table, or near the household's pom
  • the netpage pen 101 interacts with the coded data on a pnnted netpage 1 and communicates, via a short-range radio link 9, the interaction to a netpage p ⁇ nter
  • the p ⁇ nter 601 sends the interaction to the relevant netpage page server 10 for interpretation
  • the page server sends a co ⁇ esponding message to application computer software runnmg on a netpage application server 13
  • the application server may in turn send a response which is pnnted on the ongmating p ⁇ nter
  • the netpage system is made considerably more convenient m the prefened embodiment by bemg used m conjunction with high-speed microelectromechamcal system (MEMS) based inkjet (MemjetTM) pnnters
  • MEMS microelectromechamcal system
  • MemjetTM inkjet
  • a netpage publication has the physical charactenstics of a traditional newsmagazme, such as a set of letter-size glossy pages pnnted m fiill color on both sides, bound together for easy navigation and comfortable handling
  • the netpage p ⁇ nter exploits the growing availability of broadband Internet access Cable service is available to 95% of households m the Umted States, and cable modem service offe ⁇ ng broadband Internet access is already available to 20% of these
  • the netpage pnnter can also operate with slower connections, but with longer delivery times and lower image quality Indeed, the netpage system can be enabled usmg existing consumer inkjet and laser p ⁇ nters, although the system will operate more slowly and will therefore be less acceptable from a consumer's pomt of view
  • the netpage system is hosted on a pnvate intranet
  • the netpage system is hosted on a smgle computer or computer-enabled device, such as a pnnter
  • Netpage publication servers 14 on the netpage network are configured to deliver print-quality publications to netpage pnnters
  • Penodical publications are delivered automatically to subscnbmg netpage pnnters via pointcasting and multicasting Internet protocols
  • Personalized publications are filtered and formatted according to mdividual user profiles
  • a netpage pnnter can be configured to support any number of pens, and a pen can work with any number of netpage pnnters
  • each netpage pen has a umque identifier
  • a household may have a collection of colored netpage pens, one assigned to each member of the family This allows each user to maintain a distinct profile with respect to a netpage publication server or application server
  • a netpage pen can also be registered with a netpage registration server 11 and linked to one or more payment card accounts This allows e-commerce payments to be securely autho ⁇ zed using the netpage pen
  • the netpage registration server compares the signature captured by the netpage pen with a previously registered signature, allowing it to authenticate the user's identity to an e-commerce server
  • Other biomet ⁇ cs can also be used to venfy identity
  • a version of the netpage pen m cludes fingerprint scanning, venfied m a similar way by the netpage registration server
  • netpage p ⁇ nter may deliver penodicals such as the morning newspaper without user intervention, it can be configured never to deliver unsolicited junk mail In its preferred form, it only delivers penodicals from subsc ⁇ bed or otherwise authorized sources In this respect, the netpage pnnter is unlike a fax machine or e-mail - 7 - account which is visible to any junk mailer who knows the telephone number or email address
  • UML Unified Modelmg Language
  • a class diagram consists of a set of object classes connected by relationships, and two lands of relationships are of mterest here associations and generalizations An association represents some land of relationship between objects, I e between mstances of classes A generalization relates actual classes, and can be understood m the followmg way if a class is thought of as the set of all objects of that class, and class A is a generalization of class B, then B is simply a subset of A
  • the UML does not directly support second-order modelling - 1 e classes of classes
  • Each class is drawn as a rectangle labelled with the name of the class It contains a list of the attributes of the class, separated from the name by a horizontal lme, and a list of the operations of the class, separated from the attnbute list by a horizontal lme In the class diagrams which follow, however, operations are never modelled
  • association is drawn as a lme joining two classes, optionally labelled at either end with the multiplicity of the association
  • the default multiplicity is one
  • Each association is optionally labelled with its name, and is also optionally labelled at either end with the role of the co ⁇ esponding class
  • An open diamond mdicates an aggregation association ('is-part-of'), and is drawn at the aggregator end of the association lme
  • a generalization relationship ('is-a") is drawn as a solid lme joining two classes, with an anow (m the form of an open t ⁇ angle) at the generalization end
  • any class which is duplicated is shown with a dashed outline m all but the mam diagram which defines it It is shown with att ⁇ butes only where it is defined 1.1 NETPAGES
  • Netpages are the foundation on which a netpage network is built They provide a paper-based user interface to published information and mteractive services
  • a netpage consists of a p ⁇ nted page (or other surface region) invisibly tagged with references to an online descnption of the page
  • the online page descnption is maintained persistently by a netpage page server
  • the page descnption descnbes the visible layout and content of the page, mcludmg text, graphics and images It also descnbes the mput elements on the page, mcludmg buttons, hyperlinks, and mput fields
  • a netpage allows markings made with a netpage pen on its surface to be simultaneously captured and processed by the netpage system
  • each netpage is assigned a umque page identifier This page ID has sufficient precision to distinguish between a very large number of netpages
  • Each reference to the page descnption is encoded m a pnnted tag
  • the tag identifies the unique page on which it appears, and thereby indirectly identifies the page descnption
  • the tag also identifies its own position on the page Charactenstics of the tags are desc ⁇ bed m more detail below
  • Tags are p ⁇ nted m infrared-absorptive ink on any substrate which is infrared-reflective, such as ordinary paper Near-infrared wavelengths are invisible to the human eye but are easily sensed by a solid-state image sensor with an appropnate filter
  • a tag is sensed by an area image sensor m the netpage pen, and the tag data is transmitted to the netpage system via the nearest netpage p ⁇ nter
  • the pen is wireless and communicates with the netpage pnnter via a short-range radio link
  • Tags are sufficiently small and densely arranged that the pen can reliably image at least one tag even on a smgle click on the page It is important that the pen recognize the page ID and position on every interaction with the - 8 - page, smce the mteraction is stateless Tags are error-conectably encoded to make them partially tolerant to surface damage
  • the netpage page server maintains a umque page mstance for each p ⁇ nted netpage, allowing it to maintain a distinct set of user-supplied values for mput fields m the page descnption for each p ⁇ nted netpage
  • the relationship between the page descnption, the page mstance, and the pnnted netpage is shown in
  • each tag identifies the region m which it appears, and the location of that tag withm the region
  • a tag may also contain flags which relate to the region as a whole or to the tag
  • One or more flag bits may, for example, signal a tag sensmg device to provide feedback mdicative of a function associated with the immediate area of the tag, without the sensmg device havmg to refer to a desc ⁇ ption of the region
  • a netpage pen may, for example, illuminate an "active area" LED when m the zone of a hyperlink
  • each tag contains an easily recognized mvanant structure which aids initial detection, and which assists m minimizing the effect of any warp mduced by the surface or by the sensmg process
  • the tags preferably tile the entire page, and are sufficiently small and densely ananged that the pen can reliably image at least one tag even on a smgle click on the page It is important that the pen recognize the
  • Each tag contains 120 bits of information, typically allocated as shown m Table 1 Assuming a maximum tag density of 64 per square mch, a 16-bit tag ID supports a region size of up to 1024 square mches Larger regions can be mapped continuously without increasing the tag ID precision simply by usmg abutting regions and maps The 100-bit region ID allows 2 100 (— 10 30 or a million tnlhon tnllion) different regions to be uniquely identified 1.2.2 Tag Data Encoding
  • the 120 bits of tag data are redundantly encoded usmg a (15, 5) Reed-Solomon code This yields 360 encoded bits consisting of 6 codewords of 15 4-bit symbols each
  • the (15, 5) code allows up to 5 symbol enors to be conected per codeword, l e it is tolerant of a symbol enor rate of up to 33% per codeword
  • Each 4-bit symbol is represented in a spatially coherent way m the tag, and the symbols of the six - 9 - codewords are mterleaved spatially withm the tag This ensures that a burst enor (an enor affecting multiple spatially adjacent bits) damages a minimum number of symbols overall and a minimum number of symbols m any one codeword, thus maximising the likelihood that the burst enor can be fully conected
  • the physical representation of the tag shown m Figure 5, mcludes fixed target structures 15, 16, 17 and vanable data areas 18
  • the fixed target structures allow a sensmg device such as the netpage pen to detect the tag and infer its three-dimensional onentation relative to the sensor
  • the data areas contain representations of the mdividual bits of the encoded tag data
  • the tag is rendered at a resolution of 256x256 dots When p ⁇ nted at 1600 dots per mch this yields a tag with a diameter of about 4 mm At this resolution the tag is designed to be surrounded by a "quiet area" of radius 16 dots Since the quiet area is also contnubbed by adjacent tags, it only adds 16 dots to the effective diameter of the tag
  • the tag m cludes six target structures
  • a detection ring 15 allows the sensmg device to initially detect the tag
  • the ⁇ ng is easy to detect because it is rotationally mvanant and because a simple conection of its aspect ratio removes most of the effects of perspective distortion
  • An onentation axis 16 allows the sensmg device to determine the approximate planar onentation of the tag due to the yaw of the sensor
  • the onentation axis is skewed to yield a umque onentation
  • Four perspective targets 17 allow the sensmg device to infer an accurate two-dimensional perspective transform of the tag and hence an accurate three-dimensional position and onentation of the tag relative to the sensor
  • each data bit is represented by a radial wedge m the form of an area bounded by two radial lmes and two concentnc circular arcs
  • Each wedge has a minimum dimension of 8 dots at 1600 dpi and is designed so that its base (its inner arc), is at least equal to this minimum dimension
  • the height of the wedge m the radial direction is always equal to the minimum dimension
  • Each 4-bit data symbol is represented by an anay of 2x2 wedges
  • the 15 4-bit data symbols of each of the six codewords are allocated to the four concentnc symbol rings 18a to 18d m mterleaved fashion Symbols are allocated alternately m circular progression around the tag
  • the sensmg device In order to support "single-click" mteraction with a tagged region via a sensmg device, the sensmg device must be able to see at least one entire tag m its field of view no matter where m the region or at what onentation it is positioned
  • the required diameter of the field of view of the sensmg device is therefore a function of the size and spacmg of the tags Assuming a circular tag shape, the minimum diameter of the sensor field of view is obtained when the tags are tiled on a equilateral tnangular gnd, as shown m Figure 6
  • Figure 7 While a captured image is bemg acquired from the image sensor, the dynamic range of the image is determined (at 20) The center of the range is then chosen as the binary threshold for the image 21 The image is then thresholded and segmented mto connected pixel regions (I e shapes 23) (at 22) Shapes which are too small to represent - 10 - tag target structures are discarded The size and centroid of each shape is also computed
  • Binary shape moments 25 are then computed (at 24) for each shape, and these provide the basis for subsequently locating target structures
  • Central shape moments are by their nature mvanant of position, and can be easily made mvanant of scale, aspect ratio and rotation
  • the nng target structure 15 is the first to be located (at 26)
  • a ⁇ ng has the advantage of bemg very well behaved when perspective-distorted Matching proceeds by aspect-normalizing and rotation-normalizing each shape's moments Once its second-order moments are normalized the ⁇ ng is easy to recognize even if the perspective distortion was significant
  • the nng's onginal aspect and rotation 27 together provide a useful approximation of the perspective transform
  • the axis target structure 16 is the next to be located (at 28)
  • Matching proceeds by applymg the nng's normalizations to each shape's moments, and rotation-normalizing the resulting moments Once its second-order moments are normalized the axis target is easily recognized Note that one third order moment is required to disambiguate the
  • the four perspective target structures 17 are the last to be located (at 30) Good estimates of their positions are computed based on their known spatial relationships to the ⁇ ng and axis targets, the aspect and rotation of the nng, and the rotation of the axis Matching proceeds by applymg the nng's normalizations to each shape's moments Once their second-order moments are normalized the circular perspective targets are easy to recognize, and the target closest to each estimated position is taken as a match
  • the ongmal centroids of the four perspective targets are then taken to be the perspective-distorted comers 31 of a square of known size m tag space, and an eight-degree-of-freedom perspective transform 33 is infened (at 32) based on solving the well-understood equations relating the four tag-space and image- space pomt pairs (see Heckbert, P , Fundamentals of Texture Mappmg and Image Warping, Masters Thesis, Dept of EECS, U of California at Berkeley, Technical Report No UCB/CSD 89/516,
  • the infened tag-space to image-space perspective transform is used to project (at 36) each known data bit position m tag space mto image space where the real-valued position is used to bilinearly interpolate (at 36) the four relevant adjacent pixels m the mput image
  • the previously computed image threshold 21 is used to threshold the result to produce the final bit value 37
  • each of the six 60-bit Reed-Solomon codewords is decoded (at 38) to yield 20 decoded bits 39, or 120 decoded bits m total Note that the codeword symbols are sampled m codeword order, so that codewords are implicitly de-interleaved dunng the sampling process
  • the nng target 15 is only sought m a subarea of the image whose relationship to the image guarantees that the nng, if found, is part of a complete tag If a complete tag is not found and successfully decoded, then no pen position is recorded for the cu ⁇ ent frame Given adequate processmg power and ideally a non-minimal field of view 193, an alternative strategy mvolves seeking another tag m the cu ⁇ ent image
  • the obtained tag data mdicates the identity of the region containing the tag and the position of the tag within the region
  • An accurate position 35 of the pen nib m the region, as well as the overall onentation 35 of the pen, is then infened (at 34) from the perspective transform 33 observed on the tag and the known spatial relationship between the pen's physical axis and the pen's optical axis - 11 -
  • Decoding a tag results m a region ID, a tag ID, and a tag-relative pen transform
  • a tag map a function which maps each tag ID m a tagged region to a conespondmg location
  • the tag map class diagram is shown m Figure 22, as part of the netpage p ⁇ nter class diagram
  • a tag map reflects the scheme used to tile the surface region with tags, and this can vary accordmg to surface type When multiple tagged regions share the same tiling scheme and the same tag numbering scheme, they can also share the same tag map
  • the tag map for a region must be retnevable via the region ID
  • the tag map can be retneved
  • the tag ID can be translated mto an absolute tag location withm the region
  • the tag-relative pen location can be added to the tag location to yield an absolute pen location withm the region
  • a location-indicating tag contains a tag ID which, when translated through the tag map associated with the tagged region, yields a umque tag location withm the region The tag-relative location of the pen is added to this tag location to yield the location of the pen withm the region This m turn is used to determine the location of the pen relative to a user interface element m the page descnption associated with the region Not only is the user interface element itself identified, but a location relative to the user interface element is identified Location-indicating tags therefore tnvially support the capture of an absolute pen path m the zone of a particular user interface element
  • An object-indicating tag contains a tag ID which directly identifies a user interface element m the page descnption associated with the region All the tags m the zone of the user interface element identify the user interface element, making them all identical and therefore indistinguishable Object-indicating tags do not, therefore, support the capture of an absolute pen path They do, however, support the capture of a relative pen path So long as the position sampling frequency exceeds twice the encountered tag frequency, the displacement from one sampled pen position to the next within a stroke can be unambiguously determined
  • the tags function m cooperation with associated visual elements on the netpage as user mteractive elements m that a user can mteract with the pnnted page usmg an appropnate sensmg device m order for tag data to be read by the sensmg device and for an appropnate response to be generated m the netpage system 1.3 DOCUMENT AND PAGE DESCRIPTIONS
  • a document is descnbed at three levels At the most abstract level the document 836 has a hierarchical structure whose terminal elements 839 are associated with content objects 840 such as text objects, text style objects, image objects, etc
  • content objects 840 such as text objects, text style objects, image objects, etc
  • the document is paginated and otherwise formatted Formatted terminal elements 835 will m some cases be associated with content objects which are different from those associated with their conespondmg terminal elements, particularly where the content objects are style-related
  • Each pnnted mstance of a document and page is also descnbed separately, to allow mput captured through a particular page mstance 830 to be recorded separately from mput captured through other mstances of the same page descnption
  • the presence of the most abstract document descnption on the page server allows a user to request a copy of - 12 - a document without bemg forced to accept the source document's specific format
  • the user may be requesting a copy through a pnnter with a different page size, for example
  • the presence of the formatted document descnption on the page server allows the page server to efficiently interpret user actions on a particular p ⁇ nted page
  • a formatted document 834 consists of a set of formatted page descnptions 5, each of which consists of a set of formatted terminal elements 835
  • Each formatted element has a spatial extent or zone 58 on the page This defines the active area of mput elements such as hyperlinks and mput fields
  • a document mstance 831 conesponds to a formatted document 834 It consists of a set of page mstances
  • Each page mstance 830 descnbes a smgle umque pnnted netpage 1 , and records the page ID 50 of the netpage
  • a page mstance is not part of a document mstance if it represents a copy of a page requested m isolation
  • a page mstance consists of a set of terminal element mstances 832 An element mstance only exists if it records mstance-specific mformation Thus, a hyperlink mstance exists for a hyperlink element because it records a transaction ID 55 which is specific to the page mstance, and a field mstance exists for a field element because it records mput specific to the page mstance An element mstance does not exist, however, for static elements such as textflows
  • a terminal element can be a static element 843, a hyperlink element 844, a field element 845 or a page server command element 846, as shown m Figure 27
  • a static element 843 can be a style element 847 with an associated style object 854, a textflow element 848 with an associated styled text object 855, an image element 849 with an associated image element 856, a graphic element 850 with an associated graphic object 857, a video clip element 851 with an associated video clip object 858, an audio clip element 852 with an associated audio clip object 8
  • a page mstance has a background field 833 which is used to record any digital ink captured on the page which does not apply to a specific mput element
  • a tag map 811 is associated with each page mstance to allow tags on the page to be translated mto locations on the page 1.4 THE NETPAGE NETWORK
  • a netpage network consists of a dist ⁇ ubbed set of netpage page servers 10, netpage registration servers 11, netpage ID servers 12, netpage application servers 13, netpage publication servers 14, and netpage p ⁇ nters 601 connected via a network 19 such as the Internet, as shown m Figure 3
  • the netpage registration server 11 is a server which records relationships between users, pens, pnnters, applications and publications, and thereby authorizes vanous network activities It authenticates users and acts as a signing proxy on behalf of authenticated users in application transactions It also provides handwnting recognition services As descnbed above, a netpage page server 10 maintains persistent information about page descnptions and page mstances The netpage network mcludes any number of page servers, each handling a subset of page mstances
  • Smce a page server also maintains user mput values for each page mstance, clients such as netpage p ⁇ nters send netpage mput directly to the appropnate page server The page server interprets any such mput relative to the descnption of the conespondmg page
  • a netpage ID server 12 allocates document IDs 51 on demand, and provides load-balancing of page servers via its ID allocation scheme
  • a netpage pnnter uses the Internet Distn Published Name System (DNS), or similar, to resolve a netpage page ID 50 mto the network address of the netpage page server handling the conespondmg page mstance
  • DNS Internet Distn Published Name System
  • a netpage application server 13 is a server which hosts mteractive netpage applications
  • a netpage - 13 - pubhcation server 14 is an application server which publishes netpage documents to netpage pnnters They are descnbed m detail m Section 2
  • Netpage servers can be hosted on a va ⁇ ety of network server platforms from manufacturers such as IBM,
  • Hewlett-Packard, and Sun Multiple netpage servers can run concurrently on a smgle host, and a smgle server can be distnaded over a number of hosts
  • Some or all of the functionality provided by netpage servers, and m particular the functionality provided by the ID server and the page server, can also be provided directly m a netpage appliance such as a netpage pnnter, m a computer workstation, or on a local network
  • the netpage p ⁇ nter 601 is an appliance which is registered with the netpage system and pnnts netpage documents on demand and via subscnption
  • Each pnnter has a umque p ⁇ nter ID 62, and is connected to the netpage network via a network such as the Internet, ideally via a broadband connection
  • the netpage pnnter contains no persistent storage
  • the network is the computer
  • Netpages function interactively across space and time with the help of the distnubbed netpage page servers 10, independently of particular netpage pnnters
  • the netpage pnnter receives subscnbed netpage documents from netpage publication servers 14
  • Each document is distnaded m two parts the page layouts, and the actual text and image objects which populate the pages
  • page layouts are typically specific to a particular subscnber and so are pomtcast to the subscnber's pnnter via the appropnate page server Text and image objects, on the other hand, are typically shared with other subscnbers, and so are multicast to all subscnbers' pnnters and the appropnate page servers
  • the netpage publication server optimizes the segmentation of document content mto pointcasts and multicasts After receiving the pomtcast of a document's page layouts, the pnnter knows which multicasts, if any, to listen to
  • the pnnter Once the pnnter has received the complete page layouts and objects that define the document to be pnnted, it can p ⁇ nt the document
  • the p ⁇ nter raste ⁇ zes and pnnts odd and even pages simultaneously on both sides of the sheet It contains duplexed p ⁇ nt engme controllers 760 and pnnt engmes utilizing MemjetTM printheads 350 for this purpose
  • the pnnting process consists of two decoupled stages rasterization of page descnptions, and expansion and pnnting of page images
  • the raster image processor (RIP) consists of one or more standard DSPs 757 running m parallel
  • duplexed pnnt engme controllers consist of custom processors which expand, dither and p ⁇ nt page images in real time, synchronized with the operation of the printheads m the p ⁇ nt engmes
  • Pnnters not enabled for IR pnnting have the option to pnnt tags usmg IR-absorptive black ink, although this restncts tags to otherwise empty areas of the page Although such pages have more limited functionality than IR-pnnted pages, they are still classed as netpages
  • a normal netpage pnnter pnnts netpages on sheets of paper More specialised netpage pnnters may p ⁇ nt onto more specialised surfaces, such as globes
  • Each pnnter supports at least one surface type, and supports at least one tag tilmg scheme, and hence tag map, for each surface type
  • the tag map 811 which descnbes the tag tilmg scheme actually used to pnnt a document becomes associated with that document so that the document's tags can be conectly interpreted
  • Figure 2 shows the netpage pnnter class diagram, reflecting printer-related mformation maintained by a registration server 11 on the netpage network
  • a prefened embodiment of the netpage p ⁇ nter is descnbed in greater detail m Section 6 below, with - 14 - ref erence to Figures 11 to 16
  • the netpage system can operate usmg p ⁇ nters made with a wide range of digital pnnting technologies, mcludmg thermal inkjet, piezoelectnc Inkjet, laser electrophotographic, and others However, for wide consumer acceptance, it is desirable that a netpage pnnter have the followmg charactenstics
  • MemjetTM is a drop-on-demand inkjet technology that mcorporates pagewidth printheads fabncated usmg microelectromechamcal systems (MEMS) technology
  • Figure 17 shows a smgle p ⁇ nting element 300 of a MemjetTM pnnthead
  • the netpage wallpnnter mcorporates 168960 p ⁇ nting elements 300 to form a 1600 dpi pagewidth duplex pnnter
  • This pnnter simultaneously pnnts cyan, magenta, yellow, black, and infrared inks as well as paper conditioner and ink fixative
  • the pnnting element 300 is approximately 110 microns long by 32 microns wide Anays of these pnnting elements are formed on a silicon substrate 301 that mcorporates CMOS logic
  • Major elements of the pnnting element 300 are the nozzle 302, the nozzle nm 303, the nozzle chamber 304, the fluidic seal 305, the ink channel nm 306, the lever arm 307, the active actuator beam pa r 308, the passive actuator beam pair 309, the active actuator anchor 310, the passive actuator anchor 311, and the ink inlet 312
  • the active actuator beam pair 308 is mechanically joined to the passive actuator beam pair 309 at the jom 319 Both beams pars are anchored at their respective anchor points 310 and 311
  • the combination of elements 308, 309, 310, 311, and 319 form a cantilevered electrothermal bend actuator 320
  • Figure 18 shows a small part of an anay of pnnting elements 300, mcludmg a cross section 315 of a pnnting element 300
  • the cross section 315 is shown without mk, to clearly show the ink inlet 312 that passes through the silicon wafer 301
  • Figures 19(a), 1 (b) and 19(c) show the operating cycle of a MemjetTM pnnting element 300
  • Figure 19(a) shows the quiescent position of the ink memscus 316 pnor to p ⁇ nting an ink droplet Ink is retained m the nozzle chamber by surface tension at the ink memscus 316 and at the fluidic seal 305 formed between the nozzle chamber 304 and the ink channel nm 306
  • the pnnthead CMOS circuitry distnbutes data from the p ⁇ nt engme controller to the conect - 15 - pnntmg element, latches the data, and buffers the data to dnve the electrodes 318 of the active actuator beam pair 308
  • the nozzle nm 303 prevents the ink memscus 316 from spreading across the surface of the nozzle chamber 304 As the temperature of the beam pairs 308 and 309 equalizes, the actuator 320 returns to its ongmal position This aids m the break-off of the ink droplet 317 from the ink 321 m the nozzle chamber, as shown m Figure 1 (c) The nozzle chamber is refilled by the action of the surface tension at the memscus 316
  • Figure 20 shows a segment of a pnnthead 350 In a netpage pnnter, the length of the pnnthead is the full width of the paper (typically 210 mm) in the direction 351 The segment shown is 04 mm long (about 02% of a complete pnnthead) When pnnting, the paper is moved past the fixed pnnthead m the direction 352 The pnnthead has 6 rows of interdigitated pnnting elements 300, pnnting the six colors or types of mk supplied by the ink inlets 312
  • a nozzle guard wafer 330 is attached to the pnnthead substrate 301
  • a conespondmg nozzle guard hole 331 through which the ink droplets are fired
  • filtered air is pumped through the air inlets 332 and out of the nozzle guard holes du ⁇ ng p ⁇ nting
  • the nozzle guard is sealed while the pnnter is idle 1.6
  • the active sensmg device of the netpage system is typically a pen 101, which, usmg its embedded controller 134, is able to capture and decode IR position tags from a page via an image sensor
  • the image sensor is a solid-state device provided with an appropnate filter to permit sensmg at only near-infrared wavelengths
  • the system is able to sense when the nib is m contact with the surface, and the pen is able to sense tags at a sufficient rate to capture human handwnting (l e at 200 dpi or greater and 100 Hz or faster)
  • Information captured by the pen is encrypted and wirelessly transmitted to the pnnter (or base station), the pnnter or base station interpreting the data with respect to the (known) page structure
  • the prefened embodiment of the netpage pen operates both as a normal marking ink pen and as a non- marking stylus The marking aspect, however, is not necessary for usmg the netpage system as a browsing system, such as when it is used as
  • Each netpage pen has a current selection 826 associated with it, allowing the user to perform copy and paste operations etc
  • the selection is timestamped to allow the system to discard it after a defined time penod
  • the current selection descnbes a region of a page mstance It consists of the most recent digital ink stroke captured through the pen relative to the background area of the page It is interpreted m an application-specific manner once it is submitted to an application via a selection hyperlink activation
  • Each pen has a current mb 824 This is the mb last notified by the pen to the system In the case of the default netpage pen descnbed above, either the marking black ink mb or the non-marking stylus mb is current Each pen also has a current mb style 825 This is the mb style last associated with the pen by an application, e g m response to the user selecting a color from a palette
  • the default mb style is the mb style associated with the cu ⁇ ent mb Strokes captured through a pen are tagged with the current mb style When the strokes are subsequently reproduced, they are reproduced m the mb style with which they are tagged Whenever the pen is withm range of a pnnter with which it can communicate, the pen slowly flashes its
  • a sequence of captured strokes is refened to as digital ink
  • Digital ink forms the basis for the digital exchange of drawings and handwnting, for online recognition of handw ⁇ ting, and for online venfication of signatures
  • the pen is wireless and transmits digital ink to the netpage pnnter via a short-range radio link
  • the transmitted digital ink is encrypted for pnvacy and secunty and packetized for efficient transmission, but is always flushed on a pen-up event to ensure timely handling m the p ⁇ nter
  • the pen When the pen is out-of-range of a pnnter it buffers digital ink m internal memory, which has a capacity of over ten minutes of continuous handwnting When the pen is once again withm range of a pnnter, it transfers any buffered digital ink
  • a pen can be registered with any number of pnnters, but because all state data resides m netpages both on paper and on the network, it is largely immatenal which pnnter a pen is communicating with at any particular time
  • a prefened embodiment of the pen is descnbed m greater detail m Section 6 below, with reference to Figures 8 to 10 1.7 NETPAGE INTERACTION
  • the netpage pnnter 601 receives data relating to a stroke from the pen 101 when the pen is used to interact with a netpage 1
  • the coded data 3 of the tags 4 is read by the pen when it is used to execute a movement, such as a stroke
  • the data allows the identity of the particular page and associated mteractive element to be determined and an indication of the relative positioning of the pen relative to the page to be obtained
  • the indicating data is transmitted to the p ⁇ nter, where it resolves, via the DNS, the page ID 50 of the stroke mto the network address of the netpage page server 10 which maintains the conespondmg page mstance 830 It then transmits the stroke to the page server If the - 17 - page was recently identified m an earlier stroke, then the pnnter may aheady have the address of the relevant page server m its cache
  • Each netpage consists of a compact page layout maintained persistently by a netpage page server (see below)
  • the page layout refers to objects such as images,
  • a “click” is a stroke where the distance and time between the pen down position and the subsequent pen up position are both less than some small maximum
  • An object which is activated by a click typically requires a click to be activated, and accordingly, a longer stroke is ignored
  • the failure of a pen action, such as a "sloppy" click, to register is mdicated by the lack of response from the pen's "ok” LED
  • a hyperlink is a means of sendmg a message to a remote application, and typically elicits a p ⁇ nted response m the netpage system
  • a hyperlink element 844 identifies the application 71 which handles activation of the hyperlink, a link ID
  • the page server When a hyperlink is activated, the page server sends a request to an application somewhere on the network
  • the application is identified by an application ID 64, and the application ID is resolved m the normal way via the DNS
  • a general hyperlink can implement a request for a linked document, or may simply signal a preference to a server
  • a form hyperlink submits the conespondmg form to the application
  • a selection hyperlink submits the cu ⁇ ent selection to the application If the current selection contains a smgle-word piece of text, for example, the application may return a smgle-page document giving the word's meaning withm the context m which it appears, or a translation mto a different language
  • Each hyperlink type is characterized by what information is submitted to the application
  • the conespondmg hyperlink mstance 862 records a transaction ID 55 which can be specific to the page mstance on which the hyperlink mstance appears
  • the transaction ID can identify user-specific data to the application, for example a "shopping cart" of pending purchases maintained by a purchasing application on behalf of the user
  • the system m cludes the pen's current selection 826 m a selection hyperlink activation
  • the system m cludes the content of the associated form mstance 868 m a form hyperlink activation, although if the hyperlink has its "submit delta" att ⁇ bute set, only mput smce the last form submission is mcluded
  • the system m cludes an effective return path m all hyperlink activations
  • a hyperhnked group 866 is a group element 838 which has an associated hyperlink, as shown m Figure 31
  • a hyperlinked group can be used to associate hyperlink behavior with a field such as a checkbox It can also be used, m conjunction with the "submit delta" attnbute of a form hyperlink, to provide continuous mput to an application It can therefore be used to support a "blackboard" mteraction model, l e where mput is captured and therefore shared as soon - 18 - as it occurs
  • a form defines a collection of related mput fields used to capture a related set of mputs through a pnnted netpage
  • a form allows a user to submit one or more parameters to an application software program running on a server
  • a form 867 is a group element 838 m the document hierarchy It ultimately contains a set of terminal field elements 839
  • a form mstance 868 represents a pnnted mstance of a form It consists of a set of field mstances 870 which conespond to the field elements 845 of the fo ⁇ n
  • Each field mstance has an associated value 871, whose type depends on the type of the conespondmg field element
  • Each field value records mput through a particular pnnted form mstance, l e through one or more pnnted netpages
  • the form class diagram is shown m Figure 32
  • Each form mstance has a status 872 which mdicates whether the form is active, frozen, submitted, void or
  • Each form mstance is associated (at 59) with any form mstances denved from it, thus providing a version history This allows all but the latest version of a form m a particular time penod to be excluded from a search All mput is captured as digital ink Digital ink 873 consists of a set of timestamped stroke groups 874, each of which consists of a set of styled strokes 875 Each stroke consists of a set of timestamped pen positions 876, each of which also mcludes pen onentation and mb force The digital ink class diagram is shown m Figure 33
  • a field element 845 can be a checkbox field 877, a text field 878, a drawing field 879, or a signature field 880
  • the field element class diagram is shown m Figure 34 Any digital ink captured m a field's zone 58 is assigned to the field
  • a checkbox field has an associated boolean value 881, as shown m Figure 35 Any mark (a tick, a cross, a stroke, a fill zigzag, etc ) captured m a checkbox field's zone causes a true value to be assigned to the field's value
  • a text field has an associated text value 882, as shown m Figure 36
  • Any digital ink captured m a text field's zone is automatically converted to text via online handw ⁇ ting recognition, and the text is assigned to the field's value Online handwnting recognition is well-understood (see, for example, Tappert, C , C Y Suen and T Wakahara,
  • a signature field has an associated digital signature value 883, as shown m Figure 37 Any digital ink captured m a signature field's zone is automatically venfied with respect to the identity of the owner of the pen, and a digital signature of the content of the form of which the field is part is generated and assigned to the field's value
  • the digital signature is generated usmg the pen user's pnvate signature key specific to the application which owns the form Online signature venfication is well-understood (see, for example, Plamondon, R and G Lorette, "Automatic Signature Venfication and W ⁇ ter Identification - The State of the Art", Pattern Recognition, Vol 22, No 2, 1989, the contents of which are herem incorporated by cross-reference)
  • a field element is hidden if its "hidden” attnbute is set
  • a hidden field element does not have an mput zone on a page and does not accept mput It can have an associated field value which is mcluded m the form data when the - 19 - form
  • Editing commands such as st ⁇ ke-throughs indicating deletion, can also be recognized m form fields
  • Digital ink as already stated, consists of a sequence of strokes Any stroke which starts m a particular element's zone is appended to that element's digital ink stream, ready for mterpretation Any stroke not appended to an object's digital ink stream is appended to the background field's digital ink stream
  • Digital ink captured m the background field is mterpreted as a selection gesture
  • Cncumscnption of one or more objects is generally mterpreted as a selection of the circumscnbed objects, although the actual mterpretation is application-specific
  • the system maintains a current selection for each pen
  • the selection consists simply of the most recent stroke captured m the background field
  • the selection is cleared after an inactivity timeout to ensure predictable behavior
  • the raw digital ink captured m every field is retained on the netpage page server and is optionally transmitted with the form data when the form is submitted to the application
  • This allows the application to mtenogate the raw digital ink should it suspect the onginal conversion, such as the conversion of handwntten text
  • This can, for example, mvolve human intervention at the application level for forms which fail certain application-specific consistency checks
  • the entire background area of a form can be designated as a drawing field
  • the application can then decide, on the basis of the presence of digital ink outside the explicit fields of the form, to route the form to a human operator, on the assumption that the user may have indicated amendments to the filled-in fields outside of those fields
  • Figure 38 shows a flowchart of the process of handling pen mput relative to a netpage
  • the process consists of receiving (at 884) a stroke from the pen, identifying (at 885) the page mstance 830 to which the page ID 50 in the stroke refers, retnevmg (at 886) the page descnption 5, identifying (at 887) a formatted element 839 whose zone 58 the - 20 - stroke mtersects, determining (at 888) whether the formatted element conesponds to a field element, and if so appendmg (at 892) the received stroke to the digital ink of the field value 871, mterpretmg (at 893) the accumulated digital ink of the field, and determining (at 894) whether the field is part of a hyperlinked group 866 and if so activating
  • Figure 38a shows a detailed flowchart of step 893 m the process shown m Figure 38, where the accumulated digital ink of a field is mterpreted accordmg to the type of the field
  • the process consists of determinmg (at 896) whether the field is a checkbox and (at 897) whether the digital ink represents a checkmark, and if so assigning (at 898) a true value to the field value, alternatively determinmg (at 899) whether the field is a text field and if so converting (at 900) the digital ink to computer text, with the help of the appropnate registration server, and assigning (at 901) the converted computer text to the field value, alternatively determinmg (at 902) whether the field is a signature field and if so venfymg (at 903) the digital ink as the signature of the pen's owner, with the help of the appropnate registration server, creating (at 904) a digital signature of the contents of the conespond
  • a page server command is a command which is handled locally by the page server It operates directly on form, page and document mstances
  • a page server command 907 can be a void form command 908, a duplicate form command 909, a reset form command 910, a get form status command 911, a duplicate page command 912, a reset page command 913, a get page status command 914, a duplicate document command 915, a reset document command 916, or a get document status command 917, as shown m Figure 39
  • a void form command voids the conespondmg form mstance
  • a duplicate form command voids the conespondmg form mstance and then produces an active pnnted copy of the current form mstance with field values preserved The copy contains the same hyperlink transaction IDs as the onginal, and so is indistinguishable from the ongmal to an application
  • a reset form command voids the conespondmg form mstance and then produces an active prmted copy of the form mstance with field values discarded
  • a get form status command produces a pnnted report on the status of the conespondmg
  • a duplicate page command produces a pnnted copy of the conespondmg page instance with the background field value preserved If the page contains a form or is part of a form, then the duplicate page command is mterpreted as a duplicate form command
  • a reset page command produces a pnnted copy of the conespondmg page mstance with the background field value discarded If the page contains a form or is part of a form, then the reset page command is mterpreted as a reset form command
  • a get page status command produces a p ⁇ nted report on the status of the conespondmg page mstance, mcludmg who published it, when it was p ⁇ nted, for whom it was pnnted, and the status of any forms it contains or is part of
  • the netpage logo which appears on every netpage is usually associated with a duplicate page element - 21 -
  • field values are pnnted m then native form, l e a checkmark appears as a standard checkmark graphic, and text appears as typeset text Only drawings and signatures appear m their ongmal form, with a signature accompanied by a standard graphic indicating successful signature venfication
  • a duplicate document command produces a p ⁇ nted copy of the conespondmg document mstance with background field values preserved If the document contams any forms, then the duplicate document command duplicates the forms m the same way a duplicate form command does
  • a reset document command produces a pnnted copy of the conespondmg document mstance with background field values discarded If the document contams any forms, then the reset document command resets the forms m the same way a reset form command does
  • a get document status command produces a pnnted report on the status of the conespondmg document mstance
  • the command operates on the page identified by the pen's current selection rather than on the page containing the command This allows a menu of page server commands to be pnnted If the target page doesn't contain a page server command element for the designated page server command, then the command is ignored
  • An application can provide application-specific handling by embeddmg the relevant page server command element m a hyperlinked group
  • the page server activates the hyperlink associated with the hyperlinked group rather than executing the page server command
  • a page server command element is hidden if its "hidden" attnbute is set
  • a hidden command element does not have an input zone on a page and so cannot be activated directly by a user It can, however, be activated via a page server command embedded in a different page, if that page server command has its "on selected" att ⁇ bute set
  • each netpage is pnnted with the netpage logo at the bottom to indicate that it is a netpage and therefore has mteractive properties
  • the logo also acts as a copy button In most cases pressing the logo produces a copy of the page In the case of a form, the button produces a copy of the entire form And m the case of a secure document, such as a ticket or coupon, the button elicits an explanatory note or advertising page
  • the netpage pnnter has a smgle button labelled "Help" When pressed it elicits a smgle page of information, mcludmg
  • the help menu provides a hierarchical manual on how to use the netpage system
  • the document function menu mcludes the followmg functions
  • a document function is initiated by simply pressmg the button and then touching any page of the document
  • the netpage network directory allows the user to navigate the hierarchy of publications and services on the network As an alternative, the user can call the netpage network "900" number "yellow pages” and speak to a human operator The operator can locate the desned document and route it to the user's pnnter Depending on the document type, the publisher or the user pays the small "yellow pages" service fee
  • the help page is obviously unavailable if the pnnter is unable to pnnt In this case the "enor" light is lit and the user can request remote diagnosis over the network 2 PERSONALIZED PUBLICATION MODEL
  • news is used as a canonical publication example to illustrate personalization mechanisms m the netpage system
  • news is often used m the limited sense of newspaper and newsmagazme news, the mtended scope m the present context is wider
  • the editonal content and the advertising content of a news publication are personalized usmg different mechamsms
  • the editonal content is personalized accordmg to the reader's explicitly stated and implicitly captured mterest profile
  • the advertising content is personalized according to the reader's locality and demographic 2.1 EDITORIAL PERSONALIZATION
  • a subscnber can draw on two lands of news sources those that deliver news publications, and those that deliver news streams While news publications are aggregated and edited by the publisher, news streams are aggregated either by a news publisher or by a specialized news aggregator News publications typicallv conespond to traditional newspapers and newsmagazines, while news streams can be many and vaned a "raw" news feed from a news service, a cartoon stnp, a freelance wnter's column, a friend's bulletin board, or the reader's own e-mail
  • the netpage publication server supports the publication of edited news publications as well as the aggregation of multiple news streams By handling the aggregation and hence the formatting of news streams selected directly by the reader, the server is able to place advertising on pages over which it otherwise has no editonal control
  • the subscnber builds a daily newspaper by selecting one or more contnbuting news publications, and creating a personalized version of each
  • the resulting daily editions are pnnted and bound together mto a smgle newspaper
  • the vanous members of a household typically express their different mterests and tastes by selecting different daily publications and then customizing them
  • the reader optionally specifies its size, either qualitatively (e g short, medium, or long), or numencally (I e as a limit on its number of pages), and the desired proportion of advertising, either qualitatively (e g high, normal, low, none), or nume ⁇ cally (l e as a percentage)
  • the reader also optionally expresses a preference for a large number of shorter articles or a small number of - 23 - longer articles Each article is ideally wntten (or edited) in both short and long forms to support this preference
  • An article may also be wntten (or edited) m different versions to match the expected sophistication of the reader, for example to provide children's and adults' versions
  • the appropnate version is selected accordmg to the reader's age
  • the reader can specify a "reading age” which takes precedence over then biological age
  • the articles which make up each section are selected and pnontized by the editors, and each is assigned a useful lifetime By default they are delivered to all relevant subscnbers, m pnonty order, subject to space constraints m the subscnbers' editions
  • the reader may optionally enable collaborative filtenng This is then applied to articles which have a sufficiently long lifetime
  • Each article which qualifies for collaborative filtenng is p ⁇ nted with ratmg buttons at the end of the article
  • the buttons can provide an easy choice (e g "liked” and “disliked'), making it more likely that readers will bother to rate the article
  • the reader optionally specifies a serendipity factor, either qualitatively (e g do or don't surpnse me), or numencally
  • a serendipity factor lowers the threshold used for matchmg du ⁇ ng collaborative filtenng
  • a high factor makes it more likely that the conespondmg section will be filled to the reader's specified capacity
  • a different serendipity factor can be specified for different days of the week
  • the reader also optionally specifies topics of particular mterest withm a section, and this modifies the pnonties assigned by the editors
  • the speed of the reader's Internet connection affects the quality at which images can be delivered
  • the reader optionally specifies a preference for fewer images or smaller images or both If the number or size of images is not reduced, then images may be delivered at lower quality (I e at lower resolution or with greater compression)
  • the reader specifies how quantities, dates, times and monetary values are localized This involves specifying whether units are impenal or metnc, a local trmezone and time format, and a local currency, and whether the localization consist of in situ translation or annotation These preferences are denved from the reader's locality by default
  • the reader optionally specifies a global preference for a larger presentation
  • Both text and images are scaled accordingly, and less mformation is accommodated on each page
  • the language m which a news publication is published, and its conespondmg text encoding, is a property of the publication and not a preference expressed by the user
  • the netpage system can be configured to provide automatic translation services m vanous guises
  • Effective advertising is placed on the basis of locality and demographics
  • Locality determines proximity to particular services, retailers etc , and particular interests and concerns associated with the local community and environment Demographics determine general interests and preoccupations as well as likely spending patterns
  • a news publisher's most profitable product is advertising "space", a multi-dimensional entity determined by - 24 - the publication's geographic coverage, the size of its readership, its readership demographics, and the page area available for advertismg
  • the netpage publication server computes the approximate multi-dimensional size of a publication's saleable advertismg space on a per-section basis, taking mto account the publication's geographic coverage, the section's readership, the size of each reader's section edition, each reader's advertismg proportion, and each reader's demographic
  • the netpage system allows the advertismg space to be defined m greater detail, and allows smaller pieces of it to be sold separately It therefore allows it to be sold at closer to its true value
  • the same advertismg "slot" can be sold m varying proportions to several advertisers, with mdividual readers' pages randomly receivmg the advertisement of one advertiser or another, overall preserving the proportion of space sold to each advertiser
  • an advertismg aggregator can provide arbitranly broad coverage of both geography and demographics
  • the subsequent disaggregation is efficient because it is automatic This makes it more cost-effective for publishers to deal with advertismg aggregators than to directly capture advertismg
  • the advertismg aggregator is taking a proportion of advertismg revenue, publishers may find the change profit-neutral because of the greater efficiency of aggregation
  • the advertising aggregator acts as an intermediary between advertisers and publishers, and may place the same advertisement m multiple publications
  • ad placement m a netpage publication can be more complex than ad placement m the publication's traditional counterpart, because the publication's advertismg space is more complex While ignoring the full complexities of negotiations between advertisers, advertismg aggregators and publishers, the prefened form of the netpage system provides some automated support for these negotiations, mcludmg support for automated auctions of advertismg space Automation is particularly desirable for the placement of advertisements which generate small amounts of mcome, such as small or highly localized advertisements
  • the aggregator captures and edits the advertisement and records it on a netpage ad server Conespondingly, the publisher records the ad placement on the relevant netpage publication server
  • the netpage publication server When the netpage publication server lays out each user's personalized publication, it picks the relevant advertisements from the netpage ad server
  • the customization of a publication is typically publication-specific, and so the customization mformation is maintained by the relevant netpage publication server
  • a collaborative filtenng vector consists of the user's ratings of a number of news items It is used to - 25 - conelate different users' mterests for the purposes of making recommendations
  • the localization of advertismg relies on the locality mdicated m the user's contact details, while the targeting of advertismg relies on personal information such as date of birth, gender, mantal status, income, profession, education, or qualitative denvatives such as age range and mcome range
  • advertismg For those users who choose to reveal personal information for advertismg purposes, the information is maintained by the relevant netpage registration server In the absence of such information, advertismg can be targeted on the basis of the demographic associated with the user's ZIP or ZIP+4 Code
  • Each user, pen, p ⁇ nter, application provider and application is assigned its own unique identifier, and the netpage registration server maintains the relationships between them, as shown m Figures 21, 22, 23 and 24
  • a publisher is a special land of application provider
  • a publication is a special land of application
  • Each user 800 may be authorized to use any number of p ⁇ nters 802, and each p ⁇ nter may allow any number of users to use it
  • Each user has a smgle default p ⁇ nter (at 66), to which penodical publications are delivered by default, whilst pages pnnted on demand are delivered to the p ⁇ nter through which the user is interacting
  • the server keeps track of which publishers a user has autho ⁇ zed to pnnt to the user's default p ⁇ nter
  • a publisher does not record the ID of any particular p ⁇ nter, but mstead resolves the ID when it is required
  • the publisher 806 When a user subscnbes 808 to a publication 807, the publisher 806 (l e application provider 803) is autho ⁇ zed to p ⁇ nt to a specified p ⁇ nter or the user's default pnnter This authorization can be revoked at any time by the user
  • Each user may have several pens 801, but a pen is specific to a smgle user If a user is autho ⁇ zed to use a particular pnnter, then that pnnter recognizes any of the user's pens
  • the pen ID is used to locate the conespondmg user profile maintained by a particular netpage registration server, via the DNS m the usual way
  • a Web terminal 809 can be authorized to pnnt on a particular netpage pnnter, allowing Web pages and netpage documents encountered dunng Web browsmg to be conveniently pnnted on the nearest netpage p ⁇ nter
  • the netpage system can collect, on behalf of a p ⁇ nter provider, fees and commissions on mcome earned through publications pnnted on the provider's pnnters Such mcome can mclude advertismg fees, click-through fees, e- commerce commissions, and transaction fees If the pnnter is owned by the user, then the user is the pnnter provider
  • Each user also has a netpage account 820 which is used to accumulate micro-debits and credits (such as those descnbed m the preceding paragraph), contact details 815, mcludmg name, address and telephone numbers, global preferences 816, mcludmg p ⁇ vacy, delivery and localization settings, any number of biometnc records 817, containing the user's encoded signature 818, fingerprint 819 etc, a handwnting model 819 automatically maintained by the system, and SET payment card accounts 821 with which e-commerce payments can be made - 26 - 2.3.2 Favorites List
  • a netpage user can maintain a list 922 of "favo ⁇ tes" - links to useful documents etc on the netpage network
  • the list is mamtamed by the system on the user's behalf It is organized as a hierarchy of folders 924, a prefemed embodiment of which is shown m the class diagram m Figure 41 2.3.3 History List
  • the system maintains a history list 929 on each user's behalf, containing links to documents etc accessed by the user through the netpage system It is organized as a date-ordered list, a prefened embodiment of which is shown m the class diagram m Figure 42
  • the netpage publication server automatically lays out the pages of each user's personalized publication on a section-by-section basis Smce most advertisements are m the form of pre-formatted rectangles, they are placed on the page before the editonal content
  • the advertismg ratio for a section can be achieved with wildly varying advertismg ratios on mdividual pages withm the section, and the ad layout algonthm exploits this
  • the algonthm is configured to attempt to co-locate closely tied editonal and advertismg content, such as plac g ads for roofing matenal specifically withm the publication because of a special feature on do-it-yourself roofing repairs
  • section size preference can, however, be matched on average over time, allowing significant day-to-day vanations
  • the primary efficiency mechanism is the separation of information specific to a smgle user's edition and information shared between multiple users' editions
  • the specific information consists of the page layout
  • the shared information consists of the objects to which the page layout refers, mcludmg images, graphics, and pieces of text
  • a text object contams fully-formatted text represented m the Extensible Markup Language (XML) usmg the Extensible Stylesheet Language (XSL) XSL provides precise control over text formatting mdependently of the region mto which the text is bemg set, which m this case is bemg provided by the layout
  • the text object contams embedded language codes to enable automatic translation, and embedded hyphenation hints to aid with paragraph formatting
  • An image object encodes an image m the JPEG 2000 wavelet-based compressed image format
  • a graphic object encodes a 2D graphic in Scalable Vector Graphics (SVG) format
  • the layout itself consists of a senes of placed image and graphic objects, linked textflow objects through which text objects flow, hyperlinks and mput fields as descnbed above, and watermark regions These layout objects are summarized m Table 3
  • the layout uses a compact format suitable for efficient distnbution and storage
  • the netpage publication server allocates, with the help of the netpage ID server 12, a unique ID for each page, page instance, document, and document instance.
  • the server computes a set of optimized subsets of the shared content and creates a multicast channel for each subset, and then tags each user-specific layout with the names of the multicast channels which will cany the shared content used by that layout.
  • the server then pointcasts each user's layouts to that user's printer via the appropriate page server, and when the pointcasting is complete, multicasts the shared content on the specified channels.
  • each page server and printer subscribes to the multicast channels specified in the page layouts.
  • each page server and printer extracts from the multicast streams those objects refened to by its page layouts.
  • the page servers persistently archive the received page layouts and shared content.
  • the printer re-creates the fully- populated layout and then rasterizes and prints it.
  • the printer prints pages faster than they can be delivered. Assuming a quarter of each page is covered with images, the average page has a size of less than 400KB. The printer can therefore hold in excess of 100 such pages in its internal 64MB memory, allowing for temporary buffers etc. The printer prints at a rate of one page per second. This is equivalent to 400KB or about 3Mbit of page data per second, which is similar to the highest expected rate of page data delivery over a broadband network.
  • the netpage publication server therefore allows printers to submit requests for re- multicasts. When a critical number of requests is received or a timeout occurs, the server re-multicasts the conespondmg shared objects.
  • a printer can produce an exact duplicate at any time by retrieving its page - 28 - layouts and contents from the relevant page server
  • a netpage formatting server is a special mstance of a netpage publication server
  • the netpage formatting server has knowledge of vanous Internet document formats, mcludmg Adobe's Portable Document Format (PDF), and Hypertext Markup Language (HTML)
  • PDF Adobe's Portable Document Format
  • HTML Hypertext Markup Language
  • HTML it can make use of the higher resolution of the p ⁇ nted page to present Web pages m a multi-column format, with a table of contents It can automatically mclude all Web pages directly linked to the requested page The user can tune this behavior via a preference
  • the netpage formatting server makes standard netpage behavior, mcludmg interactivity and persistence, available on any Internet document, no matter what its ongm and format It hides knowledge of different document formats from both the netpage p ⁇ nter and the netpage page server, and hides knowledge of the netpage system from Web servers 3 SECURITY
  • Cryptography is used to protect sensitive information, both m storage and m transit, and to authenticate parties to a transaction
  • the netpage network uses both classes of cryptography
  • Secret-key cryptography also refened to as symmetnc cryptography, uses the same key to encrypt and decrypt a message Two parties wishing to exchange messages must first anange to securely exchange the secret key
  • Public-key cryptography also refened to asymmetnc cryptography, uses two encryption keys
  • the two keys are mathematically related m such a way that any message encrypted usmg one key can only be decrypted usmg the other key
  • One of these keys is then published, while the other is kept pnvate
  • the public key is used to encrypt any message mtended for the holder of the pnvate key
  • Once encrypted usmg the public key a message can only be decrypted usmg the pnvate key
  • Public-key cryptography can be used to create a digital signature
  • the holder of the pnvate key can create a known hash of a message and then encrypt the hash usmg the pnvate key
  • anyone can then venfy that the encrypted hash constitutes the "signature" of
  • a certificate authonty is a trusted third party which authenticates the connection between a public key and someone's identity
  • the certificate authonty venfies the person's identity by examining identity documents, and then creates and signs a digital certificate containing the person's identity details and public key
  • convinced who trusts the certificate authonty can use the public key m the certificate with a high degree of certamty that it is genume They just have to venfy that the certificate has mdeed been - 29 - signed by the certificate authonty, whose public key is well-known
  • Each netpage pnnter is assigned a pair of umque identifiers at tune of manufacture which are stored m read-only memory m the pnnter and m the netpage registration server database
  • the pnnter ID 62 is public and umquely identifies the pnnter on the netpage network
  • the secret ID 90 is secret and is used when the pnnter is first registered on the network
  • a prefened embodiment of a pnnter registration protocol is shown m Figure 50 Accordmg to the protocol, when the pnnter connects to the netpage network for the first time after mstallation, it creates a signature public/pnvate key pan 91 ,92 It transmits the secret ID and the public key 91 securely to the netpage registration server 11
  • the server compares the secret ID agamst the pnnter' s secret ID recorded m its database 74, and accepts the registration if the IDs match It then creates and signs a certificate containing the pnnter' s public ID and public signature key, and stores the certificate m the registration database
  • the pnnter stores its pnvate key 92 m its flash memory 81 When the p ⁇ nter needs to exchange a session key with a server, it generates a random session key, signs it usmg its pnvate signature key 92, and securely transmits the session key to the server, I
  • the pnvate key 92 can be stored m the pnnter' s ROM at time of manufacture and the matchmg public key 91 stored m the registration server database at time of manufacture, obviating the need for the secret ID 90
  • pnnter registration can utilize the same technique used for pen registration, as descnbed below
  • a record 808 is created m the netpage registration server database authorizing the publisher to pnnt the publication to the user's default pnnter or a specified pnnter
  • Every document 836 sent to a pnnter via a page server is addressed to a particular user, via the user's alias ID 65 with respect to the publisher, and is signed by the publisher usmg the publisher's pnvate signature key
  • the page server ve ⁇ fies, via the registration database, that the publisher 803,806 is autho ⁇ zed to deliver the publication to the specified user 805
  • the page server venfies the signature usmg the publisher's public key, obtained from the publisher's certificate 67 stored m the registration database
  • the netpage registration server accepts a request to add a pnnting authorization m the form of a subscnption 808 to the database, so long as the request is initiated via a pen registered, via a user, to the p ⁇ nter through which the request is initiated - 30 - 3.2.2 Web Terminal Authorization
  • the user can authorize a Web termmal to pnnt on a pnnter This is useful if the user has a Web termmal m the home which is used to locate documents on the Web for pnnting
  • a prefened embodiment of a Web termmal authorization protocol is shown m Figure 51
  • the one-time authorization proceeds as follows the user requests a Web terminal authorization page via the pnnter 601
  • the netpage registration server generates a short-lifetime one-time-use authorization ID 412 for the Web termmal which is pnnted on the authorization page 413, together with the URI of the pnnter
  • the Web termmal 75 is used to navigate to a netpage registration server registration Web site, where the authorization ID is entered, as well as the URI of the pnnter
  • the Web terminal generates a signature public/pnvate key pan 95,96, and transmits the public key 95 to the registration server
  • the server allocates a termmal ID 68 for the Web termmal, and
  • a prefened embodiment of a Web termmal prmtmg protocol is shown in Figure 52 Accordmg to the protocol, whenever the Web termmal 75 wishes to pnnt on the p ⁇ nter 601, it sends the pnnter' s designated netpage formatting server 77 a request containing the URI of the document to be pnnted, together with the termmal ID 68 It attches a digital signature 418 to the request, created usmg the Web te ⁇ runal's pnvate signature key 96
  • the formatting server ve ⁇ fies, via the registration server 11 , that the terminal is autho ⁇ zed to p ⁇ nt on the specified p ⁇ nter
  • the registration server ve ⁇ fies, via the Web terminal record 809 m the registration server database, that the terminal is autho ⁇ zed to p ⁇ nt to the p ⁇ nter, and ve ⁇ fies the digital signature usmg the terminal's public key 95
  • the user can pnnt a list of cu ⁇ ent pnnting authorizations at any time, and revoke any which are bemg abused
  • Each netpage pen is assigned a umque identifier at time of manufacture which is stored in read-only memory m the pen and m the netpage registration server database
  • a netpage pen can "know” a number of netpage pnnters, and a pnnter can "know” a number of pens
  • a pen communicates with a pnnter via a radio frequency signal whenever it is withm range of the pnnter
  • a pen stores a session key for every p ⁇ nter it knows, mdexed by pnnter ID, and a p ⁇ nter stores a session key for every pen it knows, mdexed by pen ID Both have a large but finite storage capacity for session keys, and will forget a session key on a least-recently-used basis if necessary
  • a prefened embodiment of a pen connection protocol is shown m Figure 53 According to the protocol, when a pen 101 comes withm range of a pnnter 601, the pen and pnnter discover whether they aheady know each other
  • the p ⁇ nter determines, via the registration server 11, whether it is supposed to know the pen This might be, for example, because the pen belongs to a user who is registered to use the pnnter
  • the pnnter sends its own pnnted ID 62, together with the pen ID, to the registration server
  • the registration server determines if a pnnter record 802 and a pen record 801 are linked to the same user record 800 m the registration server database 74 If the pnnter is meant to know the pen but doesn't, then it initiates the automatic pen registration procedure descnbed below If the pnnter isn't meant to know the pen, then it agrees with the pen to ignore it until the pen is placed in a - 31 - charging cup, at which time it initiates the registration procedure
  • the pen In addition to its public pen ID 61, the pen contams a secret key-exchange key 93 The key-exchange key is recorded m the netpage registration server database at time of pen manufacture
  • a prefened embodiment of a pen registration protocol is shown m Figure 54
  • the pen 101 transmits its pen ID to the pnnter 601
  • the pnnter responds with a nonce 423, a random one-time-use number
  • the pen encrypts the nonce usmg its key- exchange key, and returns the encrypted nonce 424 to the pnnter
  • the p ⁇ nter transmits the pen ID, nonce and encrypted nonce to the netpage registration server 11
  • the server venfies, by decrypting the nonce usmg the pen's key-exchange key stored m the registration server database 74, that the pen knows the key-exchange key
  • the server then generates a session key 94 for the pnnter and pen to use, and securely transmits the session
  • the pen uses secret-key rather than public-key encryption because of hardware performance constraints m the pen 3.4 SECURE DOCUMENTS
  • the netpage system supports the delivery of secure documents such as tickets and coupons
  • the netpage pnnter m cludes a facility to pnnt watermarks, but will only do so on request from publishers who are suitably authorized
  • the publisher mdicates its authonty to pnnt watermarks m its certificate, which the p ⁇ nter is able to authenticate
  • the "watermark" pnnting process uses an alternative dither mat ⁇ x m specified "watermark" regions of the page Back-to-back pages contain mirror-image watermark regions which comcide when pnnted
  • the dither matnces used m odd and even pages' watermark regions are designed to produce an interference effect when the regions are viewed together, achieved by looking through the pnnted sheet
  • the effect is similar to a watermark m that it is not visible when looking at only one side of the page, and is lost when the page is copied by normal means
  • Pages of secure documents cannot be copied usmg the built-in netpage copy mechanism descnbed m Section 1 9 above This extends to copying netpages on netpage-aware photocopiers
  • Secure documents are typically generated as part of e-commerce transactions They can therefore mclude the user's photograph which was captured when the user registered biometnc information with the netpage registration server, as descnbed m Section 2
  • a secure document venfication pen can be developed with built-in feedback on venfication failure, to support easy point-of-presentation document venfication
  • the netpage system uses the Secure Electromc Transaction (SET) system as one of its payment systems
  • the netpage registration server acts as a proxy for the netpage user (l e the cardholder) m SET payment transactions
  • the netpage system uses biomet ⁇ cs to authenticate the user and authorize SET payments Because the system is pen-based, the biometnc used is the user's on-lme signature, consisting of time- varying pen position and pressure A fingerprint biometnc can also be used by designing a fingerprint sensor mto the pen, although at a higher cost The type of biometnc used only affects the capture of the biometnc, not the authorization aspects of the system
  • the first step to bemg able to make SET payments is to register the user's biometnc with the netpage registration server This is done m a controlled environment, for example a bank, where the biometnc can be captured at the same time as the user's identity is venfied
  • the biometnc is captured and stored m the registration database, linked to the user's record
  • the user's photograph is also optionally captured and linked to the record
  • the SET cardholder regisfration process is completed, and the resulting pnvate signature key and certificate are stored m the database
  • the user's payment card information is also stored, giving the netpage regisfration server enough mformation to act as the user's proxy m any SET payment transaction
  • the pnnter securely transmits the order mformation, the pen ID and the biometnc data to the netpage regisfration server
  • the server venfies the biometnc with respect to the user identified by the pen ID, and from then on acts as the user's proxy m completing the SET payment transaction
  • the netpage system mcludes a mechanism for micro-payments, to allow the user to be conveniently charged for pnnting low-cost documents on demand and for copying copy ⁇ ght documents, and possibly also to allow the user to be reimbursed for expenses incu ⁇ ed m pnnting advertismg matenal The latter depends on the level of subsidy aheady - 33 - provided to the user
  • a network account which aggregates micro- payments
  • the user receives a statement on a regular basis, and can settle any outstandmg debit balance usmg the standard payment mechanism
  • the network account can be extended to aggregate subscnption fees for penodicals, which would also otherwise be presented to the user m the form of mdividual statements 4.4 TRANSACTIONS
  • the application When a user requests a netpage m a particular application context, the application is able to embed a user-specific transaction ID 55 in the page Subsequent mput through the page is tagged with the transaction ID, and the application is thereby able to establish an appropnate context for the user's mput
  • the netpage registration server mstead maintains an anonymous relationship between a user and an application via a umque alias ID 65, as shown m Figure 24 Whenever the user activates a hyperlink tagged with the "registered" att ⁇ bute, the netpage page server asks the netpage registration server to translate the associated application ID 64, together with the pen ID 61 , mto an alias ID 65 The alias ID is then submitted to the hyperlink's application The application maintains state mformation mdexed by alias ID, and is able to retneve user-specific state information without knowledge of the global identity of the user
  • the system also maintains an independent certificate and pnvate signature key for each of a user's applications, to allow it to sign application transactions on behalf of the user usmg only application-specific information
  • the system records a favonte application on behalf of the user for any number of product types
  • Each application is associated with an application provider, and the system maintains an account on behalf of each application provider, to allow it to credit and debit the provider for click-through fees etc
  • An application provider can be a publisher of pe ⁇ odical subsc ⁇ bed content
  • the system records the user's willingness to receive the subscnbed publication, as well as the expected frequency of publication 4.5 RESOURCE DESCRIPTIONS AND COPYRIGHT
  • Each document and content object may be descnbed by one or more resource descnptions 842
  • Resource descnptions use the Dublin Core metadata element set, which is designed to facilitate discovery of electromc resources Dublin Core metadata conforms to the World Wide Web Consortium (W3C) Resource Descnption Framework (RDF)
  • W3C World Wide Web Consortium
  • RDF Resource Descnption Framework
  • a resource descnption may identify ⁇ ghts holders 920
  • the netpage system automatically transfers copynght fees from users to nghts holders when users p ⁇ nt copynght content 5 COMMUNICATIONS PROTOCOLS
  • a communications protocol defines an ordered exchange of messages between entities
  • entities such as pens, p ⁇ nters and servers utilise a set of defined protocols to cooperatively handle user mteraction with the netpage system
  • Each protocol is illustrated by way of a sequence diagram m which the ho ⁇ zontal dimension is used to - 34 - represent message flow and the vertical dimension is used to represent time
  • Each entity is represented by a rectangle containing the name of the entity and a vertical column representing the lifeline of the entity Du ⁇ ng the time an entity exists, the lifeline is shown as a dashed lme Dunng the time an entity is active, the lifeline is shown as a double lme
  • a large number of users may subsc ⁇ be to a penodical publication
  • Each user's edition may be laid out differently, but many users' editions will share common content such as text objects and image objects
  • the subscnption delivery protocol therefore delivers document structures to mdividual pnnters via pomtcast, but delivers shared content objects via multicast
  • a prefened embodiment of a subscnption delivery protocol is shown m Figure 43 Accordmg to the protocol, the application (l e publisher) first obtains a document ID 51 for each document from an ID server 12 It then sends each document structure 836, mcludmg its document ID and page descnptions 5, to the page server 10 responsible for the document's newly allocated ID It mcludes its own application ID 64, the subscnber's alias ID 65, and the relevant set of multicast channel names 402 It attaches a digital signature 401 to the message, created usmg its pnvate signature key
  • the page server uses the application ID and alias ID to obtain from the regisfration server 11 the conespondmg user ID 60, the user's selected p ⁇ nter ID 62 (which may be explicitly selected for the application, or may be the user's default pnnter), and the application's certificate 67
  • the application's certificate allows the page server to venfy the message signature 401
  • the page server's request to the registration server fails if the application ID and alias ID don't together identify a subscnption 808
  • the page server then allocates document and page instance IDs and forwards the page desc ⁇ ptions 5, mcludmg page IDs 50, to the pnnter It mcludes the relevant set of multicast channel names for the pnnter to listen to
  • a prefened embodiment of a hyperlink activation protocol is shown m Figure 45 According to the protcol, when a user clicks on a netpage with a netpage pen, the pen communicates the click 406 to the nearest netpage pnnter
  • the click identifies the page and a location on the page
  • the pnnter already knows the pen ID 61 of the pen from the pen connection protocol
  • the pnnter determines, via the DNS, the network address of the page server 10a handling the particular page ID 50 The address may aheady be m its cache if the user has recently mteracted with the same page
  • the p ⁇ nter then forwards the pen ID, its own p ⁇ nter ID 62, the page ID and click location to the page server
  • the page server loads the page descnption 5 identified by the page ID and determines which mput element's zone 58, if any, the click lies m Assu ⁇ ung the relevant mput element is a hyperlink element 844, the page server then obtains the associated application ID 64 and link ID 54, and determines, via the DNS, the network address of the application server hosting the application 71 - 35 - The page server uses the pen ID 61 to obtain the conespondmg user ID 60 from the registration server 11, and then allocates a globally umque hyperlink request ID 52 and builds a hyperlink request 934
  • the hyperlink request class diagram is shown m Figure 44
  • the hyperlink request records the IDs of the requesting user and pnnter, and identifies the clicked hyperlink mstance 862
  • the page server then sends its own server ID 53, the hyperlink request ID, and the link ID to the application
  • the application produces a response document according to application-specific logic, and obtains a document ID 51 from an ID server 12 It then sends the document 836 to the page server 10b responsible for the document's newly allocated ID, together with the requesting page server's ID and the hyperlink request ID
  • the second page server sends the hyperlink request ID and application ID to the first page server 10a to obtain the conespondmg user ID and pnnter ID 62
  • the first page server rejects the request if the hyperlink request has expned or is for a different application
  • the second page server allocates a document mstance ID and page IDs 50, returns the newly allocated page IDs to the application, adds the complete document to its own database, and finally sends the page desc ⁇ ptions 5 to the requestmg pnnter
  • the hyperlink mstance may include a meaningful transaction ID 55, m which case the first page server mcludes the transaction ID m the message sent to the application This allows the application to establish a transaction- specific context for the hyperlink activation
  • the first page server 10a sends both the pen ID 61 and the hyperlink's application ID 64 to the registration server 11 to obtain not just the user ID conespondmg to the pen ID but also the alias ID 65 conespondmg to the application ID and the user ID It mcludes the alias ID m the message sent to the application, allowing the application to establish a user-specific context for the hyperlink activation
  • a prefened embodiment of a handwnting recognition protocol is shown m Figure 46
  • the pen when a user draws a sfroke on a netpage with a netpage pen, the pen communicates the stroke 406 to the nearest netpage pnnter
  • the sfroke identifies the page and a path on the page
  • the pnnter forwards the pen ID 61, its own p ⁇ nter ID 62, the page ID 50 and stroke path to the page server 10 in the usual way
  • the page server loads the page descnption 5 identified by the page ID and determines which mput element's zone 58, if any, the sfroke intersects
  • the page server appends the sfroke to the text field's digital ink
  • the page server sends the pen ID and the pending digital ink 407 to the registration server 11 for mterpretation It may also send the existing text value 408 of the text field to allow the registration server to handle hand-drawn editing commands such as stnke-outs
  • the registration server identifies the user conespondmg to the pen, and uses the user's accumulated handwnting model 822 to interpret the strokes as handwntten text Once it has converted the strokes to text, the registration server returns the converted text 409 to the requesting page server
  • the page server appends the text to the text value of the text field
  • FIG. 47 A prefened embodiment of a signature venfication protocol is shown m Figure 47 According to the protocol, a stroke is delivered to a page-specific page server m the same way as descnbed m Section 5 3 Assuming the mput element whose zone the stroke 406 intersects is a signature field 880, the page server 10 appends the stroke to the signature field's digital ink
  • the page server After a penod of inactivity m the zone of the signature field, the page server sends the pen ID 61 and the - 36 - pendmg digital ink 407 to the registration server 11 for venfication It also sends the application ID 64 associated with the form of which the signature field is part, as well as the form ID 56 and the current data content 405 of the form
  • the registration server identifies the user conespondmg to the pen, and uses the user's dynamic signature biometnc 818 to venfy the strokes as the user's signature
  • the registration server uses the application ID 64 and user ID 60 to identify the user's application-specific pnvate signature key It then uses the key to generate a digital signature of the form data, and returns the digital signature 410 to the requesting page server
  • the page server assigns the digital signature to the signature field and sets the associated form's status to frozen
  • the digital signature m cludes the alias ID 65 of the conespondmg user This allows a smgle form to capture multiple users' signatures 5.5 FORM SUBMISSION PROTOCOL
  • Form submission occurs via a form hyperlink activation
  • a prefened embodiment of a form submission protocol is shown m Figure 48 It follows the protocol defined m Section 5 2, with some form-specific additions
  • the hyperlink activation message sent by the page server 10 to the application 71 also contams the form ID 56 and the cu ⁇ ent data content of the form If the form contams any signature fields, then the application venfies each one by extracting the alias ID 65 associated with the conespondmg digital signature and obtaining the conespondmg certificate from the regisfration server 11
  • fees and commissions may be payable from an application provider to a publisher on c ck-throughs, transactions and sales Commissions on fees and commissions on commissions may also be payable from the publisher to the provider of the pnnter
  • a prefened embodiment of a commission payment protocol is shown m Figure 49 According to the protocol, the hyperlink request ID 52 is used to route a fee or commission credit from the target application provider 70a
  • the target application receives the hyperlink request ID from the page server 10 when the hyperlink is first activated, as descnbed m Section 5 2
  • the target application needs to credit the source application provider, it sends the application provider credit 414 to the ongmal page server together with the hyperlink request ID
  • the page server uses the hyperlink request ID to identify the source application, and sends the credit on to the relevant registration server 11 together with the source application ID 64, its own server ID 53, and the hyperlink request ID
  • the registration server credits the conespondmg application provider's account 827 It also notifies the application provider
  • the application provider needs to credit the pnnter provider, it sends the pnnter provider credit 415 to the ongmal page server together with the hyperlink request ID
  • the page server uses the hyperlink request ID to identify the pnnter, and sends the credit on to the relevant regisfration server together with the p ⁇ nter ID
  • the registration server credits the conespondmg pnnter provider account 814
  • the source application provider is optionally notified of the identity of the target application provider, and the p ⁇ nter provider of the identity of the source application provider
  • the pen generally designated by reference numeral 101, mcludes a housmg 102 m the form of a plastics moulding having walls 103 defining an mte ⁇ or space 104 for mounting the pen components
  • the pen top 105 is m operation rotatably mounted at one end 106 of the housing 102
  • a semi-transparent - 37 - cover 107 is secured to the opposite end 108 of the housmg 102
  • the cover 107 is also of moulded plastics, and is formed from semi-transparent matenal m order to enable the user to view the status of the LED mounted withm the housmg 102
  • the cover 107 m cludes a mam part 109 which substantially sunounds the end 108 of the housmg 102 and a projecting portion 110 which projects back from the mam part 109 and fits withm a conespondmg slot 111 formed m the walls 103 of the housmg 102
  • a radio antenna 112
  • Screw threads 113 su ⁇ ounding an aperture 113A on the cover 107 are a ⁇ anged to receive a metal end piece 114, mcludmg conespondmg screw threads 115
  • the metal end piece 114 is removable to enable mk cartndge replacement
  • a tn-color status LED 116 is mounted on a flex PCB 117
  • the antenna 112 is also mounted on the flex PCB 117
  • the status LED 116 is mounted at the top of the pen 101 for good all-around visibility
  • the pen can operate both as a normal marking mk pen and as a non-marking stylus An mk pen cartndge
  • a second flex PCB 129 is mounted on an electronics chassis 130 which sits withm the housmg 102
  • the second flex PCB 129 mounts an infrared LED 131 for providing infrared radiation for projection onto the surface
  • An image sensor 132 is provided mounted on the second flex PCB 129 for receivmg reflected radiation from the surface
  • the second flex PCB 129 also mounts a radio frequency chip 133, which mcludes an RF transmitter and RF receiver, and a controller chip 134 for controlling operation of the pen 101
  • An optics block 135 (formed from moulded clear plastics) sits withm the cover 107 and projects an infrared beam onto the surface and receives images onto the image sensor 132
  • Power supply wnes 136 connect the components on the second flex PCB 129 to battery contacts 137 which are mounted withm the cam ba ⁇ el 125
  • a terminal 138 connects to the battery contacts 137 and the cam band 125
  • Rubber gnp pads 141 and 142 are provided towards the end 108 of the housmg 102 to assist gnpping the pen 101, and top 105 also mcludes a clip 142 for clipping the pen 101 to apocket 6.2 PEN CONTROLLER
  • the pen 101 is a ⁇ anged to determrne the position of its mb (stylus mb 121 or ink cartridge mb 119) by imaging, m the infrared spectrum, an area of the surface m the vicinity of the mb It records the location data from the - 38 - nearest location tag, and is arranged to calculate the distance of the mb 121 or 119 from the location tab utilismg optics
  • controller chip 134 calculates the onentation of the pen and the nib-to-tag distance from the perspective distortion observed on the imaged tag
  • the pen 101 can transmit the digital ink data (which is encrypted for secunty and packaged for efficient transmission) to the computing system
  • the digital ink data is transmitted as it is formed
  • digital ink data is buffered withm the pen 101 (the pen 101 cncuifry mcludes a buffer ananged to store digital ink data for approximately 12 minutes of the pen motion on the surface) and can be transmitted later
  • the controller chip 134 is mounted on the second flex PCB 129 m the pen 101
  • Figure 10 is a block diagram illustrating m more detail the architecture of the confroller chip 134 Figure 10 also shows representations of the RF chip 133, the image sensor 132, the tn-color status LED 116, the IR illumination LED 131, the IR force sensor LED 143, and the force sensor photodiode 144
  • the pen controller chip 134 mcludes a controlling processor 145 Bus 146 enables the exchange of data between components of the controller chip 134 Flash memory 147 and a 512 KB DRAM 148 are also mcluded
  • An analog-to-digital converter 149 is ananged to convert the analog signal from the force sensor photodiode 144 to a digital signal
  • An image sensor mterface 152 interfaces with the image sensor 132
  • a transceiver controller 153 and base band cncuit 154 are also mcluded to mterface with the RF chip 133 which mcludes an RF cncuit 155 and RF resonators and mductors 156 connected to the antenna 112
  • the controlling processor 145 captures and decodes location data from tags from the surface via the image sensor 132, monitors the force sensor photodiode 144, controls the LEDs 116, 131 and 143, and handles short-range radio communication via the radio transceiver 153 It is a medium-performance ( ⁇ 40MHz) general-purpose RISC processor
  • the processor 145 digital transceiver components (transceiver confroller 153 and baseband cncuit 154), image sensor mterface 152, flash memory 147 and 512KB DRAM 148 are integrated m a single controller ASIC Analog RF components (RF cncuit 155 and RF resonators and mductors 156) are provided in the separate RF chip
  • the image sensor is a 215x215 pixel CCD (such a sensor is produced by Matsushita Electromc Corporation, and is desc ⁇ bed m a paper by Itakura, K T Nobusada, N Okusenya, R Nagayoshi, and M Ozaki, "A 1mm 50k-P ⁇ xel IT CCD Image Sensor for Miniature Camera System", IEEE Transactions on Electromc Devices, Volt 47, number 1, January 2000, which is incorporated herein by reference) with an IR filter
  • the controller ASIC 134 enters a quiescent state after a pe ⁇ od of inactivity when the pen 101 is not in contact with a surface It mcorporates a dedicated cncuit 150 which monitors the force sensor photodiode 144 and wakes up the controller 134 via the power manager 151 on a pen-down event
  • the radio transceiver communicates m the unlicensed 900MHz band normally used by cordless telephones, or alternatively m the unlicensed 2 4GHz mdustnal, scientific and medical (ISM) band, and uses frequency hoppmg and collision detection to provide interference-free communication
  • ISM scientific and medical
  • the pen mcorporates an Infrared Data Association (IrDA) mterface for short- range communication with a base station or netpage pnnter
  • IrDA Infrared Data Association
  • the pen 101 m cludes a parr of orthogonal accelerometers mounted m the normal plane of the pen 101 axis
  • the accelerometers 190 are shown m Figures 9 and 10 m ghost outline
  • the provision of the accelerometers enables this embodiment of the pen 101 to sense motion without - 39 - reference to surface location tags, allowmg the location tags to be sampled at a lower rate
  • Each location tag ID can then identify an object of mterest rather than a position on the surface For example, if the object is a user mterface mput element (e g a command button), then the tag ID of each location tag within the area of the mput element can dnectly identify the mput element
  • the acceleration measured by the accelerometers m each of the x and y dnections is integrated with respect to tune to produce an instantaneous velocity and position
  • the vertically-mounted netpage wallpnnter 601 is shown fully assembled m Figure 11 It pnnts netpages on
  • An integral binding assembly 605 applies a stnp of glue along one edge of each pnnted sheet, allowmg it to adhere to the previous sheet when pressed against it This creates a final bound document 618 which can range m thickness from one sheet to several hundred sheets
  • the replaceable ink cartndge 627 shown m Figure 13 coupled with the duplexed pnnt engmes, has bladders or chambers for storing fixative, adhesive, and cyan, magenta, yellow, black and infrared inks
  • the cartndge also contams a micro a filter m a base molding
  • the micro an filter interfaces with an an pump 638 mside the pnnter via a hose 639 This provides filtered an to the printheads to prevent ingress of micro particles mto the MemjetTM printheads 350 which might otherwise clog the pnnthead nozzles
  • the operational life of the filter is effectively linked to the life of the cartndge
  • the ink cartndge is a fully recyclable product with a capacity for p ⁇ nting and gluing 3000 pages (1500 sheets)
  • the motorized media pick-up roller assembly 626 pushes the top sheet directly from the media tray past a paper sensor on the first pnnt engme 602 mto the duplexed MemjetTM pnnthead assembly
  • the two MemjetTM pnnt engmes 602 and 603 are mounted m an opposmg m-lme sequential configuration along the straight paper path
  • the paper 604 is drawn mto the first p ⁇ nt engme 602 by integral, powered pick-up rollers 626
  • the position and size of the paper 604 is sensed and full bleed pnnting commences Fixative is pnnted simultaneously to aid drying m the shortest possible time
  • the paper exits the first MemjetTM pnnt engme 602 through a set of powered exit spike wheels (aligned along the straight paper path), which act against a rubberized roller These spike wheels contact the 'wet' pnnted surface and continue to feed the sheet 604 mto the second MemjetTM pnnt engme 603
  • the paper 604 passes from the duplexed pnnt engmes 602 and 603 mto the bmder assembly 605
  • the pnnted page passes between a powered spike wheel axle 670 with a fibrous support roller and another movable axle with spike wheels and a momentary action glue wheel
  • the movable axle/glue assembly 673 is mounted to a metal support bracket and it is transported forward to mterface with the powered axle 670 via gears by action of a camshaft A separate motor powers this camshaft
  • the glue wheel assembly 673 consists of a partially hollow axle 679 with a rotating couplmg
  • the netpage p ⁇ nter controller consists of a controlling processor 750, a factory-installed or field-installed network mterface module 625, a radio transceiver (transceiver confroller 753, baseband cncmt 754, RF cncmt 755, and RF resonators and mductors 756), dual raster image processor (RIP) DSPs 757, duplexed p ⁇ nt engme controllers 760a and 760b, flash memory 658, and 64MB of DRAM 657, as illustrated m Figure 14
  • the controlling processor handles communication with the network 19 and with local wneless netpage pens 101, senses the help button 617, controls the user mterface LEDs 613-616, and feeds and synchronizes the RIP DSPs 757 and p ⁇ nt engme controllers 760 It consists of a medium-performance general-purpose microprocessor
  • the controlling processor 750 communicates with the p ⁇ nt engme controllers 760 via a high-speed senal bus 659
  • the RIP DSPs rastenze and compress page descnptions to the netpage pnnter' s compressed page format
  • Each p ⁇ nt engme controller expands, dithers and pnnts page images to its associated MemjetTM pnnthead 350 m real time (I e at over 30 pages per minute)
  • the duplexed p ⁇ nt engme controller s p ⁇ nt both sides of a sheet simultaneously
  • the master pnnt engme controller 760a controls the paper transport and momtors ink usage in conjunction with the master QA chip 665 and the mk cartndge QA chip 761
  • the pnnter controller's flash memory 658 holds the software for both the processor 750 and the DSPs 757, as well as configuration data This is copied to mam memory 657 at boot time
  • the processor 750, DSPs 757, and digital transceiver components are integrated m a smgle controller ASIC 656
  • Analog RF components RF cncuit 755 and RF resonators and mductors 756) are provided m a separate RF chip 762
  • the network mterface module 625 is separate, smce netpage p ⁇ nters allow the network connection to be factory-selected or field-selected Flash memory 658 and the 2x256Mbit
  • DRAM 657 is also off-chip
  • the p ⁇ nt engme controllers 760 are provided m separate ASICs
  • a vanety of network mterface modules 625 are provided, each providing a netpage network mterface 751 and optionally a local computer or network mterface 752
  • Netpage network Internet interfaces include POTS modems, Hybnd Fiber-Coax (HFC) cable modems, ISDN modems, DSL modems, satellite transceivers, cu ⁇ ent and next- generation cellular telephone transceivers, and wneless local loop (WLL) transceivers
  • Local interfaces mclude IEEE 1284 (parallel port), lOBase-T and 100Base-T Ethernet, USB and USB 2 0, IEEE 1394 (Fnewne), and vanous emerging home networking interfaces If an Internet connection is available on the local network, then the local network mterface can be used as the netpage network mterface
  • the radio transceiver 753 communicates m the unlicensed 900MHz band normally used by cordless telephones, or alternatively in the unlicensed 2 4GHz indus
  • the pnnter controller optionally mcorporates an Infrared Data Association (IrDA) mterface for receiving data "squirted" from devices such as netpage cameras
  • IrDA Infrared Data Association
  • the p ⁇ nter uses the IrDA mterface for short-range communication with suitably configured netpage pens - 41 -
  • the ma processor 750 Once the ma processor 750 has received and venfied the document's page layouts and page objects, it runs the appropnate RIP software on the DSPs 757
  • the DSPs 757 rastenze each page descnption and compress the rastenzed page image
  • the mam processor stores each compressed page image m memory
  • the simplest way to load-balance multiple DSPs is to let each DSP rastenze a separate page
  • the DSPs can always be kept busy since an arbitrary number of rastenzed pages can, m general, be stored m memory This strategy only leads to potentially poor DSP utilization when raste ⁇ zmg short documents
  • Watermark regions m the page desc ⁇ ption are rastenzed to a contone-resolution bi-level bitmap which is losslessly compressed to negligible size and which forms part of the compressed page image
  • the infrared (IR) layer of the pnnted page contams coded netpage tags at a density of about six per mch
  • Each tag encodes the page ID, tag ID, and control bits, and the data content of each tag is generated dunng rasterization and stored m the compressed page image
  • the mam processor 750 passes back-to-back page images to the duplexed pnnt engine controllers 760
  • Each pnnt engme controller 760 stores the compressed page image m its local memory, and starts the page expansion and p ⁇ nting pipelme Page expansion and pnnting is pipelined because it is impractical to store an entire 114MB bi-level CMYK+IR page image m memory
  • the page expansion and printing pipelme of the pnnt engme controller 760 consists of a high speed IEEE 1394 senal mterface 659, a standard JPEG decoder 763, a standard Group 4 Fax decoder 764, a custom halftoner/compositor unit 765, a custom tag encoder 766, a lme loader/formatter unit 767, and a custom mterface 768 to the MemjetTM pnnthead 350
  • the pnnt engme confroller 360 operates m a double buffered manner While one page is loaded mto DRAM 769 via the high speed senal mterface 659, the previously loaded page is read from DRAM 769 and passed through the pnnt engme controller pipelme Once the page has fimshed p ⁇ nting, the page just loaded is pnnted while another page is loaded
  • the first stage of the pipelme expands (at 763) the JPEG-compressed contone CMYK layer, expands (at 764) the Group 4 Fax-compressed bi-level black layer, and renders (at 766) the bi-level netpage tag layer according to the tag format defined m section 1 2, all m parallel
  • the second stage dithers (at 765) the contone CMYK layer and composites (at 765) the bi-level black layer over the resulting bi-level CMYK layer
  • the resultant bi-level CMYK+IR dot data is buffered and formatted (at 767) for pnnting on the MemjetTM pnnthead 350 via a set of lme buffers Most of these lme buffers are stored m the off-chip DRAM
  • the final stage pnnts the six channels of bi-level dot data (mcludmg fixative) to the MemjetTM pnnthead 350 via the pn
  • pnnt engme controllers 760 When several pnnt engme controllers 760 are used m unison, such as in a duplexed configuration, they are synchronized via a shared lme sync signal 770 Only one pnnt engme 760, selected via the external master/slave pm 771, generates the lme sync signal 770 onto the shared lme
  • the p ⁇ nt engme controller 760 contams a low-speed processor 772 for synchronizing the page expansion and rendering pipelme, configuring the pnnthead 350 via a low-speed senal bus 773, and controlling the stepper motors

Abstract

A network publishing authorization protocol, for use in a network connected to a printer, a server and a publisher of network publications. The protocol authorizes the printing of a publication at the printer. It includes the steps of: addressing the publication to a user; signing the publication using a private key; sending the publication to the printer; and confirming that the publication may be printed at the printer, by verifying the private key signature. Confirmation may take place at the printer or at the server.

Description

NETWORK PUBLISHING AUTHORIZATION PROTOCOL
FIELD OF INVENTION
The present invention relates generally to methods, systems and apparatus for interacting with computers It relates particularly to a network publishing authorization protocol, for use in a network connected to a printer, a server and a publisher of network publications
The invention has been developed primarily to allow a large number of distπbuted users to interact with networked information via printed matter and optical sensors, thereby to obtain interactive pπnted matter on demand via high-speed networked color printers Although the invention w ill largely be described herein with reference to this use. it will be appreciated that the invention is not limited to use in this field
CO-PENDING APPLICATIONS
Various methods, systems and apparatus relating to the present invention are disclosed in the follow ing co-pending applications filed by the applicant or assignee of the present invention simultaneously with the present application
PCT/AU00/00518. PCT/AU00/00519. PCT/AU00/00520, PCT/AU00/00521 , PCT/AU00/00523, PCT/AUOO/00524. PCT/AU00/00525. PCT/AU00/00526, PCT/AU00/00527, PCT/AU00/00528, PCT/AU00/00529. PCT/AUOO/00530, PCT/AU00/00531 , PCT/AU00/00532. PCT/AU00/00533, PCT/AU00/00534. PCT/AUOO/00535, PCT/AU00/00536, PCT/AU00/00537. PCT/AU00/00538, PCT/AU00/00539, PCT/AUOO/00540. PCT/AU00/00541 , PCT/AU00/00542, PCT/AU00/00543,
PCT/AU00/00544. PCT/AU00/00545. PCT/AU00/00547, PCT/AU00/00546. PCT/AU00/00554, PCT/AU00/00556. PCT/AU00/00557. PCT/AU00/00558 PCT/AU00/00559. PCT/AU00/00560, PCT/AU00/00561. PCT/AU00/00562, PCT/AU00/00563, PCT/AU00/00564. PCT/AU00/00566, PCT/AU00/00567, PCT/AU00/00568. PCT/AU00/00569, PCT/AU00/00570, PCT/AU00/00571 , PCT/AU00/00572, PCT/AU00/00573, PCT/AU00/00574, PCT/AU00/00575, PCT/AU00/00576,
PCT/AU00/00577. PCT/AU00/00578, PCT/AUOO/00579, PCT/AU00/00581, PCT/AU00/00580, PCT/AU00/00582. PCT/AU00/00587, PCT/AU00/00588, PCT/AU00/00589, PCT/AU00/00583, PCT/AU00/00593. PCT/AUOO/00590, PCT/AUOO/00591. PCT/AU00/00592. PCT/AU00/00594, PCT/AU00/00595. PCT/AU00/00596, PCT/AU00/00597, PCT/AU00/00598. PCT/AU00/00516, and PCT/AU00/00517
The disclosures of these co-pending applications are incorporated herein by cross-reference
BACKGROUND
Cryptography is used to protect sensitive information, both in storage and in transit, and to authenticate parties to a transaction There are two classes of cryptography in widespread use secret-key cryptography and public-key cryptography
Secret-key cryptography, also referred to as symmetric cryptography, uses the same key to encrypt and decrypt a message Two parties wishing to exchange messages must first arrange to securely exchange the secret key
RECTIFIED SHEET (Rule 91) - 1a -
Pubhc-key cryptography, also referred to as asymmetric cryptography, uses two encryption keys The two keys are mathematically related in such a way that any message encrypted using one key can only be decrypted using the other key One of these keys is then published, while the other is kept private The public key is used to encrypt any message intended for the holder of the private key Once encrypted using the public key, a message can only be decrypted using the private ke\ Thus two parties can securely exchange messages without first having to exchange a secret key To ensure that the private key is secure, it is normal for the holder of the private key to generate the key pair
Public-key cryptography can be used to create a digital signature If the holder of the private key creates a known hash of a message and then encrypts the hash using the private key, then anyone can verify that the encrypted hash constitutes the "signature" of the holder of the private key with respect to that particular message, simply by
RECTIFIED SHEET (Rule 91) - 2 - decrypt g the encrypted hash usmg the public key and venfying the hash agamst the message If the signature is appended to the message, then the recipient of the message can venfy both that the message is genume and that it has not been altered m transit
To make public-key cryptography work, there has to be a way to distnbute public keys which prevents impersonation This is normally done usmg certificates and certificate authonties A certificate authonty is a trusted third party which authenticates the connection between a public key and someone's identity The certificate authonty venfies the person's identity by examining identity documents etc , and then creates and signs a digital certificate containing the person's identity details and public key Anyone who trusts the certificate authonty can use the public key m the certificate with a high degree of certamty that it is genume They just have to venfy that the certificate has indeed been signed bv the certificate authonty, whose public key is well-known
In most transaction environments, public-key cryptography is only used to create digital signatures and to securely exchange secret session keys Secret-key cryptography is used for all other purposes
SUMMARY OF INVENTION The mvention is m a network connected to a pnnter and a publisher of network publications, a network publishing authorization protocol for authorizing the printing of a publication at the pπnter, including the steps of Addressing the publication to a user, Signing the publication usmg a pnvate key, Sending the publication to the pnnter, and
Confirming that the publication may be pnnted at the pnnter, by venfymg the pnvate key signature A user may be registered with a pnnter by creating a record in a database of a server Similarly a publisher may be registered with the server The server may hold the publisher's public key
The user may subscnbe to a publication of the publisher by creating a record m a database of the server authorizing the publisher to send the publication to the pnnter The server may hold subscnption record for this purpose, containing details of the publisher's identity and the user's alias identity The server may hold details of the user's alias identity for this purpose
The confirmation may be earned out at the pnnter It may be accomplished by confirming that the publisher is authorized to pnnt the publication to the pnnter, by accessmg the server to confirm the subscnption It may also involve venfymg the publisher's signature at the pnnter usmg the publisher's public key, obtained from the server It may also mvolve venfymg at the pnnter that the pπnter is registered for the user, by accessmg the server The confirmation may be earned out at the server The server may accomplish this by checking that the publisher is authorized to pπnt the publication to the pnnter, by confirming the subscnption It may also mvolve venfymg the publisher's signature usmg the publisher's public key It may also mvolve venfymg that the pnnter is registered for the user
The publisher may first obtain a document identity for each document to be pnnted from an identity server Then it may send each document structure, including its identity and page descnptions to a page server responsible for that document identity It may mclude its own identity, the user's alias identity and a set of multicast channel names, and it may sign the message usmg its pnvate signature
The page server may then use the publisher's identity and the user's alias identity to obtain the corresponding user's identity and the user's printer's identity from the registration server The pnnter may be the user's default pnnter or a pnnter selected for this application
The confirmation is earned out by the registration server, and fails if the publisher's identity and the alias - 3 - ldentity don't together identify a subscnption
The page server may then allocate document and page instance identities and forwards the page descnptions, mcludmg page identities, to the pπnter It may also send the names of the multicast channels for the pπnter to listen to Finally it may return the newly allocated page identities to the publisher for future use A large number of users may subscπbe to a penodical publication Each user's edition may be laid out differently, but many users' editions will share common content such as text objects and image objects The subscnption delivery protocol may therefore deliver document structures to mdividual pnnters via pomtcast, but deliver shared content objects via multicast
Once the application has distnbuted all of the document structures to the subscnbers' selected pπnters via the relevant page servers, it multicasts the vanous subsets of the shared objects on the previously selected multicast channels Both page servers and pπnters momtor the appropnate multicast channels and receive their required content objects They are then able to populate the previously pomtcast document structures This allows the page servers to add complete documents to their databases, and it allows the pnnters to pnnt the documents
The confirmation may be earned out at a second server to which the publication is sent It may be accomplished by confirmmg that the publisher is authorized to pπnt the publication to the pnnter, by accessmg the first server to confirm the subscnption It may also mvolve venfymg the publisher's signature at the second server usmg the publisher's public key, obtained from the first server It may also mvolve venfying at the second server that the pnnter is registered for the user, by accessmg the first server If the confirmation succeeds, the publication may be sent from the second server to the pπnter BRIEF DESCRIPTION OF DRAWINGS
Prefened and other embodiments of the mvention will now be descπbed, by way of non-limiting example only, with reference to the accompanying drawings, m which
Figure 1 is a schematic of a the relationship between a sample pπnted netpage and its online page descnption,
Figure 2 is a schematic view of a interaction between a netpage pen, a netpage pnnter, a netpage page server, and a netpage application server,
Figure 3 illustrates a collection of netpage servers and pπnters interconnected via a network,
Figure 4 is a schematic view of a high-level structure of a pπnted netpage and its online page descπption,
Figure 5 is a plan view showing a structure of a netpage tag,
Figure 6 is a plan view showing a relationship between a set of the tags shown in Figure 5 and a field of view of a netpage sensing device m the form of a netpage pen,
Figure 7 is a flowchart of a tag image processmg and decoding algoπthm,
Figure 8 is a perspective view of a netpage pen and its associated tag-sensing field-of-view cone,
Figure 9 is a perspective exploded view of the netpage pen shown m Figure 8,
Figure 10 is a schematic block diagram of a pen controller for the netpage pen shown m Figures 8 and 9, Figure 11 is a perspective view of a wall-mounted netpage pπnter,
Figure 12 is a section through the length of the netpage pπnter of Figure 11 ,
Figure 12a is an enlarged portion of Figure 12 showing a section of the duplexed pnnt engines and glue wheel assembly,
Figure 13 is a detailed view of the ink cartndge, ink, air and glue paths, and pnnt engines of the netpage pnnter of
Figures 11 and 12, Figure 14 is a schematic block diagram of a pnnter controller for the netpage pnnter shown m Figures 11 and 12,
Figure 15 is a schematic block diagram of duplexed pπnt engine controllers and Memjet™ printheads associated with - 4 - the pnnter controller shown m Figure 14,
Figure 16 is a schematic block diagram of the pnnt engine controller shown m Figures 14 and 15,
Figure 17 is a perspective view of a smgle Memjet™ pnnting element, as used m, for example, the netpage pnnter of
Figures 10 to 12, Figure 18 is a perspective view of a small part of an aπay of Memjet™ pπnting elements,
Figure 19 is a senes of perspective views illustrating the operating cycle of the Memjet™ pπnting element shown m
Figure 13,
Figure 20 is a perspective view of a short segment of a pagewidth Memj et™ pnnthead,
Figure 21 is a schematic view of a user class diagram, Figure 22 is a schematic view of a pnnter class diagram,
Figure 23 is a schematic view of a pen class diagram,
Figure 24 is a schematic view of an application class d agram,
Figure 25 is a schematic view of a document and page descnption class diagram,
Figure 26 is a schematic view of a document and page ownership class diagram, Figure 27 is a schematic view of a terminal element specialization class diagram,
Figure 28 is a schematic view of a static element specialization class diagram,
Figure 29 is a schematic view of a hyperlink element class diagram,
Figure 30 is a schematic view of a hyperlink element specialization class diagram,
Figure 31 is a schematic view of a hyperhnked group class diagram, Figure 32 is a schematic view of a form class diagram,
Figure 33 is a schematic view of a digital ink class diagram,
Figure 34 is a schematic view of a field element specialization class diagram,
Figure 35 is a schematic view of a checkbox field class diagram,
Figure 36 is a schematic view of a text field class diagram, Figure 37 is a schematic view of a signature field class diagram,
Figure 38 is a flowchart of an mput processmg algonthm,
Figure 38a is a detailed flowchart of one step of the flowchart of Figure 38,
Figure 39 is a schematic view of a page server command element class diagram,
Figure 40 is a schematic view of a resource descnption class diagram, Figure 41 is a schematic view of a favontes list class diagram,
Figure 42 is a schematic view of a history list class diagram,
Figure 43 is a schematic view of a subscnption delivery protocol,
Figure 44 is a schematic view of a hyperlink request class diagram,
Figure 5 is a schematic view of a hyperlink activation protocol, Figure 46 is a schematic view of a handwnting recognition protocol,
Figure 47 is a schematic view of a signature venfication protocol,
Figure 48 is a schematic view of a form submission protocol,
Figure 49 is a schematic view of a commission payment protocol,
Figure 50 is a schematic view of a pπnter registration protocol, Figure 51 is a schematic view of a Web terminal authorization protocol,
Figure 52 is a schematic view of a Web terminal pnnting protocol, - 5 - Figure 53 is a schematic view of a pen connection protocol,
Figure 54 is a schematic view of a pen registration protocol, and
Figure 55 is a schematic view of a pen data exchange protocol
DETAILED DESCRIPTION OF PREFERRED AND OTHER EMBODIMENTS
Note Memjet™ is a trade mark of Silverbrook Research Pty Ltd, Australia
In the prefened embodiment, the mvention is configured to work with the netpage networked computer system, a detailed overview of which follows It will be appreciated that not every implementation will necessanly embody all or even most of the specific details and extensions discussed below m relation to the basic system However, the system is descnbed m its most complete form to reduce the need for external reference when attempting to understand the context m which the preferred embodiments and aspects of the present mvention operate
In bnef summary, the preferred form of the netpage system employs a computer interface m the form of a mapped surface, that is, a physical surface which contains references to a map of the surface maintained m a computer system The map references can be quened by an appropnate sensmg device Depending upon the specific implementation, the map references may be encoded visibly or invisibly, and defined m such a way that a local query on the mapped surface yields an unambiguous map reference both withm the map and among different maps The computer system can contain information about features on the mapped surface, and such information can be retneved based on map references supplied by a sensmg device used with the mapped surface The information thus retπeved can take the form of actions which are initiated by the computer system on behalf of the operator in response to the operator's interaction with the surface features
In its preferred form, the netpage system relies on the production of, and human interaction with, netpages These are pages of text, graphics and images pnnted on ordinary paper, but which work like mteractive web pages Information is encoded on each page usmg mk which is substantially invisible to the unaided human eye The ink, however, and thereby the coded data, can be sensed by an optically imaging pen and transmitted to the netpage system In the preferred form, active buttons and hyperlinks on each page can be clicked with the pen to request information from the network or to signal preferences to a network server In one embodiment, text wπtten by hand on a netpage is automatically recognized and converted to computer text m the netpage system, allowing forms to be filled m In other embodiments, signatures recorded on a netpage are automatically venfied, allowing e-commerce transactions to be securely authorized As illustrated m Figure 1 , a pπnted netpage 1 can represent a mteractive form which can be filled m by the user both physically, on the printed page, and "electronically", via communication between the pen and the netpage system The example shows a "Request" form containing name and address fields and a submit button The netpage consists of graphic data 2 pnnted usmg visible ink, and coded data 3 pnnted as a collection of tags 4 usmg invisible ink The corresponding page descnption 5, stored on the netpage network, descnbes the mdividual elements of the netpage In particular it descnbes the type and spatial extent (zone) of each mteractive element (I e text field or button m the example), to allow the netpage system to correctly interpret mput via the netpage The submit button 6, for example, has a zone 7 which corresponds to the spatial extent of the corresponding graphic 8
As illustrated m Figure 2, the netpage pen 101, a prefened form of which is shown m Figures 8 and 9 and descnbed m more detail below, works m conjunction with a netpage pnnter 601, an Internet-connected pπnting appliance for home, office or mobile use The pen is wireless and communicates securely with the netpage pnnter via a short-range radio link 9 - 6 - The netpage pπnter 601, a prefened form of which is shown m Figures 11 to 13 and descnbed m more detail below, is able to deliver, peπodically or on demand, personalized newspapers, magazmes, catalogs, brochures and other publications, all pnnted at high quality as mteractive netpages Unlike a personal computer, the netpage pnnter is an appliance which can be, for example, wall-mounted adjacent to an area where the morning news is first consumed, such as m a user's kitchen, near a breakfast table, or near the household's pomt of departure for the day It also comes in tabletop, desktop, portable and miniature versions
Netpages pnnted at their pomt of consumption combme the ease-of-use of paper with the timeliness and interactivity of an mteractive medium
As shown m Figure 2, the netpage pen 101 interacts with the coded data on a pnnted netpage 1 and communicates, via a short-range radio link 9, the interaction to a netpage pπnter The pπnter 601 sends the interaction to the relevant netpage page server 10 for interpretation In appropnate circumstances, the page server sends a coπesponding message to application computer software runnmg on a netpage application server 13 The application server may in turn send a response which is pnnted on the ongmating pπnter
The netpage system is made considerably more convenient m the prefened embodiment by bemg used m conjunction with high-speed microelectromechamcal system (MEMS) based inkjet (Memjet™) pnnters In the prefened form of this technology, relatively high-speed and high-quality pnnting is made more affordable to consumers In its prefened form, a netpage publication has the physical charactenstics of a traditional newsmagazme, such as a set of letter-size glossy pages pnnted m fiill color on both sides, bound together for easy navigation and comfortable handling
The netpage pπnter exploits the growing availability of broadband Internet access Cable service is available to 95% of households m the Umted States, and cable modem service offeπng broadband Internet access is already available to 20% of these The netpage pnnter can also operate with slower connections, but with longer delivery times and lower image quality Indeed, the netpage system can be enabled usmg existing consumer inkjet and laser pπnters, although the system will operate more slowly and will therefore be less acceptable from a consumer's pomt of view In other embodiments, the netpage system is hosted on a pnvate intranet In still other embodiments, the netpage system is hosted on a smgle computer or computer-enabled device, such as a pnnter
Netpage publication servers 14 on the netpage network are configured to deliver print-quality publications to netpage pnnters Penodical publications are delivered automatically to subscnbmg netpage pnnters via pointcasting and multicasting Internet protocols Personalized publications are filtered and formatted according to mdividual user profiles A netpage pnnter can be configured to support any number of pens, and a pen can work with any number of netpage pnnters In the prefened implementation, each netpage pen has a umque identifier A household may have a collection of colored netpage pens, one assigned to each member of the family This allows each user to maintain a distinct profile with respect to a netpage publication server or application server
A netpage pen can also be registered with a netpage registration server 11 and linked to one or more payment card accounts This allows e-commerce payments to be securely authoπzed using the netpage pen The netpage registration server compares the signature captured by the netpage pen with a previously registered signature, allowing it to authenticate the user's identity to an e-commerce server Other biometπcs can also be used to venfy identity A version of the netpage pen mcludes fingerprint scanning, venfied m a similar way by the netpage registration server
Although a netpage pπnter may deliver penodicals such as the morning newspaper without user intervention, it can be configured never to deliver unsolicited junk mail In its preferred form, it only delivers penodicals from subscπbed or otherwise authorized sources In this respect, the netpage pnnter is unlike a fax machine or e-mail - 7 - account which is visible to any junk mailer who knows the telephone number or email address
1 NETPAGE SYSTEM ARCHITECTURE
Each object model m the system is descπbed usmg a Unified Modelmg Language (UML) class diagram A class diagram consists of a set of object classes connected by relationships, and two lands of relationships are of mterest here associations and generalizations An association represents some land of relationship between objects, I e between mstances of classes A generalization relates actual classes, and can be understood m the followmg way if a class is thought of as the set of all objects of that class, and class A is a generalization of class B, then B is simply a subset of A The UML does not directly support second-order modelling - 1 e classes of classes
Each class is drawn as a rectangle labelled with the name of the class It contains a list of the attributes of the class, separated from the name by a horizontal lme, and a list of the operations of the class, separated from the attnbute list by a horizontal lme In the class diagrams which follow, however, operations are never modelled
An association is drawn as a lme joining two classes, optionally labelled at either end with the multiplicity of the association The default multiplicity is one An astensk (*) mdicates a multiplicity of "many", l e zero or more
Each association is optionally labelled with its name, and is also optionally labelled at either end with the role of the coπesponding class An open diamond mdicates an aggregation association ('is-part-of'), and is drawn at the aggregator end of the association lme
A generalization relationship ('is-a") is drawn as a solid lme joining two classes, with an anow (m the form of an open tπangle) at the generalization end
When a class diagram is broken up into multiple diagrams, any class which is duplicated is shown with a dashed outline m all but the mam diagram which defines it It is shown with attπbutes only where it is defined 1.1 NETPAGES
Netpages are the foundation on which a netpage network is built They provide a paper-based user interface to published information and mteractive services
A netpage consists of a pπnted page (or other surface region) invisibly tagged with references to an online descnption of the page The online page descnption is maintained persistently by a netpage page server The page descnption descnbes the visible layout and content of the page, mcludmg text, graphics and images It also descnbes the mput elements on the page, mcludmg buttons, hyperlinks, and mput fields A netpage allows markings made with a netpage pen on its surface to be simultaneously captured and processed by the netpage system
Multiple netpages can share the same page descnption However, to allow mput through otherwise identical pages to be distinguished, each netpage is assigned a umque page identifier This page ID has sufficient precision to distinguish between a very large number of netpages
Each reference to the page descnption is encoded m a pnnted tag The tag identifies the unique page on which it appears, and thereby indirectly identifies the page descnption The tag also identifies its own position on the page Charactenstics of the tags are descπbed m more detail below Tags are pπnted m infrared-absorptive ink on any substrate which is infrared-reflective, such as ordinary paper Near-infrared wavelengths are invisible to the human eye but are easily sensed by a solid-state image sensor with an appropnate filter
A tag is sensed by an area image sensor m the netpage pen, and the tag data is transmitted to the netpage system via the nearest netpage pπnter The pen is wireless and communicates with the netpage pnnter via a short-range radio link Tags are sufficiently small and densely arranged that the pen can reliably image at least one tag even on a smgle click on the page It is important that the pen recognize the page ID and position on every interaction with the - 8 - page, smce the mteraction is stateless Tags are error-conectably encoded to make them partially tolerant to surface damage
The netpage page server maintains a umque page mstance for each pπnted netpage, allowing it to maintain a distinct set of user-supplied values for mput fields m the page descnption for each pπnted netpage The relationship between the page descnption, the page mstance, and the pnnted netpage is shown in
Figure 4 The page mstance is associated with both the netpage pnnter which pnnted it and, if known, the netpage user who requested it
1.2 NETPAGE TAGS
1.2.1 Tag Data Content In a prefened form, each tag identifies the region m which it appears, and the location of that tag withm the region A tag may also contain flags which relate to the region as a whole or to the tag One or more flag bits may, for example, signal a tag sensmg device to provide feedback mdicative of a function associated with the immediate area of the tag, without the sensmg device havmg to refer to a descπption of the region A netpage pen may, for example, illuminate an "active area" LED when m the zone of a hyperlink As will be more clearly explamed below, m a prefened embodiment, each tag contains an easily recognized mvanant structure which aids initial detection, and which assists m minimizing the effect of any warp mduced by the surface or by the sensmg process The tags preferably tile the entire page, and are sufficiently small and densely ananged that the pen can reliably image at least one tag even on a smgle click on the page It is important that the pen recognize the page ID and position on every mteraction with the page, smce the mteraction is stateless In a prefened embodiment, the region to which a tag refers comcides with an entire page, and the region ID encoded m the tag is therefore synonymous with the page ID of the page on which the tag appears In other embodiments, the region to which a tag refers can be an arbitrary subregion of a page or other surface For example, it can comcide with the zone of an mteractive element, m which case the region ID can directly identify the mteractive element Table 1 - Tag data
Each tag contains 120 bits of information, typically allocated as shown m Table 1 Assuming a maximum tag density of 64 per square mch, a 16-bit tag ID supports a region size of up to 1024 square mches Larger regions can be mapped continuously without increasing the tag ID precision simply by usmg abutting regions and maps The 100-bit region ID allows 2100 (— 1030 or a million tnlhon tnllion) different regions to be uniquely identified 1.2.2 Tag Data Encoding
The 120 bits of tag data are redundantly encoded usmg a (15, 5) Reed-Solomon code This yields 360 encoded bits consisting of 6 codewords of 15 4-bit symbols each The (15, 5) code allows up to 5 symbol enors to be conected per codeword, l e it is tolerant of a symbol enor rate of up to 33% per codeword Each 4-bit symbol is represented in a spatially coherent way m the tag, and the symbols of the six - 9 - codewords are mterleaved spatially withm the tag This ensures that a burst enor (an enor affecting multiple spatially adjacent bits) damages a minimum number of symbols overall and a minimum number of symbols m any one codeword, thus maximising the likelihood that the burst enor can be fully conected
1.2.3 Physical Tag Structure The physical representation of the tag, shown m Figure 5, mcludes fixed target structures 15, 16, 17 and vanable data areas 18 The fixed target structures allow a sensmg device such as the netpage pen to detect the tag and infer its three-dimensional onentation relative to the sensor The data areas contain representations of the mdividual bits of the encoded tag data
To achieve proper tag reproduction, the tag is rendered at a resolution of 256x256 dots When pπnted at 1600 dots per mch this yields a tag with a diameter of about 4 mm At this resolution the tag is designed to be surrounded by a "quiet area" of radius 16 dots Since the quiet area is also contnbuted by adjacent tags, it only adds 16 dots to the effective diameter of the tag
The tag mcludes six target structures A detection ring 15 allows the sensmg device to initially detect the tag The πng is easy to detect because it is rotationally mvanant and because a simple conection of its aspect ratio removes most of the effects of perspective distortion An onentation axis 16 allows the sensmg device to determine the approximate planar onentation of the tag due to the yaw of the sensor The onentation axis is skewed to yield a umque onentation Four perspective targets 17 allow the sensmg device to infer an accurate two-dimensional perspective transform of the tag and hence an accurate three-dimensional position and onentation of the tag relative to the sensor
All target structures are redundantly large to improve their immunity to noise The overall tag shape is circular This supports, amongst other things, optimal tag packing on an rrregular tnangular gnd In combination with the circular detection ring, this makes a circular arrangement of data bits within the tag optimal To maximise its size, each data bit is represented by a radial wedge m the form of an area bounded by two radial lmes and two concentnc circular arcs Each wedge has a minimum dimension of 8 dots at 1600 dpi and is designed so that its base (its inner arc), is at least equal to this minimum dimension The height of the wedge m the radial direction is always equal to the minimum dimension Each 4-bit data symbol is represented by an anay of 2x2 wedges
The 15 4-bit data symbols of each of the six codewords are allocated to the four concentnc symbol rings 18a to 18d m mterleaved fashion Symbols are allocated alternately m circular progression around the tag
The mterleavmg is designed to maximise the average spatial distance between any two symbols of the same codeword
In order to support "single-click" mteraction with a tagged region via a sensmg device, the sensmg device must be able to see at least one entire tag m its field of view no matter where m the region or at what onentation it is positioned The required diameter of the field of view of the sensmg device is therefore a function of the size and spacmg of the tags Assuming a circular tag shape, the minimum diameter of the sensor field of view is obtained when the tags are tiled on a equilateral tnangular gnd, as shown m Figure 6
1.2.4 Tag Image Processing and Decoding
The tag image processmg and decoding performed by a sensmg device such as the netpage pen is shown m
Figure 7 While a captured image is bemg acquired from the image sensor, the dynamic range of the image is determined (at 20) The center of the range is then chosen as the binary threshold for the image 21 The image is then thresholded and segmented mto connected pixel regions (I e shapes 23) (at 22) Shapes which are too small to represent - 10 - tag target structures are discarded The size and centroid of each shape is also computed
Binary shape moments 25 are then computed (at 24) for each shape, and these provide the basis for subsequently locating target structures Central shape moments are by their nature mvanant of position, and can be easily made mvanant of scale, aspect ratio and rotation The nng target structure 15 is the first to be located (at 26) A πng has the advantage of bemg very well behaved when perspective-distorted Matching proceeds by aspect-normalizing and rotation-normalizing each shape's moments Once its second-order moments are normalized the πng is easy to recognize even if the perspective distortion was significant The nng's onginal aspect and rotation 27 together provide a useful approximation of the perspective transform The axis target structure 16 is the next to be located (at 28) Matching proceeds by applymg the nng's normalizations to each shape's moments, and rotation-normalizing the resulting moments Once its second-order moments are normalized the axis target is easily recognized Note that one third order moment is required to disambiguate the two possible onentations of the axis The shape is deliberately skewed to one side to make this possible Note also that it is only possible to rotation-normalize the axis target after it has had the nng's normalizations applied, smce the perspective distortion can hide the axis target's axis The axis target's ongmal rotation provides a useful approximation of the tag's rotation due to pen yaw 29
The four perspective target structures 17 are the last to be located (at 30) Good estimates of their positions are computed based on their known spatial relationships to the πng and axis targets, the aspect and rotation of the nng, and the rotation of the axis Matching proceeds by applymg the nng's normalizations to each shape's moments Once their second-order moments are normalized the circular perspective targets are easy to recognize, and the target closest to each estimated position is taken as a match The ongmal centroids of the four perspective targets are then taken to be the perspective-distorted comers 31 of a square of known size m tag space, and an eight-degree-of-freedom perspective transform 33 is infened (at 32) based on solving the well-understood equations relating the four tag-space and image- space pomt pairs (see Heckbert, P , Fundamentals of Texture Mappmg and Image Warping, Masters Thesis, Dept of EECS, U of California at Berkeley, Technical Report No UCB/CSD 89/516, June 1989, the contents of which are herein incorporated by cross-reference)
The infened tag-space to image-space perspective transform is used to project (at 36) each known data bit position m tag space mto image space where the real-valued position is used to bilinearly interpolate (at 36) the four relevant adjacent pixels m the mput image The previously computed image threshold 21 is used to threshold the result to produce the final bit value 37
Once all 360 data bits 37 have been obtained in this way, each of the six 60-bit Reed-Solomon codewords is decoded (at 38) to yield 20 decoded bits 39, or 120 decoded bits m total Note that the codeword symbols are sampled m codeword order, so that codewords are implicitly de-interleaved dunng the sampling process
The nng target 15 is only sought m a subarea of the image whose relationship to the image guarantees that the nng, if found, is part of a complete tag If a complete tag is not found and successfully decoded, then no pen position is recorded for the cuπent frame Given adequate processmg power and ideally a non-minimal field of view 193, an alternative strategy mvolves seeking another tag m the cuπent image
The obtained tag data mdicates the identity of the region containing the tag and the position of the tag within the region An accurate position 35 of the pen nib m the region, as well as the overall onentation 35 of the pen, is then infened (at 34) from the perspective transform 33 observed on the tag and the known spatial relationship between the pen's physical axis and the pen's optical axis - 11 -
1.2.5 Tag Map
Decoding a tag results m a region ID, a tag ID, and a tag-relative pen transform Before the tag ID and the tag-relative pen location can be translated mto an absolute location withm the tagged region, the location of the tag withm the region must be known This is given by a tag map, a function which maps each tag ID m a tagged region to a conespondmg location The tag map class diagram is shown m Figure 22, as part of the netpage pπnter class diagram
A tag map reflects the scheme used to tile the surface region with tags, and this can vary accordmg to surface type When multiple tagged regions share the same tiling scheme and the same tag numbering scheme, they can also share the same tag map
The tag map for a region must be retnevable via the region ID Thus, given a region ID, a tag ID and a pen transform, the tag map can be retneved, the tag ID can be translated mto an absolute tag location withm the region, and the tag-relative pen location can be added to the tag location to yield an absolute pen location withm the region
1.2.6 Tagging Schemes
Two distinct surface coding schemes are of mterest, both of which use the tag structure descnbed earlier in this section The prefened codmg scheme uses "location-indicating" tags as already discussed An alternative codmg scheme uses object-indicating tags
A location-indicating tag contains a tag ID which, when translated through the tag map associated with the tagged region, yields a umque tag location withm the region The tag-relative location of the pen is added to this tag location to yield the location of the pen withm the region This m turn is used to determine the location of the pen relative to a user interface element m the page descnption associated with the region Not only is the user interface element itself identified, but a location relative to the user interface element is identified Location-indicating tags therefore tnvially support the capture of an absolute pen path m the zone of a particular user interface element
An object-indicating tag contains a tag ID which directly identifies a user interface element m the page descnption associated with the region All the tags m the zone of the user interface element identify the user interface element, making them all identical and therefore indistinguishable Object-indicating tags do not, therefore, support the capture of an absolute pen path They do, however, support the capture of a relative pen path So long as the position sampling frequency exceeds twice the encountered tag frequency, the displacement from one sampled pen position to the next within a stroke can be unambiguously determined
With either tagging scheme, the tags function m cooperation with associated visual elements on the netpage as user mteractive elements m that a user can mteract with the pnnted page usmg an appropnate sensmg device m order for tag data to be read by the sensmg device and for an appropnate response to be generated m the netpage system 1.3 DOCUMENT AND PAGE DESCRIPTIONS
A prefened embodiment of a document and page descnption class diagram is shown m Figures 25 and 26
In the netpage system a document is descnbed at three levels At the most abstract level the document 836 has a hierarchical structure whose terminal elements 839 are associated with content objects 840 such as text objects, text style objects, image objects, etc Once the document is pπnted on a pπnter with a particular page size and accordmg to a particular user's scale factor preference, the document is paginated and otherwise formatted Formatted terminal elements 835 will m some cases be associated with content objects which are different from those associated with their conespondmg terminal elements, particularly where the content objects are style-related Each pnnted mstance of a document and page is also descnbed separately, to allow mput captured through a particular page mstance 830 to be recorded separately from mput captured through other mstances of the same page descnption
The presence of the most abstract document descnption on the page server allows a user to request a copy of - 12 - a document without bemg forced to accept the source document's specific format The user may be requesting a copy through a pnnter with a different page size, for example Conversely, the presence of the formatted document descnption on the page server allows the page server to efficiently interpret user actions on a particular pπnted page
A formatted document 834 consists of a set of formatted page descnptions 5, each of which consists of a set of formatted terminal elements 835 Each formatted element has a spatial extent or zone 58 on the page This defines the active area of mput elements such as hyperlinks and mput fields
A document mstance 831 conesponds to a formatted document 834 It consists of a set of page mstances
830, each of which conesponds to a page descnption 5 of the formatted document Each page mstance 830 descnbes a smgle umque pnnted netpage 1 , and records the page ID 50 of the netpage A page mstance is not part of a document mstance if it represents a copy of a page requested m isolation
A page mstance consists of a set of terminal element mstances 832 An element mstance only exists if it records mstance-specific mformation Thus, a hyperlink mstance exists for a hyperlink element because it records a transaction ID 55 which is specific to the page mstance, and a field mstance exists for a field element because it records mput specific to the page mstance An element mstance does not exist, however, for static elements such as textflows A terminal element can be a static element 843, a hyperlink element 844, a field element 845 or a page server command element 846, as shown m Figure 27 A static element 843 can be a style element 847 with an associated style object 854, a textflow element 848 with an associated styled text object 855, an image element 849 with an associated image element 856, a graphic element 850 with an associated graphic object 857, a video clip element 851 with an associated video clip object 858, an audio clip element 852 with an associated audio clip object 859, or a scnpt element 853 with an associated scnpt object 860, as shown m Figure 28
A page mstance has a background field 833 which is used to record any digital ink captured on the page which does not apply to a specific mput element
In the prefened form of the mvention, a tag map 811 is associated with each page mstance to allow tags on the page to be translated mto locations on the page 1.4 THE NETPAGE NETWORK
In a prefened embodiment, a netpage network consists of a distπbuted set of netpage page servers 10, netpage registration servers 11, netpage ID servers 12, netpage application servers 13, netpage publication servers 14, and netpage pπnters 601 connected via a network 19 such as the Internet, as shown m Figure 3
The netpage registration server 11 is a server which records relationships between users, pens, pnnters, applications and publications, and thereby authorizes vanous network activities It authenticates users and acts as a signing proxy on behalf of authenticated users in application transactions It also provides handwnting recognition services As descnbed above, a netpage page server 10 maintains persistent information about page descnptions and page mstances The netpage network mcludes any number of page servers, each handling a subset of page mstances
Smce a page server also maintains user mput values for each page mstance, clients such as netpage pπnters send netpage mput directly to the appropnate page server The page server interprets any such mput relative to the descnption of the conespondmg page
A netpage ID server 12 allocates document IDs 51 on demand, and provides load-balancing of page servers via its ID allocation scheme
A netpage pnnter uses the Internet Distnbuted Name System (DNS), or similar, to resolve a netpage page ID 50 mto the network address of the netpage page server handling the conespondmg page mstance
A netpage application server 13 is a server which hosts mteractive netpage applications A netpage - 13 - pubhcation server 14 is an application server which publishes netpage documents to netpage pnnters They are descnbed m detail m Section 2
Netpage servers can be hosted on a vaπety of network server platforms from manufacturers such as IBM,
Hewlett-Packard, and Sun Multiple netpage servers can run concurrently on a smgle host, and a smgle server can be distnbuted over a number of hosts Some or all of the functionality provided by netpage servers, and m particular the functionality provided by the ID server and the page server, can also be provided directly m a netpage appliance such as a netpage pnnter, m a computer workstation, or on a local network
1.5 THE NETPAGE PRINTER
The netpage pπnter 601 is an appliance which is registered with the netpage system and pnnts netpage documents on demand and via subscnption Each pnnter has a umque pπnter ID 62, and is connected to the netpage network via a network such as the Internet, ideally via a broadband connection
Apart from identity and secunty settings m non-volatile memory, the netpage pnnter contains no persistent storage As far as a user is concerned, "the network is the computer" Netpages function interactively across space and time with the help of the distnbuted netpage page servers 10, independently of particular netpage pnnters The netpage pnnter receives subscnbed netpage documents from netpage publication servers 14 Each document is distnbuted m two parts the page layouts, and the actual text and image objects which populate the pages
Because of personalization, page layouts are typically specific to a particular subscnber and so are pomtcast to the subscnber's pnnter via the appropnate page server Text and image objects, on the other hand, are typically shared with other subscnbers, and so are multicast to all subscnbers' pnnters and the appropnate page servers The netpage publication server optimizes the segmentation of document content mto pointcasts and multicasts After receiving the pomtcast of a document's page layouts, the pnnter knows which multicasts, if any, to listen to
Once the pnnter has received the complete page layouts and objects that define the document to be pnnted, it can pπnt the document The pπnter rasteπzes and pnnts odd and even pages simultaneously on both sides of the sheet It contains duplexed pπnt engme controllers 760 and pnnt engmes utilizing Memjet™ printheads 350 for this purpose
The pnnting process consists of two decoupled stages rasterization of page descnptions, and expansion and pnnting of page images The raster image processor (RIP) consists of one or more standard DSPs 757 running m parallel
The duplexed pnnt engme controllers consist of custom processors which expand, dither and pπnt page images in real time, synchronized with the operation of the printheads m the pπnt engmes
Pnnters not enabled for IR pnnting have the option to pnnt tags usmg IR-absorptive black ink, although this restncts tags to otherwise empty areas of the page Although such pages have more limited functionality than IR-pnnted pages, they are still classed as netpages
A normal netpage pnnter pnnts netpages on sheets of paper More specialised netpage pnnters may pπnt onto more specialised surfaces, such as globes Each pnnter supports at least one surface type, and supports at least one tag tilmg scheme, and hence tag map, for each surface type The tag map 811 which descnbes the tag tilmg scheme actually used to pnnt a document becomes associated with that document so that the document's tags can be conectly interpreted
Figure 2 shows the netpage pnnter class diagram, reflecting printer-related mformation maintained by a registration server 11 on the netpage network
A prefened embodiment of the netpage pπnter is descnbed in greater detail m Section 6 below, with - 14 - ref erence to Figures 11 to 16
1.5.1 Memjet™ Printheads
The netpage system can operate usmg pπnters made with a wide range of digital pnnting technologies, mcludmg thermal inkjet, piezoelectnc Inkjet, laser electrophotographic, and others However, for wide consumer acceptance, it is desirable that a netpage pnnter have the followmg charactenstics
• photographic quality color prmtmg
• high quality text pπnting
• high reliability
• low pπnter cost • low mk cost
• low paper cost
• simple operation
• nearly silent pnnting
• high pnnting speed • simultaneous double sided pπnting
• compact form factor
• low power consumption
No commercially available pnnting technology has all of these charactenstics
To enable to production of pnnters with these charactenstics, the present applicant has mvented a new pπnt technology, refened to as Memjet™ technology Memjet™ is a drop-on-demand inkjet technology that mcorporates pagewidth printheads fabncated usmg microelectromechamcal systems (MEMS) technology Figure 17 shows a smgle pπnting element 300 of a Memjet™ pnnthead The netpage wallpnnter mcorporates 168960 pπnting elements 300 to form a 1600 dpi pagewidth duplex pnnter This pnnter simultaneously pnnts cyan, magenta, yellow, black, and infrared inks as well as paper conditioner and ink fixative The pnnting element 300 is approximately 110 microns long by 32 microns wide Anays of these pnnting elements are formed on a silicon substrate 301 that mcorporates CMOS logic, data transfer, timing, and dnve circuits (not shown)
Major elements of the pnnting element 300 are the nozzle 302, the nozzle nm 303, the nozzle chamber 304, the fluidic seal 305, the ink channel nm 306, the lever arm 307, the active actuator beam pa r 308, the passive actuator beam pair 309, the active actuator anchor 310, the passive actuator anchor 311, and the ink inlet 312
The active actuator beam pair 308 is mechanically joined to the passive actuator beam pair 309 at the jom 319 Both beams pars are anchored at their respective anchor points 310 and 311 The combination of elements 308, 309, 310, 311, and 319 form a cantilevered electrothermal bend actuator 320
Figure 18 shows a small part of an anay of pnnting elements 300, mcludmg a cross section 315 of a pnnting element 300 The cross section 315 is shown without mk, to clearly show the ink inlet 312 that passes through the silicon wafer 301
Figures 19(a), 1 (b) and 19(c) show the operating cycle of a Memjet™ pnnting element 300 Figure 19(a) shows the quiescent position of the ink memscus 316 pnor to pπnting an ink droplet Ink is retained m the nozzle chamber by surface tension at the ink memscus 316 and at the fluidic seal 305 formed between the nozzle chamber 304 and the ink channel nm 306
While pnnting, the pnnthead CMOS circuitry distnbutes data from the pπnt engme controller to the conect - 15 - pnntmg element, latches the data, and buffers the data to dnve the electrodes 318 of the active actuator beam pair 308
This causes an electncal current to pass through the beam pan 308 for about one microsecond, resulting m Joule heating The temperature mcrease resulting from Joule heating causes the beam pair 308 to expand As the passive actuator beam pair 309 is not heated, it does not expand, resulting m a stress difference between the two beam pans This stress difference is partially resolved by the cantilevered end of the electrothermal bend actuator 320 bendmg towards the substrate 301 The lever arm 307 transmits this movement to the nozzle chamber 304 The nozzle chamber
304 moves about two microns to the position shown m Figure 19(b) This mcreases the ink pressure, forcmg ink 321 out of the nozzle 302, and causmg the ink memscus 316 to bulge The nozzle nm 303 prevents the ink memscus 316 from spreading across the surface of the nozzle chamber 304 As the temperature of the beam pairs 308 and 309 equalizes, the actuator 320 returns to its ongmal position This aids m the break-off of the ink droplet 317 from the ink 321 m the nozzle chamber, as shown m Figure 1 (c) The nozzle chamber is refilled by the action of the surface tension at the memscus 316
Figure 20 shows a segment of a pnnthead 350 In a netpage pnnter, the length of the pnnthead is the full width of the paper (typically 210 mm) in the direction 351 The segment shown is 04 mm long (about 02% of a complete pnnthead) When pnnting, the paper is moved past the fixed pnnthead m the direction 352 The pnnthead has 6 rows of interdigitated pnnting elements 300, pnnting the six colors or types of mk supplied by the ink inlets 312
To protect the fragile surface of the pnnthead dunng operation, a nozzle guard wafer 330 is attached to the pnnthead substrate 301 For each nozzle 302 there is a conespondmg nozzle guard hole 331 through which the ink droplets are fired To prevent the nozzle guard holes 331 from becommg blocked by paper fibers or other debns, filtered air is pumped through the air inlets 332 and out of the nozzle guard holes duπng pπnting To prevent ink 321 from drying, the nozzle guard is sealed while the pnnter is idle 1.6 The Netpage Pen
The active sensmg device of the netpage system is typically a pen 101, which, usmg its embedded controller 134, is able to capture and decode IR position tags from a page via an image sensor The image sensor is a solid-state device provided with an appropnate filter to permit sensmg at only near-infrared wavelengths As descnbed in more detail below, the system is able to sense when the nib is m contact with the surface, and the pen is able to sense tags at a sufficient rate to capture human handwnting (l e at 200 dpi or greater and 100 Hz or faster) Information captured by the pen is encrypted and wirelessly transmitted to the pnnter (or base station), the pnnter or base station interpreting the data with respect to the (known) page structure The prefened embodiment of the netpage pen operates both as a normal marking ink pen and as a non- marking stylus The marking aspect, however, is not necessary for usmg the netpage system as a browsing system, such as when it is used as an Internet interface Each netpage pen is registered with the netpage system and has a umque pen ID 61 Figure 23 shows the netpage pen class diagram, reflecting pen-related mformation maintained by a registration server 11 on the netpage network When either mb is m contact with a netpage, the pen determines its position and onentation relative to the page The nib is attached to a force sensor, and the force on the mb is interpreted relative to a threshold to indicate whether the pen is "up" or "down" This allows a mteractive element on the page to be 'clicked' by pressmg with the pen mb, m order to request, say, information from a network Furthermore, the force is captured as a continuous value to allow, say, the full dynamics of a signature to be venfied The pen determines the position and onentation of its mb on the netpage by imaging, m the infrared spectrum, an area 193 of the page m the vicinity of the mb It decodes the nearest tag and computes the position of the - 16 - mb relative to the tag from the observed perspective distortion on the imaged tag and the known geometry of the pen optics Although the position resolution of the tag may be low, because the tag density on the page is mversely proportional to the tag size, the adjusted position resolution is quite high, exceeding the minimum resolution required for accurate handwnting recognition Pen actions relative to a netpage are captured as a senes of strokes A stroke consists of a sequence of time- stamped pen positions on the page, initiated by a pen-down event and completed by the subsequent pen-up event A stroke is also tagged with the page ID 50 of the netpage whenever the page ID changes, which, under normal circumstances, is at the commencement of the stroke
Each netpage pen has a current selection 826 associated with it, allowing the user to perform copy and paste operations etc The selection is timestamped to allow the system to discard it after a defined time penod The current selection descnbes a region of a page mstance It consists of the most recent digital ink stroke captured through the pen relative to the background area of the page It is interpreted m an application-specific manner once it is submitted to an application via a selection hyperlink activation
Each pen has a current mb 824 This is the mb last notified by the pen to the system In the case of the default netpage pen descnbed above, either the marking black ink mb or the non-marking stylus mb is current Each pen also has a current mb style 825 This is the mb style last associated with the pen by an application, e g m response to the user selecting a color from a palette The default mb style is the mb style associated with the cuπent mb Strokes captured through a pen are tagged with the current mb style When the strokes are subsequently reproduced, they are reproduced m the mb style with which they are tagged Whenever the pen is withm range of a pnnter with which it can communicate, the pen slowly flashes its
"online" LED When the pen fails to decode a stroke relative to the page, it momentanly activates its "enor" LED When the pen succeeds m decoding a stroke relative to the page, it momentanly activates its "ok" LED
A sequence of captured strokes is refened to as digital ink Digital ink forms the basis for the digital exchange of drawings and handwnting, for online recognition of handwπting, and for online venfication of signatures The pen is wireless and transmits digital ink to the netpage pnnter via a short-range radio link The transmitted digital ink is encrypted for pnvacy and secunty and packetized for efficient transmission, but is always flushed on a pen-up event to ensure timely handling m the pπnter
When the pen is out-of-range of a pnnter it buffers digital ink m internal memory, which has a capacity of over ten minutes of continuous handwnting When the pen is once again withm range of a pnnter, it transfers any buffered digital ink
A pen can be registered with any number of pnnters, but because all state data resides m netpages both on paper and on the network, it is largely immatenal which pnnter a pen is communicating with at any particular time
A prefened embodiment of the pen is descnbed m greater detail m Section 6 below, with reference to Figures 8 to 10 1.7 NETPAGE INTERACTION
The netpage pnnter 601 receives data relating to a stroke from the pen 101 when the pen is used to interact with a netpage 1 The coded data 3 of the tags 4 is read by the pen when it is used to execute a movement, such as a stroke The data allows the identity of the particular page and associated mteractive element to be determined and an indication of the relative positioning of the pen relative to the page to be obtained The indicating data is transmitted to the pπnter, where it resolves, via the DNS, the page ID 50 of the stroke mto the network address of the netpage page server 10 which maintains the conespondmg page mstance 830 It then transmits the stroke to the page server If the - 17 - page was recently identified m an earlier stroke, then the pnnter may aheady have the address of the relevant page server m its cache Each netpage consists of a compact page layout maintained persistently by a netpage page server (see below) The page layout refers to objects such as images, fonts and pieces of text, typically stored elsewhere on the netpage network When the page server receives the stroke from the pen, it retπeves the page descnption to which the stroke applies, and determines which element of the page descnption the stroke intersects It is then able to interpret the stroke m the context of the type of the relevant element
A "click" is a stroke where the distance and time between the pen down position and the subsequent pen up position are both less than some small maximum An object which is activated by a click typically requires a click to be activated, and accordingly, a longer stroke is ignored The failure of a pen action, such as a "sloppy" click, to register is mdicated by the lack of response from the pen's "ok" LED
There are two kinds of mput elements m a netpage page descπption hyperlinks and form fields Input through a form field can also tngger the activation of an associated hyperlink
1.7.1 Hyperlinks A hyperlink is a means of sendmg a message to a remote application, and typically elicits a pπnted response m the netpage system
A hyperlink element 844 identifies the application 71 which handles activation of the hyperlink, a link ID
54 which identifies the hyperlink to the application, an "alias required" flag which asks the system to mclude the user's application alias ID 65 m the hyperlink activation, and a descπption which is used when the hyperlink is recorded as a favonte or appears m the user's history The hyperlink element class diagram is shown m Figure 29
When a hyperlink is activated, the page server sends a request to an application somewhere on the network
The application is identified by an application ID 64, and the application ID is resolved m the normal way via the DNS
There are three types of hyperlinks general hyperlinks 863, form hyperlinks 865, and selection hyperlinks 864, as shown m Figure 30 A general hyperlink can implement a request for a linked document, or may simply signal a preference to a server A form hyperlink submits the conespondmg form to the application A selection hyperlink submits the cuπent selection to the application If the current selection contains a smgle-word piece of text, for example, the application may return a smgle-page document giving the word's meaning withm the context m which it appears, or a translation mto a different language Each hyperlink type is characterized by what information is submitted to the application The conespondmg hyperlink mstance 862 records a transaction ID 55 which can be specific to the page mstance on which the hyperlink mstance appears The transaction ID can identify user-specific data to the application, for example a "shopping cart" of pending purchases maintained by a purchasing application on behalf of the user
The system mcludes the pen's current selection 826 m a selection hyperlink activation The system mcludes the content of the associated form mstance 868 m a form hyperlink activation, although if the hyperlink has its "submit delta" attπbute set, only mput smce the last form submission is mcluded The system mcludes an effective return path m all hyperlink activations
A hyperhnked group 866 is a group element 838 which has an associated hyperlink, as shown m Figure 31
When mput occurs through any field element m the group, the hyperlink 844 associated with the group is activated A hyperlinked group can be used to associate hyperlink behavior with a field such as a checkbox It can also be used, m conjunction with the "submit delta" attnbute of a form hyperlink, to provide continuous mput to an application It can therefore be used to support a "blackboard" mteraction model, l e where mput is captured and therefore shared as soon - 18 - as it occurs
1.7.2 Forms
A form defines a collection of related mput fields used to capture a related set of mputs through a pnnted netpage A form allows a user to submit one or more parameters to an application software program running on a server A form 867 is a group element 838 m the document hierarchy It ultimately contains a set of terminal field elements 839 A form mstance 868 represents a pnnted mstance of a form It consists of a set of field mstances 870 which conespond to the field elements 845 of the foπn Each field mstance has an associated value 871, whose type depends on the type of the conespondmg field element Each field value records mput through a particular pnnted form mstance, l e through one or more pnnted netpages The form class diagram is shown m Figure 32 Each form mstance has a status 872 which mdicates whether the form is active, frozen, submitted, void or expned A form is active when first pnnted A form becomes frozen once it is signed A form becomes submitted once one of its submission hyperlinks has been activated, unless the hyperlink has its "submit delta" attnbute set A form becomes void when the user mvokes a void form, reset form or duplicate form page command A form expires when the time the form has been active exceeds the form's specified lifetime While the form is active, form mput is allowed Input through a form which is not active is mstead captured m the background field 833 of the relevant page mstance
When the form is active or frozen, form submission is allowed Any attempt to submit a form when the form is not active or frozen is rejected, and mstead elicits an form status report
Each form mstance is associated (at 59) with any form mstances denved from it, thus providing a version history This allows all but the latest version of a form m a particular time penod to be excluded from a search All mput is captured as digital ink Digital ink 873 consists of a set of timestamped stroke groups 874, each of which consists of a set of styled strokes 875 Each stroke consists of a set of timestamped pen positions 876, each of which also mcludes pen onentation and mb force The digital ink class diagram is shown m Figure 33
A field element 845 can be a checkbox field 877, a text field 878, a drawing field 879, or a signature field 880 The field element class diagram is shown m Figure 34 Any digital ink captured m a field's zone 58 is assigned to the field
A checkbox field has an associated boolean value 881, as shown m Figure 35 Any mark (a tick, a cross, a stroke, a fill zigzag, etc ) captured m a checkbox field's zone causes a true value to be assigned to the field's value
A text field has an associated text value 882, as shown m Figure 36 Any digital ink captured m a text field's zone is automatically converted to text via online handwπting recognition, and the text is assigned to the field's value Online handwnting recognition is well-understood (see, for example, Tappert, C , C Y Suen and T Wakahara,
"The State of the Art m On-Line Handwπting Recognition", IEEE Transactions on Pattern Analysis and Machine
Intelligence, Vol 12, No 8, August 1990, the contents of which are herein incorporated by cross-reference)
A signature field has an associated digital signature value 883, as shown m Figure 37 Any digital ink captured m a signature field's zone is automatically venfied with respect to the identity of the owner of the pen, and a digital signature of the content of the form of which the field is part is generated and assigned to the field's value The digital signature is generated usmg the pen user's pnvate signature key specific to the application which owns the form Online signature venfication is well-understood (see, for example, Plamondon, R and G Lorette, "Automatic Signature Venfication and Wπter Identification - The State of the Art", Pattern Recognition, Vol 22, No 2, 1989, the contents of which are herem incorporated by cross-reference) A field element is hidden if its "hidden" attnbute is set A hidden field element does not have an mput zone on a page and does not accept mput It can have an associated field value which is mcluded m the form data when the - 19 - form contaimng the field is submitted
"Editing" commands, such as stπke-throughs indicating deletion, can also be recognized m form fields
Because the handwnting recognition algonthm works "online" (I e with access to the dynamics of the pen movement), rather than "offline" (I e with access only to a bitmap of pen markings), it can recognize run-on discretely- wntten characters with relatively high accuracy, without a wnter-dependent training phase A wnter-dependent model of handwnting is automatically generated over time, however, and can be generated up-front if necessary,
Digital ink, as already stated, consists of a sequence of strokes Any stroke which starts m a particular element's zone is appended to that element's digital ink stream, ready for mterpretation Any stroke not appended to an object's digital ink stream is appended to the background field's digital ink stream
Digital ink captured m the background field is mterpreted as a selection gesture Cncumscnption of one or more objects is generally mterpreted as a selection of the circumscnbed objects, although the actual mterpretation is application-specific
Table 2 summanses these vanous pen interactions with a netpage
Table 2 - Summary of pen interactions with a netpage
Figure imgf000022_0001
The system maintains a current selection for each pen The selection consists simply of the most recent stroke captured m the background field The selection is cleared after an inactivity timeout to ensure predictable behavior The raw digital ink captured m every field is retained on the netpage page server and is optionally transmitted with the form data when the form is submitted to the application This allows the application to mtenogate the raw digital ink should it suspect the onginal conversion, such as the conversion of handwntten text This can, for example, mvolve human intervention at the application level for forms which fail certain application-specific consistency checks As an extension to this, the entire background area of a form can be designated as a drawing field The application can then decide, on the basis of the presence of digital ink outside the explicit fields of the form, to route the form to a human operator, on the assumption that the user may have indicated amendments to the filled-in fields outside of those fields
Figure 38 shows a flowchart of the process of handling pen mput relative to a netpage The process consists of receiving (at 884) a stroke from the pen, identifying (at 885) the page mstance 830 to which the page ID 50 in the stroke refers, retnevmg (at 886) the page descnption 5, identifying (at 887) a formatted element 839 whose zone 58 the - 20 - stroke mtersects, determining (at 888) whether the formatted element conesponds to a field element, and if so appendmg (at 892) the received stroke to the digital ink of the field value 871, mterpretmg (at 893) the accumulated digital ink of the field, and determining (at 894) whether the field is part of a hyperlinked group 866 and if so activating
(at 895) the associated hyperlink, alternatively determinmg (at 889) whether the formatted element conesponds to a hyperlink element and if so activating (at 895) the conespondmg hyperlink, alternatively, m the absence of an mput field or hyperlink, appending (at 890) the received stroke to the digital ink of the background field 833, and copymg (at
891) the received stroke to the current selection 826 of the current pen, as maintained by the registration server
Figure 38a shows a detailed flowchart of step 893 m the process shown m Figure 38, where the accumulated digital ink of a field is mterpreted accordmg to the type of the field The process consists of determinmg (at 896) whether the field is a checkbox and (at 897) whether the digital ink represents a checkmark, and if so assigning (at 898) a true value to the field value, alternatively determinmg (at 899) whether the field is a text field and if so converting (at 900) the digital ink to computer text, with the help of the appropnate registration server, and assigning (at 901) the converted computer text to the field value, alternatively determinmg (at 902) whether the field is a signature field and if so venfymg (at 903) the digital ink as the signature of the pen's owner, with the help of the appropnate registration server, creating (at 904) a digital signature of the contents of the conespondmg form, also with the help of the registration server and usmg the pen owner's pnvate signature key relating to the conespondmg application, and assigning (at 905) the digital signature to the field value 1.7.3 Page Server Commands
A page server command is a command which is handled locally by the page server It operates directly on form, page and document mstances
A page server command 907 can be a void form command 908, a duplicate form command 909, a reset form command 910, a get form status command 911, a duplicate page command 912, a reset page command 913, a get page status command 914, a duplicate document command 915, a reset document command 916, or a get document status command 917, as shown m Figure 39 A void form command voids the conespondmg form mstance A duplicate form command voids the conespondmg form mstance and then produces an active pnnted copy of the current form mstance with field values preserved The copy contains the same hyperlink transaction IDs as the onginal, and so is indistinguishable from the ongmal to an application A reset form command voids the conespondmg form mstance and then produces an active prmted copy of the form mstance with field values discarded A get form status command produces a pnnted report on the status of the conespondmg form mstance, mcludmg who published it, when it was pπnted, for whom it was printed, and the form status of the form mstance
Since a form hyperlink mstance contains a transaction ID, the application has to be mvolved m producmg a new form mstance A button requesting a new form mstance is therefore typically implemented as a hyperlink.
A duplicate page command produces a pnnted copy of the conespondmg page instance with the background field value preserved If the page contains a form or is part of a form, then the duplicate page command is mterpreted as a duplicate form command A reset page command produces a pnnted copy of the conespondmg page mstance with the background field value discarded If the page contains a form or is part of a form, then the reset page command is mterpreted as a reset form command A get page status command produces a pπnted report on the status of the conespondmg page mstance, mcludmg who published it, when it was pπnted, for whom it was pnnted, and the status of any forms it contains or is part of
The netpage logo which appears on every netpage is usually associated with a duplicate page element - 21 - When a page mstance is duplicated with field values preserved, field values are pnnted m then native form, l e a checkmark appears as a standard checkmark graphic, and text appears as typeset text Only drawings and signatures appear m their ongmal form, with a signature accompanied by a standard graphic indicating successful signature venfication A duplicate document command produces a pπnted copy of the conespondmg document mstance with background field values preserved If the document contams any forms, then the duplicate document command duplicates the forms m the same way a duplicate form command does A reset document command produces a pnnted copy of the conespondmg document mstance with background field values discarded If the document contams any forms, then the reset document command resets the forms m the same way a reset form command does A get document status command produces a pnnted report on the status of the conespondmg document mstance, mcludmg who published it, when it was pnnted, for whom it was pnnted, and the status of any forms it contams
If the page server command's "on selected" attnbute is set, then the command operates on the page identified by the pen's current selection rather than on the page containing the command This allows a menu of page server commands to be pnnted If the target page doesn't contain a page server command element for the designated page server command, then the command is ignored
An application can provide application-specific handling by embeddmg the relevant page server command element m a hyperlinked group The page server activates the hyperlink associated with the hyperlinked group rather than executing the page server command
A page server command element is hidden if its "hidden" attnbute is set A hidden command element does not have an input zone on a page and so cannot be activated directly by a user It can, however, be activated via a page server command embedded in a different page, if that page server command has its "on selected" attπbute set
1.8 STANDARD FEATURES OF NETPAGES
In the prefened form, each netpage is pnnted with the netpage logo at the bottom to indicate that it is a netpage and therefore has mteractive properties The logo also acts as a copy button In most cases pressing the logo produces a copy of the page In the case of a form, the button produces a copy of the entire form And m the case of a secure document, such as a ticket or coupon, the button elicits an explanatory note or advertising page
The default smgle-page copy function is handled directly by the relevant netpage page server Special copy functions are handled by linking the logo button to an application
1.9 USER HELP SYSTEM In a prefened embodiment, the netpage pnnter has a smgle button labelled "Help" When pressed it elicits a smgle page of information, mcludmg
• status of pπnter connection
• status of pπnter consumables
• top-level help menu • document function menu
• top-level netpage network directory
The help menu provides a hierarchical manual on how to use the netpage system The document function menu mcludes the followmg functions
• pnnt a copy of a document • pnnt a clean copy of a form
• pπnt the status of a document - 22 -
A document function is initiated by simply pressmg the button and then touching any page of the document
The status of a document mdicates who published it and when, to whom it was delivered, and to whom and when it was subsequently submitted as a form
The netpage network directory allows the user to navigate the hierarchy of publications and services on the network As an alternative, the user can call the netpage network "900" number "yellow pages" and speak to a human operator The operator can locate the desned document and route it to the user's pnnter Depending on the document type, the publisher or the user pays the small "yellow pages" service fee
The help page is obviously unavailable if the pnnter is unable to pnnt In this case the "enor" light is lit and the user can request remote diagnosis over the network 2 PERSONALIZED PUBLICATION MODEL
In the followmg descπption, news is used as a canonical publication example to illustrate personalization mechanisms m the netpage system Although news is often used m the limited sense of newspaper and newsmagazme news, the mtended scope m the present context is wider
In the netpage system, the editonal content and the advertising content of a news publication are personalized usmg different mechamsms The editonal content is personalized accordmg to the reader's explicitly stated and implicitly captured mterest profile The advertising content is personalized according to the reader's locality and demographic 2.1 EDITORIAL PERSONALIZATION
A subscnber can draw on two lands of news sources those that deliver news publications, and those that deliver news streams While news publications are aggregated and edited by the publisher, news streams are aggregated either by a news publisher or by a specialized news aggregator News publications typicallv conespond to traditional newspapers and newsmagazines, while news streams can be many and vaned a "raw" news feed from a news service, a cartoon stnp, a freelance wnter's column, a friend's bulletin board, or the reader's own e-mail
The netpage publication server supports the publication of edited news publications as well as the aggregation of multiple news streams By handling the aggregation and hence the formatting of news streams selected directly by the reader, the server is able to place advertising on pages over which it otherwise has no editonal control
The subscnber builds a daily newspaper by selecting one or more contnbuting news publications, and creating a personalized version of each The resulting daily editions are pnnted and bound together mto a smgle newspaper The vanous members of a household typically express their different mterests and tastes by selecting different daily publications and then customizing them
For each publication, the reader optionally selects specific sections Some sections appear daily, while others appear weekly The daily sections available from The New York Times online, for example, mclude "Page One Plus", "National", "International", "Opinion", "Business", "Arts/Living", "Technology", and "Sports" The set of available sections is specific to a publication, as is the default subset The reader can extend the daily newspaper by creating custom sections, each one drawing on any number of news streams Custom sections might be created for e-mail and friends' announcements ("Personal"), or for monitoring news feeds for specific topics ("Alerts" or "Clippings")
For each section, the reader optionally specifies its size, either qualitatively (e g short, medium, or long), or numencally (I e as a limit on its number of pages), and the desired proportion of advertising, either qualitatively (e g high, normal, low, none), or numeπcally (l e as a percentage)
The reader also optionally expresses a preference for a large number of shorter articles or a small number of - 23 - longer articles Each article is ideally wntten (or edited) in both short and long forms to support this preference
An article may also be wntten (or edited) m different versions to match the expected sophistication of the reader, for example to provide children's and adults' versions The appropnate version is selected accordmg to the reader's age The reader can specify a "reading age" which takes precedence over then biological age The articles which make up each section are selected and pnontized by the editors, and each is assigned a useful lifetime By default they are delivered to all relevant subscnbers, m pnonty order, subject to space constraints m the subscnbers' editions
In sections where it is appropnate, the reader may optionally enable collaborative filtenng This is then applied to articles which have a sufficiently long lifetime Each article which qualifies for collaborative filtenng is pπnted with ratmg buttons at the end of the article The buttons can provide an easy choice (e g "liked" and "disliked'), making it more likely that readers will bother to rate the article
Articles with high pnonties and short lifetimes are therefore effectively considered essential readmg by the editors and are delivered to most relevant subscπbers
The reader optionally specifies a serendipity factor, either qualitatively (e g do or don't surpnse me), or numencally A high serendipity factor lowers the threshold used for matchmg duπng collaborative filtenng A high factor makes it more likely that the conespondmg section will be filled to the reader's specified capacity A different serendipity factor can be specified for different days of the week
The reader also optionally specifies topics of particular mterest withm a section, and this modifies the pnonties assigned by the editors The speed of the reader's Internet connection affects the quality at which images can be delivered The reader optionally specifies a preference for fewer images or smaller images or both If the number or size of images is not reduced, then images may be delivered at lower quality (I e at lower resolution or with greater compression)
At a global level, the reader specifies how quantities, dates, times and monetary values are localized This involves specifying whether units are impenal or metnc, a local trmezone and time format, and a local currency, and whether the localization consist of in situ translation or annotation These preferences are denved from the reader's locality by default
To reduce reading difficulties caused by poor eyesight, the reader optionally specifies a global preference for a larger presentation Both text and images are scaled accordingly, and less mformation is accommodated on each page The language m which a news publication is published, and its conespondmg text encoding, is a property of the publication and not a preference expressed by the user However, the netpage system can be configured to provide automatic translation services m vanous guises
2.2 ADVERTISING LOCALIZATION AND TARGETING
The personalization of the editonal content directly affects the advertising content, because advertising is typically placed to exploit the editonal context Travel ads, for example, are more likely to appear m a travel section than elsewhere The value of the editonal content to an advertiser (and therefore to the publisher) lies m its ability to attract large numbers of readers with the πght demographics
Effective advertising is placed on the basis of locality and demographics Locality determines proximity to particular services, retailers etc , and particular interests and concerns associated with the local community and environment Demographics determine general interests and preoccupations as well as likely spending patterns
A news publisher's most profitable product is advertising "space", a multi-dimensional entity determined by - 24 - the publication's geographic coverage, the size of its readership, its readership demographics, and the page area available for advertismg
In the netpage system, the netpage publication server computes the approximate multi-dimensional size of a publication's saleable advertismg space on a per-section basis, taking mto account the publication's geographic coverage, the section's readership, the size of each reader's section edition, each reader's advertismg proportion, and each reader's demographic
In compaπson with other media, the netpage system allows the advertismg space to be defined m greater detail, and allows smaller pieces of it to be sold separately It therefore allows it to be sold at closer to its true value
For example, the same advertismg "slot" can be sold m varying proportions to several advertisers, with mdividual readers' pages randomly receivmg the advertisement of one advertiser or another, overall preserving the proportion of space sold to each advertiser
The netpage system allows advertismg to be linked directly to detailed product information and online purchasing It therefore raises the intrinsic value of the advertismg space
Because personalization and localization are handled automatically by netpage publication servers, an advertismg aggregator can provide arbitranly broad coverage of both geography and demographics The subsequent disaggregation is efficient because it is automatic This makes it more cost-effective for publishers to deal with advertismg aggregators than to directly capture advertismg Even though the advertismg aggregator is taking a proportion of advertismg revenue, publishers may find the change profit-neutral because of the greater efficiency of aggregation The advertising aggregator acts as an intermediary between advertisers and publishers, and may place the same advertisement m multiple publications
It is worth noting that ad placement m a netpage publication can be more complex than ad placement m the publication's traditional counterpart, because the publication's advertismg space is more complex While ignoring the full complexities of negotiations between advertisers, advertismg aggregators and publishers, the prefened form of the netpage system provides some automated support for these negotiations, mcludmg support for automated auctions of advertismg space Automation is particularly desirable for the placement of advertisements which generate small amounts of mcome, such as small or highly localized advertisements
Once placement has been negotiated, the aggregator captures and edits the advertisement and records it on a netpage ad server Conespondingly, the publisher records the ad placement on the relevant netpage publication server
When the netpage publication server lays out each user's personalized publication, it picks the relevant advertisements from the netpage ad server
2.3 USER PROFILES
2.3.1 Information Filtering
The personalization of news and other publications relies on an assortment of user-specific profile information, mcludmg • publication customizations
• collaborative filteπng vectors
• contact details
• presentation preferences
The customization of a publication is typically publication-specific, and so the customization mformation is maintained by the relevant netpage publication server
A collaborative filtenng vector consists of the user's ratings of a number of news items It is used to - 25 - conelate different users' mterests for the purposes of making recommendations Although there are benefits to mamtammg a smgle collaborative filtenng vector mdependently of any particular publication, there are two reasons why it is more practical to maintain a separate vector for each publication there is likely to be more overlap between the vectors of subscnbers to the same publication than between those of subscπbers to different publications, and a publication is likely to want to present its users' collaborative filtenng vectors as part of the value of its brand, not to be found elsewhere Collaborative filtenng vectors are therefore also maintained by the relevant netpage publication server
Contact details, mcludmg name, street address, ZIP Code, state, country, telephone numbers, are global by nature, and are maintained by a netpage registration server
Presentation preferences, mcludmg those for quantities, dates and times, are likewise global and maintained m the same way
The localization of advertismg relies on the locality mdicated m the user's contact details, while the targeting of advertismg relies on personal information such as date of birth, gender, mantal status, income, profession, education, or qualitative denvatives such as age range and mcome range
For those users who choose to reveal personal information for advertismg purposes, the information is maintained by the relevant netpage registration server In the absence of such information, advertismg can be targeted on the basis of the demographic associated with the user's ZIP or ZIP+4 Code
Each user, pen, pπnter, application provider and application is assigned its own unique identifier, and the netpage registration server maintains the relationships between them, as shown m Figures 21, 22, 23 and 24 For registration purposes, a publisher is a special land of application provider, and a publication is a special land of application
Each user 800 may be authorized to use any number of pπnters 802, and each pπnter may allow any number of users to use it Each user has a smgle default pπnter (at 66), to which penodical publications are delivered by default, whilst pages pnnted on demand are delivered to the pπnter through which the user is interacting The server keeps track of which publishers a user has authoπzed to pnnt to the user's default pπnter A publisher does not record the ID of any particular pπnter, but mstead resolves the ID when it is required
When a user subscnbes 808 to a publication 807, the publisher 806 (l e application provider 803) is authoπzed to pπnt to a specified pπnter or the user's default pnnter This authorization can be revoked at any time by the user Each user may have several pens 801, but a pen is specific to a smgle user If a user is authoπzed to use a particular pnnter, then that pnnter recognizes any of the user's pens The pen ID is used to locate the conespondmg user profile maintained by a particular netpage registration server, via the DNS m the usual way
A Web terminal 809 can be authorized to pnnt on a particular netpage pnnter, allowing Web pages and netpage documents encountered dunng Web browsmg to be conveniently pnnted on the nearest netpage pπnter
The netpage system can collect, on behalf of a pπnter provider, fees and commissions on mcome earned through publications pnnted on the provider's pnnters Such mcome can mclude advertismg fees, click-through fees, e- commerce commissions, and transaction fees If the pnnter is owned by the user, then the user is the pnnter provider
Each user also has a netpage account 820 which is used to accumulate micro-debits and credits (such as those descnbed m the preceding paragraph), contact details 815, mcludmg name, address and telephone numbers, global preferences 816, mcludmg pπvacy, delivery and localization settings, any number of biometnc records 817, containing the user's encoded signature 818, fingerprint 819 etc, a handwnting model 819 automatically maintained by the system, and SET payment card accounts 821 with which e-commerce payments can be made - 26 - 2.3.2 Favorites List
A netpage user can maintain a list 922 of "favoπtes" - links to useful documents etc on the netpage network The list is mamtamed by the system on the user's behalf It is organized as a hierarchy of folders 924, a prefemed embodiment of which is shown m the class diagram m Figure 41 2.3.3 History List
The system maintains a history list 929 on each user's behalf, containing links to documents etc accessed by the user through the netpage system It is organized as a date-ordered list, a prefened embodiment of which is shown m the class diagram m Figure 42
2.4 INTELLIGENT PAGE LAYOUT The netpage publication server automatically lays out the pages of each user's personalized publication on a section-by-section basis Smce most advertisements are m the form of pre-formatted rectangles, they are placed on the page before the editonal content
The advertismg ratio for a section can be achieved with wildly varying advertismg ratios on mdividual pages withm the section, and the ad layout algonthm exploits this The algonthm is configured to attempt to co-locate closely tied editonal and advertismg content, such as plac g ads for roofing matenal specifically withm the publication because of a special feature on do-it-yourself roofing repairs
The editonal content selected for the user, mcludmg text and associated images and graphics, is then laid out according to vanous aesthetic rules
The entire process, mcludmg the selection of ads and the selection of editonal content, must be iterated once the layout has converged, to attempt to more closely achieve the user's stated section size preference The section size preference can, however, be matched on average over time, allowing significant day-to-day vanations
2.5 DOCUMENT FORMAT
Once the document is laid out, it is encoded for efficient distπbution and persistent storage on the netpage network The primary efficiency mechanism is the separation of information specific to a smgle user's edition and information shared between multiple users' editions The specific information consists of the page layout The shared information consists of the objects to which the page layout refers, mcludmg images, graphics, and pieces of text
A text object contams fully-formatted text represented m the Extensible Markup Language (XML) usmg the Extensible Stylesheet Language (XSL) XSL provides precise control over text formatting mdependently of the region mto which the text is bemg set, which m this case is bemg provided by the layout The text object contams embedded language codes to enable automatic translation, and embedded hyphenation hints to aid with paragraph formatting
An image object encodes an image m the JPEG 2000 wavelet-based compressed image format A graphic object encodes a 2D graphic in Scalable Vector Graphics (SVG) format
The layout itself consists of a senes of placed image and graphic objects, linked textflow objects through which text objects flow, hyperlinks and mput fields as descnbed above, and watermark regions These layout objects are summarized m Table 3 The layout uses a compact format suitable for efficient distnbution and storage
Table 3 - netpage layout objects
Figure imgf000029_0001
- 27 -
Figure imgf000030_0001
2.6 DOCUMENT DISTRIBUTION
As described above, for purposes of efficient distribution and persistent storage on the netpage network, a user-specific page layout is separated from the shared objects to which it refers. When a subscribed publication is ready to be distributed, the netpage publication server allocates, with the help of the netpage ID server 12, a unique ID for each page, page instance, document, and document instance.
The server computes a set of optimized subsets of the shared content and creates a multicast channel for each subset, and then tags each user-specific layout with the names of the multicast channels which will cany the shared content used by that layout. The server then pointcasts each user's layouts to that user's printer via the appropriate page server, and when the pointcasting is complete, multicasts the shared content on the specified channels. After receiving its pointcast, each page server and printer subscribes to the multicast channels specified in the page layouts. During the multicasts, each page server and printer extracts from the multicast streams those objects refened to by its page layouts. The page servers persistently archive the received page layouts and shared content.
Once a printer has received all the objects to which its page layouts refer, the printer re-creates the fully- populated layout and then rasterizes and prints it.
Under normal circumstances, the printer prints pages faster than they can be delivered. Assuming a quarter of each page is covered with images, the average page has a size of less than 400KB. The printer can therefore hold in excess of 100 such pages in its internal 64MB memory, allowing for temporary buffers etc. The printer prints at a rate of one page per second. This is equivalent to 400KB or about 3Mbit of page data per second, which is similar to the highest expected rate of page data delivery over a broadband network.
Even under abnormal circumstances, such as when the printer runs out of paper, it is likely that the user will be able to replenish the paper supply before the printer's 100-page internal storage capacity is exhausted.
However, if the printer's internal memory does fill up, then the printer will be unable to make use of a multicast when it first occurs. The netpage publication server therefore allows printers to submit requests for re- multicasts. When a critical number of requests is received or a timeout occurs, the server re-multicasts the conespondmg shared objects.
Once a document is printed, a printer can produce an exact duplicate at any time by retrieving its page - 28 - layouts and contents from the relevant page server
2.7 ON-DEMAND DOCUMENTS
When a netpage document is requested on demand, it can be personalized and delivered m much the same way as a penodical However, smce there is no shared content, delivery is made directly to the requesting pnnter without the use of multicast
When a non-netpage document is requested on demand, it is not personalized, and it is delivered via a designated netpage formatting server which reformats it as a netpage document A netpage formatting server is a special mstance of a netpage publication server The netpage formatting server has knowledge of vanous Internet document formats, mcludmg Adobe's Portable Document Format (PDF), and Hypertext Markup Language (HTML) In the case of HTML, it can make use of the higher resolution of the pπnted page to present Web pages m a multi-column format, with a table of contents It can automatically mclude all Web pages directly linked to the requested page The user can tune this behavior via a preference
The netpage formatting server makes standard netpage behavior, mcludmg interactivity and persistence, available on any Internet document, no matter what its ongm and format It hides knowledge of different document formats from both the netpage pπnter and the netpage page server, and hides knowledge of the netpage system from Web servers 3 SECURITY
3.1 CRYPTOGRAPHY
Cryptography is used to protect sensitive information, both m storage and m transit, and to authenticate parties to a transaction There are two classes of cryptography m widespread use secret-key cryptography and public-key cryptography The netpage network uses both classes of cryptography
Secret-key cryptography, also refened to as symmetnc cryptography, uses the same key to encrypt and decrypt a message Two parties wishing to exchange messages must first anange to securely exchange the secret key
Public-key cryptography, also refened to as asymmetnc cryptography, uses two encryption keys The two keys are mathematically related m such a way that any message encrypted usmg one key can only be decrypted usmg the other key One of these keys is then published, while the other is kept pnvate The public key is used to encrypt any message mtended for the holder of the pnvate key Once encrypted usmg the public key, a message can only be decrypted usmg the pnvate key Thus two parties can securely exchange messages without first having to exchange a secret key To ensure that the pnvate key is secure, it is normal for the holder of the pnvate key to generate the key pair Public-key cryptography can be used to create a digital signature The holder of the pnvate key can create a known hash of a message and then encrypt the hash usmg the pnvate key Anyone can then venfy that the encrypted hash constitutes the "signature" of the holder of the pnvate key with respect to that particular message by decrypting the encrypted hash usmg the public key and venfymg the hash against the message If the signature is appended to the message, then the recipient of the message can venfy both that the message is genume and that it has not been altered m transit
To make public-key cryptography work, there has to be a way to distnbute public keys which prevents impersonation This is normally done usmg certificates and certificate authonties A certificate authonty is a trusted third party which authenticates the connection between a public key and someone's identity The certificate authonty venfies the person's identity by examining identity documents, and then creates and signs a digital certificate containing the person's identity details and public key Anyone who trusts the certificate authonty can use the public key m the certificate with a high degree of certamty that it is genume They just have to venfy that the certificate has mdeed been - 29 - signed by the certificate authonty, whose public key is well-known
In most transaction environments, public-key cryptography is only used to create digital signatures and to securely exchange secret session keys Secret-key cryptography is used for all other purposes
In the followmg discussion, when reference is made to the secure transmission of information between a netpage pπnter and a server, what actually happens is that the pnnter obtains the server's certificate, authenticates it with reference to the certificate authonty, uses the public key-exchange key m the certificate to exchange a secret session key with the server, and then uses the secret session key to encrypt the message data A session key, by definition, can have an arbitranly short lifetime
3.2 NETPAGE PRINTER SECURITY Each netpage pnnter is assigned a pair of umque identifiers at tune of manufacture which are stored m read-only memory m the pnnter and m the netpage registration server database The pnnter ID 62 is public and umquely identifies the pnnter on the netpage network The secret ID 90 is secret and is used when the pnnter is first registered on the network
A prefened embodiment of a pnnter registration protocol is shown m Figure 50 Accordmg to the protocol, when the pnnter connects to the netpage network for the first time after mstallation, it creates a signature public/pnvate key pan 91 ,92 It transmits the secret ID and the public key 91 securely to the netpage registration server 11 The server compares the secret ID agamst the pnnter' s secret ID recorded m its database 74, and accepts the registration if the IDs match It then creates and signs a certificate containing the pnnter' s public ID and public signature key, and stores the certificate m the registration database The pnnter stores its pnvate key 92 m its flash memory 81 When the pπnter needs to exchange a session key with a server, it generates a random session key, signs it usmg its pnvate signature key 92, and securely transmits the session key to the server, I e encrypted usmg the server's public key-exchange key from the server's certificate The server venfies that the pnnter is a registered netpage pnnter by venfymg the signature usmg the pnnter' s public signature key from the pnnter' s certificate, available from the registration server The netpage registration server can act as a certificate authonty for the pnnter smce it has pnveleged access to secret information allowing it to venfy pnnter identity
As an alternative to the pπnter generating the signature public/pnvate key pair when it registers, the pnvate key 92 can be stored m the pnnter' s ROM at time of manufacture and the matchmg public key 91 stored m the registration server database at time of manufacture, obviating the need for the secret ID 90
As another alternative, pnnter registration can utilize the same technique used for pen registration, as descnbed below
3.2.1 Publisher Authorization
When a user subscnbes to a publication, a record 808 is created m the netpage registration server database authorizing the publisher to pnnt the publication to the user's default pnnter or a specified pnnter Every document 836 sent to a pnnter via a page server is addressed to a particular user, via the user's alias ID 65 with respect to the publisher, and is signed by the publisher usmg the publisher's pnvate signature key The page server veπfies, via the registration database, that the publisher 803,806 is authoπzed to deliver the publication to the specified user 805 The page server venfies the signature usmg the publisher's public key, obtained from the publisher's certificate 67 stored m the registration database
The netpage registration server accepts a request to add a pnnting authorization m the form of a subscnption 808 to the database, so long as the request is initiated via a pen registered, via a user, to the pπnter through which the request is initiated - 30 - 3.2.2 Web Terminal Authorization
The user can authorize a Web termmal to pnnt on a pnnter This is useful if the user has a Web termmal m the home which is used to locate documents on the Web for pnnting A prefened embodiment of a Web termmal authorization protocol is shown m Figure 51 According to the protocol, the one-time authorization proceeds as follows the user requests a Web terminal authorization page via the pnnter 601 The netpage registration server generates a short-lifetime one-time-use authorization ID 412 for the Web termmal which is pnnted on the authorization page 413, together with the URI of the pnnter The Web termmal 75 is used to navigate to a netpage registration server registration Web site, where the authorization ID is entered, as well as the URI of the pnnter The Web terminal generates a signature public/pnvate key pan 95,96, and transmits the public key 95 to the registration server The server allocates a termmal ID 68 for the Web termmal, and stores an authorization record 809 m the registration server database linked to the pnnter and containing the termmal ID and public key The URI of the pnnter, the Web terminal's terminal ID, and the pnvate signature key 96 are stored locally m the Web terminal' s database 76
A prefened embodiment of a Web termmal prmtmg protocol is shown in Figure 52 Accordmg to the protocol, whenever the Web termmal 75 wishes to pnnt on the pπnter 601, it sends the pnnter' s designated netpage formatting server 77 a request containing the URI of the document to be pnnted, together with the termmal ID 68 It attches a digital signature 418 to the request, created usmg the Web teπrunal's pnvate signature key 96 On receipt of the request and before acting on it, the formatting server veπfies, via the registration server 11 , that the terminal is authoπzed to pπnt on the specified pπnter The registration server veπfies, via the Web terminal record 809 m the registration server database, that the terminal is authoπzed to pπnt to the pπnter, and veπfies the digital signature usmg the terminal's public key 95
The user can pnnt a list of cuπent pnnting authorizations at any time, and revoke any which are bemg abused
3.3 NETPAGE PEN SECURITY
Each netpage pen is assigned a umque identifier at time of manufacture which is stored in read-only memory m the pen and m the netpage registration server database The pen ID 61 umquely identifies the pen on the netpage network
A netpage pen can "know" a number of netpage pnnters, and a pnnter can "know" a number of pens A pen communicates with a pnnter via a radio frequency signal whenever it is withm range of the pnnter Once a pen and pnnter are registered, they regularly exchange session keys Whenever the pen transmits digital ink to the pnnter, the digital ink is always encrypted usmg the appropnate session key Digital ink is never transmitted m the clear
A pen stores a session key for every pπnter it knows, mdexed by pnnter ID, and a pπnter stores a session key for every pen it knows, mdexed by pen ID Both have a large but finite storage capacity for session keys, and will forget a session key on a least-recently-used basis if necessary
A prefened embodiment of a pen connection protocol is shown m Figure 53 According to the protocol, when a pen 101 comes withm range of a pnnter 601, the pen and pnnter discover whether they aheady know each other
If they don't know each other, then the pπnter determines, via the registration server 11, whether it is supposed to know the pen This might be, for example, because the pen belongs to a user who is registered to use the pnnter The pnnter sends its own pnnted ID 62, together with the pen ID, to the registration server The registration server determines if a pnnter record 802 and a pen record 801 are linked to the same user record 800 m the registration server database 74 If the pnnter is meant to know the pen but doesn't, then it initiates the automatic pen registration procedure descnbed below If the pnnter isn't meant to know the pen, then it agrees with the pen to ignore it until the pen is placed in a - 31 - charging cup, at which time it initiates the registration procedure
In addition to its public pen ID 61, the pen contams a secret key-exchange key 93 The key-exchange key is recorded m the netpage registration server database at time of pen manufacture A prefened embodiment of a pen registration protocol is shown m Figure 54 According to the protocol, the pen 101 transmits its pen ID to the pnnter 601 The pnnter responds with a nonce 423, a random one-time-use number The pen encrypts the nonce usmg its key- exchange key, and returns the encrypted nonce 424 to the pnnter The pπnter transmits the pen ID, nonce and encrypted nonce to the netpage registration server 11 The server venfies, by decrypting the nonce usmg the pen's key-exchange key stored m the registration server database 74, that the pen knows the key-exchange key The server then generates a session key 94 for the pnnter and pen to use, and securely transmits the session key to the pnnter It also transmits a copy 425 of the session key encrypted usmg the pen's key-exchange key The pnnter stores the session key m its flash memory 81 , mdexed by pen ID, and transmits the encrypted session key to the pen The pen stores the session key m its flash memory 83, mdexed by pπnter ID
When a previously unregistered pen is first registered, it is of limited use until it is linked to a user A registered but "un-owned" pen is only allowed to be used to request and fill in netpage user and pen registration forms, to register a new user to which the new pen is automatically linked, or to add a new pen to an existing user
The pen uses secret-key rather than public-key encryption because of hardware performance constraints m the pen 3.4 SECURE DOCUMENTS
The netpage system supports the delivery of secure documents such as tickets and coupons The netpage pnnter mcludes a facility to pnnt watermarks, but will only do so on request from publishers who are suitably authorized The publisher mdicates its authonty to pnnt watermarks m its certificate, which the pπnter is able to authenticate
The "watermark" pnnting process uses an alternative dither matπx m specified "watermark" regions of the page Back-to-back pages contain mirror-image watermark regions which comcide when pnnted The dither matnces used m odd and even pages' watermark regions are designed to produce an interference effect when the regions are viewed together, achieved by looking through the pnnted sheet
The effect is similar to a watermark m that it is not visible when looking at only one side of the page, and is lost when the page is copied by normal means
Pages of secure documents cannot be copied usmg the built-in netpage copy mechanism descnbed m Section 1 9 above This extends to copying netpages on netpage-aware photocopiers
Secure documents are typically generated as part of e-commerce transactions They can therefore mclude the user's photograph which was captured when the user registered biometnc information with the netpage registration server, as descnbed m Section 2
When presented with a secure netpage document, the recipient can venfy its authenticity by requesting its status m the usual way The umque ID of a secure document is only valid for the lifetime of the document, and secure document IDs are allocated non-contiguously to prevent then prediction by opportunistic forgers A secure document venfication pen can be developed with built-in feedback on venfication failure, to support easy point-of-presentation document venfication
Clearly neither the watermark nor the user's photograph are secure m a cryptographic sense They simply provide a significant obstacle to casual forgery Online document venfication, particularly usmg a venfication pen, provides an added level of secunty where it is needed, but is still not entirely immune to forgenes - 32 - 3.5 NON-REPUDIATION
In the netpage system, forms submitted by users are delivered reliably to forms handlers and are persistently archived on netpage page servers It is therefore impossible for recipients to repudiate delivery
E-commerce payments made through the system, as descnbed m Section 4, are also impossible for the payee to repudiate
4 ELECTRONIC COMMERCE MODEL
4.1 SECURE ELECTRONIC TRANSACTION (SET)
The netpage system uses the Secure Electromc Transaction (SET) system as one of its payment systems
SET, havmg been developed by MasterCard and Visa, is organized around payment cards, and this is reflected m the terminology However, much of the system is mdependent of the type of accounts bemg used
In SET, cardholders and merchants register with a certificate authonty and are issued with certificates containing then public signature keys The certificate authonty venfies a cardholder's regisfration details with the card issuer as appropnate, and venfies a merchant's registration details with the acquirer as appropnate Cardholders and merchants store then respective pnvate signature keys securely on then computers Dunng the payment process, these certificates are used to mutually authenticate a merchant and cardholder, and to authenticate them both to the payment gateway
SET has not yet been adopted widely, partly because cardholder maintenance of keys and certificates is considered burdensome Interim solutions which maintain cardholder keys and certificates on a server and give the cardholder access via a password have met with some success 4.2 SET PAYMENTS
In the netpage system the netpage registration server acts as a proxy for the netpage user (l e the cardholder) m SET payment transactions
The netpage system uses biometπcs to authenticate the user and authorize SET payments Because the system is pen-based, the biometnc used is the user's on-lme signature, consisting of time- varying pen position and pressure A fingerprint biometnc can also be used by designing a fingerprint sensor mto the pen, although at a higher cost The type of biometnc used only affects the capture of the biometnc, not the authorization aspects of the system
The first step to bemg able to make SET payments is to register the user's biometnc with the netpage registration server This is done m a controlled environment, for example a bank, where the biometnc can be captured at the same time as the user's identity is venfied The biometnc is captured and stored m the registration database, linked to the user's record The user's photograph is also optionally captured and linked to the record The SET cardholder regisfration process is completed, and the resulting pnvate signature key and certificate are stored m the database The user's payment card information is also stored, giving the netpage regisfration server enough mformation to act as the user's proxy m any SET payment transaction
When the user eventually supplies the biometnc to complete a payment, for example by signing a netpage order form, the pnnter securely transmits the order mformation, the pen ID and the biometnc data to the netpage regisfration server The server venfies the biometnc with respect to the user identified by the pen ID, and from then on acts as the user's proxy m completing the SET payment transaction
4.3 MICRO-PAYMENTS
The netpage system mcludes a mechanism for micro-payments, to allow the user to be conveniently charged for pnnting low-cost documents on demand and for copying copyπght documents, and possibly also to allow the user to be reimbursed for expenses incuπed m pnnting advertismg matenal The latter depends on the level of subsidy aheady - 33 - provided to the user
When the user registers for e-commerce, a network account is established which aggregates micro- payments The user receives a statement on a regular basis, and can settle any outstandmg debit balance usmg the standard payment mechanism The network account can be extended to aggregate subscnption fees for penodicals, which would also otherwise be presented to the user m the form of mdividual statements 4.4 TRANSACTIONS
When a user requests a netpage m a particular application context, the application is able to embed a user- specific transaction ID 55 in the page Subsequent mput through the page is tagged with the transaction ID, and the application is thereby able to establish an appropnate context for the user's mput
When mput occurs through a page which is not user-specific, however, the application must use the user's umque identity to establish a context A typical example mvolves addmg items from a pre-pnnted catalog page to the user's virtual "shoppmg cart" To protect the user's pnvacy, however, the umque user ID 60 known to the netpage system is not divulged to applications This is to prevent different application providers from easily conelating mdependently accumulated behavioral data
The netpage registration server mstead maintains an anonymous relationship between a user and an application via a umque alias ID 65, as shown m Figure 24 Whenever the user activates a hyperlink tagged with the "registered" attπbute, the netpage page server asks the netpage registration server to translate the associated application ID 64, together with the pen ID 61 , mto an alias ID 65 The alias ID is then submitted to the hyperlink's application The application maintains state mformation mdexed by alias ID, and is able to retneve user-specific state information without knowledge of the global identity of the user
The system also maintains an independent certificate and pnvate signature key for each of a user's applications, to allow it to sign application transactions on behalf of the user usmg only application-specific information
To assist the system m routing product bar code (UPC) "hyperlink" activations, the system records a favonte application on behalf of the user for any number of product types
Each application is associated with an application provider, and the system maintains an account on behalf of each application provider, to allow it to credit and debit the provider for click-through fees etc
An application provider can be a publisher of peπodical subscπbed content The system records the user's willingness to receive the subscnbed publication, as well as the expected frequency of publication 4.5 RESOURCE DESCRIPTIONS AND COPYRIGHT
A prefened embodiment of a resource descnption class diagram is shown m Figure 40
Each document and content object may be descnbed by one or more resource descnptions 842 Resource descnptions use the Dublin Core metadata element set, which is designed to facilitate discovery of electromc resources Dublin Core metadata conforms to the World Wide Web Consortium (W3C) Resource Descnption Framework (RDF) A resource descnption may identify πghts holders 920 The netpage system automatically transfers copynght fees from users to nghts holders when users pπnt copynght content 5 COMMUNICATIONS PROTOCOLS
A communications protocol defines an ordered exchange of messages between entities In the netpage system, entities such as pens, pπnters and servers utilise a set of defined protocols to cooperatively handle user mteraction with the netpage system
Each protocol is illustrated by way of a sequence diagram m which the hoπzontal dimension is used to - 34 - represent message flow and the vertical dimension is used to represent time Each entity is represented by a rectangle containing the name of the entity and a vertical column representing the lifeline of the entity Duπng the time an entity exists, the lifeline is shown as a dashed lme Dunng the time an entity is active, the lifeline is shown as a double lme
Because the protocols considered here do not create or destroy entities, lifelmes are generally cut short as soon as an entity ceases to participate m a protocol
5.1 SUBSCRIPTION DELIVERY PROTOCOL
A large number of users may subscπbe to a penodical publication Each user's edition may be laid out differently, but many users' editions will share common content such as text objects and image objects The subscnption delivery protocol therefore delivers document structures to mdividual pnnters via pomtcast, but delivers shared content objects via multicast
A prefened embodiment of a subscnption delivery protocol is shown m Figure 43 Accordmg to the protocol, the application (l e publisher) first obtains a document ID 51 for each document from an ID server 12 It then sends each document structure 836, mcludmg its document ID and page descnptions 5, to the page server 10 responsible for the document's newly allocated ID It mcludes its own application ID 64, the subscnber's alias ID 65, and the relevant set of multicast channel names 402 It attaches a digital signature 401 to the message, created usmg its pnvate signature key
The page server uses the application ID and alias ID to obtain from the regisfration server 11 the conespondmg user ID 60, the user's selected pπnter ID 62 (which may be explicitly selected for the application, or may be the user's default pnnter), and the application's certificate 67 The application's certificate allows the page server to venfy the message signature 401 The page server's request to the registration server fails if the application ID and alias ID don't together identify a subscnption 808
The page server then allocates document and page instance IDs and forwards the page descπptions 5, mcludmg page IDs 50, to the pnnter It mcludes the relevant set of multicast channel names for the pnnter to listen to
It then returns the newly allocated page IDs to the application for future reference Once the application has distnbuted all of the document structures to the subscπbers' selected pπnters via the relevant page servers, it multicasts the vanous subsets of the shared objects 405 on the previously selected multicast channels Both page servers and pπnters momtor the appropnate multicast channels and receive then required content objects They are then able to populate the previously pomtcast document structures 400,404 This allows the page servers to add complete documents to then databases, and it allows the pnnters to pnnt the documents 5.2 HYPERLINK ACTIVATION PROTOCOL
A prefened embodiment of a hyperlink activation protocol is shown m Figure 45 According to the protcol, when a user clicks on a netpage with a netpage pen, the pen communicates the click 406 to the nearest netpage pnnter
601 The click identifies the page and a location on the page The pnnter already knows the pen ID 61 of the pen from the pen connection protocol The pnnter determines, via the DNS, the network address of the page server 10a handling the particular page ID 50 The address may aheady be m its cache if the user has recently mteracted with the same page The pπnter then forwards the pen ID, its own pπnter ID 62, the page ID and click location to the page server
The page server loads the page descnption 5 identified by the page ID and determines which mput element's zone 58, if any, the click lies m Assuπung the relevant mput element is a hyperlink element 844, the page server then obtains the associated application ID 64 and link ID 54, and determines, via the DNS, the network address of the application server hosting the application 71 - 35 - The page server uses the pen ID 61 to obtain the conespondmg user ID 60 from the registration server 11, and then allocates a globally umque hyperlink request ID 52 and builds a hyperlink request 934 The hyperlink request class diagram is shown m Figure 44 The hyperlink request records the IDs of the requesting user and pnnter, and identifies the clicked hyperlink mstance 862 The page server then sends its own server ID 53, the hyperlink request ID, and the link ID to the application
The application produces a response document according to application-specific logic, and obtains a document ID 51 from an ID server 12 It then sends the document 836 to the page server 10b responsible for the document's newly allocated ID, together with the requesting page server's ID and the hyperlink request ID
The second page server sends the hyperlink request ID and application ID to the first page server 10a to obtain the conespondmg user ID and pnnter ID 62 The first page server rejects the request if the hyperlink request has expned or is for a different application
The second page server allocates a document mstance ID and page IDs 50, returns the newly allocated page IDs to the application, adds the complete document to its own database, and finally sends the page descπptions 5 to the requestmg pnnter The hyperlink mstance may include a meaningful transaction ID 55, m which case the first page server mcludes the transaction ID m the message sent to the application This allows the application to establish a transaction- specific context for the hyperlink activation
If the hyperlink requires a user alias, 1 e its "alias reqmred" attnbute is set, then the first page server 10a sends both the pen ID 61 and the hyperlink's application ID 64 to the registration server 11 to obtain not just the user ID conespondmg to the pen ID but also the alias ID 65 conespondmg to the application ID and the user ID It mcludes the alias ID m the message sent to the application, allowing the application to establish a user-specific context for the hyperlink activation
5.3 HANDWRITING RECOGNITION PROTOCOL
A prefened embodiment of a handwnting recognition protocol is shown m Figure 46 According to the protocol, when a user draws a sfroke on a netpage with a netpage pen, the pen communicates the stroke 406 to the nearest netpage pnnter The sfroke identifies the page and a path on the page The pnnter forwards the pen ID 61, its own pπnter ID 62, the page ID 50 and stroke path to the page server 10 in the usual way The page server loads the page descnption 5 identified by the page ID and determines which mput element's zone 58, if any, the sfroke intersects
Assuming the relevant mput element is a text field 878, the page server appends the sfroke to the text field's digital ink After a penod of inactivity m the zone of the text field, the page server sends the pen ID and the pending digital ink 407 to the registration server 11 for mterpretation It may also send the existing text value 408 of the text field to allow the registration server to handle hand-drawn editing commands such as stnke-outs The registration server identifies the user conespondmg to the pen, and uses the user's accumulated handwnting model 822 to interpret the strokes as handwntten text Once it has converted the strokes to text, the registration server returns the converted text 409 to the requesting page server The page server appends the text to the text value of the text field
5.4 SIGNATURE VERIFICATION PROTOCOL
A prefened embodiment of a signature venfication protocol is shown m Figure 47 According to the protocol, a stroke is delivered to a page-specific page server m the same way as descnbed m Section 5 3 Assuming the mput element whose zone the stroke 406 intersects is a signature field 880, the page server 10 appends the stroke to the signature field's digital ink
After a penod of inactivity m the zone of the signature field, the page server sends the pen ID 61 and the - 36 - pendmg digital ink 407 to the registration server 11 for venfication It also sends the application ID 64 associated with the form of which the signature field is part, as well as the form ID 56 and the current data content 405 of the form The registration server identifies the user conespondmg to the pen, and uses the user's dynamic signature biometnc 818 to venfy the strokes as the user's signature Once it has venfied the signature, the registration server uses the application ID 64 and user ID 60 to identify the user's application-specific pnvate signature key It then uses the key to generate a digital signature of the form data, and returns the digital signature 410 to the requesting page server The page server assigns the digital signature to the signature field and sets the associated form's status to frozen
The digital signature mcludes the alias ID 65 of the conespondmg user This allows a smgle form to capture multiple users' signatures 5.5 FORM SUBMISSION PROTOCOL
Form submission occurs via a form hyperlink activation A prefened embodiment of a form submission protocol is shown m Figure 48 It follows the protocol defined m Section 5 2, with some form-specific additions
In the case of a form hyperlink, the hyperlink activation message sent by the page server 10 to the application 71 also contams the form ID 56 and the cuπent data content of the form If the form contams any signature fields, then the application venfies each one by extracting the alias ID 65 associated with the conespondmg digital signature and obtaining the conespondmg certificate from the regisfration server 11
5.6 COMMISSION PAYMENT PROTOCOL
In an e-commerce environment, fees and commissions may be payable from an application provider to a publisher on c ck-throughs, transactions and sales Commissions on fees and commissions on commissions may also be payable from the publisher to the provider of the pnnter
A prefened embodiment of a commission payment protocol is shown m Figure 49 According to the protocol, the hyperlink request ID 52 is used to route a fee or commission credit from the target application provider 70a
(e g merchant) to the source application provider 70b (l e publisher), and from the source application provider 70b to the pnnter provider 72 The target application receives the hyperlink request ID from the page server 10 when the hyperlink is first activated, as descnbed m Section 5 2 When the target application needs to credit the source application provider, it sends the application provider credit 414 to the ongmal page server together with the hyperlink request ID The page server uses the hyperlink request ID to identify the source application, and sends the credit on to the relevant registration server 11 together with the source application ID 64, its own server ID 53, and the hyperlink request ID The registration server credits the conespondmg application provider's account 827 It also notifies the application provider
If the application provider needs to credit the pnnter provider, it sends the pnnter provider credit 415 to the ongmal page server together with the hyperlink request ID The page server uses the hyperlink request ID to identify the pnnter, and sends the credit on to the relevant regisfration server together with the pπnter ID The registration server credits the conespondmg pnnter provider account 814 The source application provider is optionally notified of the identity of the target application provider, and the pπnter provider of the identity of the source application provider
6. NETPAGE PEN DESCRIPTION
6.1 PEN MECHANICS
Refernng to Figures 8 and 9, the pen, generally designated by reference numeral 101, mcludes a housmg 102 m the form of a plastics moulding having walls 103 defining an mteπor space 104 for mounting the pen components The pen top 105 is m operation rotatably mounted at one end 106 of the housing 102 A semi-transparent - 37 - cover 107 is secured to the opposite end 108 of the housmg 102 The cover 107 is also of moulded plastics, and is formed from semi-transparent matenal m order to enable the user to view the status of the LED mounted withm the housmg 102 The cover 107 mcludes a mam part 109 which substantially sunounds the end 108 of the housmg 102 and a projecting portion 110 which projects back from the mam part 109 and fits withm a conespondmg slot 111 formed m the walls 103 of the housmg 102 A radio antenna 112 is mounted behind the projecting portion 110, withm the housing
102 Screw threads 113 suπounding an aperture 113A on the cover 107 are aπanged to receive a metal end piece 114, mcludmg conespondmg screw threads 115 The metal end piece 114 is removable to enable mk cartndge replacement
Also mounted withm the cover 107 is a tn-color status LED 116 on a flex PCB 117 The antenna 112 is also mounted on the flex PCB 117 The status LED 116 is mounted at the top of the pen 101 for good all-around visibility The pen can operate both as a normal marking mk pen and as a non-marking stylus An mk pen cartndge
118 with nib 119 and a stylus 120 with stylus mb 121 are mounted side by side withm the housmg 102 Either the mk cartndge mb 119 or the stylus mb 121 can be brought forward through open end 122 of the metal end piece 114, by rotation of the pen top 105 Respective slider blocks 123 and 124 are mounted to the mk cartndge 118 and stylus 120, respectively A rotatable cam baπel 125 is secured to the pen top 105 m operation and aπanged to rotate therewith The cam baπel 125 mcludes a cam 126 m the form of a slot withm the walls 181 of the cam baπel Cam followers 127 and 128 projecting from slider blocks 123 and 124 fit within the cam slot 126 On rotation of the cam baπel 125, the slider blocks 123 or 124 move relative to each other to project either the pen mb 119 or stylus mb 121 out through the hole 122 m the metal end piece 114 The pen 101 has three states of operation By turning the top 105 through 90° steps, the three states are • Stylus 120 mb 121 out,
• Ink cartndge 118 b 119 out, and
• Neither ink cartndge 118 mb 119 out nor stylus 120 mb 121 out
A second flex PCB 129, is mounted on an electronics chassis 130 which sits withm the housmg 102 The second flex PCB 129 mounts an infrared LED 131 for providing infrared radiation for projection onto the surface An image sensor 132 is provided mounted on the second flex PCB 129 for receivmg reflected radiation from the surface The second flex PCB 129 also mounts a radio frequency chip 133, which mcludes an RF transmitter and RF receiver, and a controller chip 134 for controlling operation of the pen 101 An optics block 135 (formed from moulded clear plastics) sits withm the cover 107 and projects an infrared beam onto the surface and receives images onto the image sensor 132 Power supply wnes 136 connect the components on the second flex PCB 129 to battery contacts 137 which are mounted withm the cam baπel 125 A terminal 138 connects to the battery contacts 137 and the cam band 125 A three volt rechargeable battery 139 sits withm the cam barrel 125 m contact with the battery contacts An induction charging coil 140 is mounted about the second flex PCB 129 to enable recharging of the battery 139 via induction The second flex PCB 129 also mounts an infrared LED 143 and infrared photodiode 144 for detecting displacement m the cam baπel 125 when either the stylus 120 or the ink cartridge 118 is used for wnting, m order to enable a determination of the force bemg applied to the surface by the pen mb 119 or stylus mb 121 The IR photodiode 144 detects light from the IR LED 143 via reflectors (not shown) mounted on the slider blocks 123 and 124
Rubber gnp pads 141 and 142 are provided towards the end 108 of the housmg 102 to assist gnpping the pen 101, and top 105 also mcludes a clip 142 for clipping the pen 101 to apocket 6.2 PEN CONTROLLER The pen 101 is aπanged to determrne the position of its mb (stylus mb 121 or ink cartridge mb 119) by imaging, m the infrared spectrum, an area of the surface m the vicinity of the mb It records the location data from the - 38 - nearest location tag, and is arranged to calculate the distance of the mb 121 or 119 from the location tab utilismg optics
135 and controller chip 134 The controller chip 134 calculates the onentation of the pen and the nib-to-tag distance from the perspective distortion observed on the imaged tag
Utilismg the RF chip 133 and antenna 112 the pen 101 can transmit the digital ink data (which is encrypted for secunty and packaged for efficient transmission) to the computing system
When the pen is m range of a receiver, the digital ink data is transmitted as it is formed When the pen 101 moves out of range, digital ink data is buffered withm the pen 101 (the pen 101 cncuifry mcludes a buffer ananged to store digital ink data for approximately 12 minutes of the pen motion on the surface) and can be transmitted later
The controller chip 134 is mounted on the second flex PCB 129 m the pen 101 Figure 10 is a block diagram illustrating m more detail the architecture of the confroller chip 134 Figure 10 also shows representations of the RF chip 133, the image sensor 132, the tn-color status LED 116, the IR illumination LED 131, the IR force sensor LED 143, and the force sensor photodiode 144
The pen controller chip 134 mcludes a controlling processor 145 Bus 146 enables the exchange of data between components of the controller chip 134 Flash memory 147 and a 512 KB DRAM 148 are also mcluded An analog-to-digital converter 149 is ananged to convert the analog signal from the force sensor photodiode 144 to a digital signal
An image sensor mterface 152 interfaces with the image sensor 132 A transceiver controller 153 and base band cncuit 154 are also mcluded to mterface with the RF chip 133 which mcludes an RF cncuit 155 and RF resonators and mductors 156 connected to the antenna 112 The controlling processor 145 captures and decodes location data from tags from the surface via the image sensor 132, monitors the force sensor photodiode 144, controls the LEDs 116, 131 and 143, and handles short-range radio communication via the radio transceiver 153 It is a medium-performance (~40MHz) general-purpose RISC processor
The processor 145, digital transceiver components (transceiver confroller 153 and baseband cncuit 154), image sensor mterface 152, flash memory 147 and 512KB DRAM 148 are integrated m a single controller ASIC Analog RF components (RF cncuit 155 and RF resonators and mductors 156) are provided in the separate RF chip
The image sensor is a 215x215 pixel CCD (such a sensor is produced by Matsushita Electromc Corporation, and is descπbed m a paper by Itakura, K T Nobusada, N Okusenya, R Nagayoshi, and M Ozaki, "A 1mm 50k-Pιxel IT CCD Image Sensor for Miniature Camera System", IEEE Transactions on Electromc Devices, Volt 47, number 1, January 2000, which is incorporated herein by reference) with an IR filter
The controller ASIC 134 enters a quiescent state after a peπod of inactivity when the pen 101 is not in contact with a surface It mcorporates a dedicated cncuit 150 which monitors the force sensor photodiode 144 and wakes up the controller 134 via the power manager 151 on a pen-down event
The radio transceiver communicates m the unlicensed 900MHz band normally used by cordless telephones, or alternatively m the unlicensed 2 4GHz mdustnal, scientific and medical (ISM) band, and uses frequency hoppmg and collision detection to provide interference-free communication
In an alternative embodiment, the pen mcorporates an Infrared Data Association (IrDA) mterface for short- range communication with a base station or netpage pnnter
In a further embodiment, the pen 101 mcludes a parr of orthogonal accelerometers mounted m the normal plane of the pen 101 axis The accelerometers 190 are shown m Figures 9 and 10 m ghost outline
The provision of the accelerometers enables this embodiment of the pen 101 to sense motion without - 39 - reference to surface location tags, allowmg the location tags to be sampled at a lower rate Each location tag ID can then identify an object of mterest rather than a position on the surface For example, if the object is a user mterface mput element (e g a command button), then the tag ID of each location tag within the area of the mput element can dnectly identify the mput element The acceleration measured by the accelerometers m each of the x and y dnections is integrated with respect to tune to produce an instantaneous velocity and position
Since the starting position of the stroke is not known, only relative positions withm a sfroke are calculated
Although position mtegration accumulates enors m the sensed acceleration, accelerometers typically have high resolution, and the time duration of a stroke, over which enors accumulate, is short 7. NETPAGE PRINTER DESCRIPTION
7.1 PRINTER MECHANICS
The vertically-mounted netpage wallpnnter 601 is shown fully assembled m Figure 11 It pnnts netpages on
Letter/A4 sized media using duplexed 8.4" Memjet™ pnnt engmes 602 and 603, as shown m Figures 12 and 12a It uses a straight paper path with the paper 604 passmg through the duplexed pnnt engmes 602 and 603 which pπnt both sides of a sheet simultaneously, in full color and with full bleed
An integral binding assembly 605 applies a stnp of glue along one edge of each pnnted sheet, allowmg it to adhere to the previous sheet when pressed against it This creates a final bound document 618 which can range m thickness from one sheet to several hundred sheets
The replaceable ink cartndge 627, shown m Figure 13 coupled with the duplexed pnnt engmes, has bladders or chambers for storing fixative, adhesive, and cyan, magenta, yellow, black and infrared inks The cartndge also contams a micro a filter m a base molding The micro an filter interfaces with an an pump 638 mside the pnnter via a hose 639 This provides filtered an to the printheads to prevent ingress of micro particles mto the Memjet™ printheads 350 which might otherwise clog the pnnthead nozzles By incorporating the an filter withm the cartndge, the operational life of the filter is effectively linked to the life of the cartndge The ink cartndge is a fully recyclable product with a capacity for pπnting and gluing 3000 pages (1500 sheets)
Refernng to Figure 12, the motorized media pick-up roller assembly 626 pushes the top sheet directly from the media tray past a paper sensor on the first pnnt engme 602 mto the duplexed Memjet™ pnnthead assembly The two Memjet™ pnnt engmes 602 and 603 are mounted m an opposmg m-lme sequential configuration along the straight paper path The paper 604 is drawn mto the first pπnt engme 602 by integral, powered pick-up rollers 626 The position and size of the paper 604 is sensed and full bleed pnnting commences Fixative is pnnted simultaneously to aid drying m the shortest possible time
The paper exits the first Memjet™ pnnt engme 602 through a set of powered exit spike wheels (aligned along the straight paper path), which act against a rubberized roller These spike wheels contact the 'wet' pnnted surface and continue to feed the sheet 604 mto the second Memjet™ pnnt engme 603 Refernng to Figures 12 and 12a, the paper 604 passes from the duplexed pnnt engmes 602 and 603 mto the bmder assembly 605 The pnnted page passes between a powered spike wheel axle 670 with a fibrous support roller and another movable axle with spike wheels and a momentary action glue wheel The movable axle/glue assembly 673 is mounted to a metal support bracket and it is transported forward to mterface with the powered axle 670 via gears by action of a camshaft A separate motor powers this camshaft The glue wheel assembly 673 consists of a partially hollow axle 679 with a rotating couplmg for the glue supply hose 641 from the ink cartndge 627 This axle 679 connects to a glue wheel, which absorbs adhesive by capillary - 40 - action through radial holes A molded housmg 682 sunounds the glue wheel, with an opemng at the front Pivoting side moldmgs and sprung outer doors are attached to the metal bracket and lunge out sideways when the rest of the assembly 673 is thrust forward This action exposes the glue wheel through the front of the molded housmg 682 Tension springs close the assembly and effectively cap the glue wheel dunng penods of inactivity As the sheet 604 passes mto the glue wheel assembly 673, adhesive is applied to one vertical edge on the front side (apart from the first sheet of a document) as it is transported down mto the bmdmg assembly 605 7.2 PRINTER CONTROLLER ARCHITECTURE
The netpage pπnter controller consists of a controlling processor 750, a factory-installed or field-installed network mterface module 625, a radio transceiver (transceiver confroller 753, baseband cncmt 754, RF cncmt 755, and RF resonators and mductors 756), dual raster image processor (RIP) DSPs 757, duplexed pπnt engme controllers 760a and 760b, flash memory 658, and 64MB of DRAM 657, as illustrated m Figure 14
The controlling processor handles communication with the network 19 and with local wneless netpage pens 101, senses the help button 617, controls the user mterface LEDs 613-616, and feeds and synchronizes the RIP DSPs 757 and pπnt engme controllers 760 It consists of a medium-performance general-purpose microprocessor The controlling processor 750 communicates with the pπnt engme controllers 760 via a high-speed senal bus 659
The RIP DSPs rastenze and compress page descnptions to the netpage pnnter' s compressed page format Each pπnt engme controller expands, dithers and pnnts page images to its associated Memjet™ pnnthead 350 m real time (I e at over 30 pages per minute) The duplexed pπnt engme controllers pπnt both sides of a sheet simultaneously The master pnnt engme controller 760a controls the paper transport and momtors ink usage in conjunction with the master QA chip 665 and the mk cartndge QA chip 761
The pnnter controller's flash memory 658 holds the software for both the processor 750 and the DSPs 757, as well as configuration data This is copied to mam memory 657 at boot time
The processor 750, DSPs 757, and digital transceiver components (transceiver controller 753 and baseband cncuit 754) are integrated m a smgle controller ASIC 656 Analog RF components (RF cncuit 755 and RF resonators and mductors 756) are provided m a separate RF chip 762 The network mterface module 625 is separate, smce netpage pπnters allow the network connection to be factory-selected or field-selected Flash memory 658 and the 2x256Mbit
(64MB) DRAM 657 is also off-chip The pπnt engme controllers 760 are provided m separate ASICs
A vanety of network mterface modules 625 are provided, each providing a netpage network mterface 751 and optionally a local computer or network mterface 752 Netpage network Internet interfaces include POTS modems, Hybnd Fiber-Coax (HFC) cable modems, ISDN modems, DSL modems, satellite transceivers, cuπent and next- generation cellular telephone transceivers, and wneless local loop (WLL) transceivers Local interfaces mclude IEEE 1284 (parallel port), lOBase-T and 100Base-T Ethernet, USB and USB 2 0, IEEE 1394 (Fnewne), and vanous emerging home networking interfaces If an Internet connection is available on the local network, then the local network mterface can be used as the netpage network mterface The radio transceiver 753 communicates m the unlicensed 900MHz band normally used by cordless telephones, or alternatively in the unlicensed 2 4GHz indusfrial, scientific and medical (ISM) band, and uses frequency hoppmg and collision detection to provide interference-free communication
The pnnter controller optionally mcorporates an Infrared Data Association (IrDA) mterface for receiving data "squirted" from devices such as netpage cameras In an alternative embodiment, the pπnter uses the IrDA mterface for short-range communication with suitably configured netpage pens - 41 -
7.2.1 RASTERIZATION AND PRINTING
Once the ma processor 750 has received and venfied the document's page layouts and page objects, it runs the appropnate RIP software on the DSPs 757
The DSPs 757 rastenze each page descnption and compress the rastenzed page image The mam processor stores each compressed page image m memory The simplest way to load-balance multiple DSPs is to let each DSP rastenze a separate page The DSPs can always be kept busy since an arbitrary number of rastenzed pages can, m general, be stored m memory This strategy only leads to potentially poor DSP utilization when rasteπzmg short documents
Watermark regions m the page descπption are rastenzed to a contone-resolution bi-level bitmap which is losslessly compressed to negligible size and which forms part of the compressed page image
The infrared (IR) layer of the pnnted page contams coded netpage tags at a density of about six per mch Each tag encodes the page ID, tag ID, and control bits, and the data content of each tag is generated dunng rasterization and stored m the compressed page image
The mam processor 750 passes back-to-back page images to the duplexed pnnt engine controllers 760 Each pnnt engme controller 760 stores the compressed page image m its local memory, and starts the page expansion and pπnting pipelme Page expansion and pnnting is pipelined because it is impractical to store an entire 114MB bi-level CMYK+IR page image m memory
7.2.2 PRINT ENGINE CONTROLLER
The page expansion and printing pipelme of the pnnt engme controller 760 consists of a high speed IEEE 1394 senal mterface 659, a standard JPEG decoder 763, a standard Group 4 Fax decoder 764, a custom halftoner/compositor unit 765, a custom tag encoder 766, a lme loader/formatter unit 767, and a custom mterface 768 to the Memjet™ pnnthead 350
The pnnt engme confroller 360 operates m a double buffered manner While one page is loaded mto DRAM 769 via the high speed senal mterface 659, the previously loaded page is read from DRAM 769 and passed through the pnnt engme controller pipelme Once the page has fimshed pπnting, the page just loaded is pnnted while another page is loaded
The first stage of the pipelme expands (at 763) the JPEG-compressed contone CMYK layer, expands (at 764) the Group 4 Fax-compressed bi-level black layer, and renders (at 766) the bi-level netpage tag layer according to the tag format defined m section 1 2, all m parallel The second stage dithers (at 765) the contone CMYK layer and composites (at 765) the bi-level black layer over the resulting bi-level CMYK layer The resultant bi-level CMYK+IR dot data is buffered and formatted (at 767) for pnnting on the Memjet™ pnnthead 350 via a set of lme buffers Most of these lme buffers are stored m the off-chip DRAM The final stage pnnts the six channels of bi-level dot data (mcludmg fixative) to the Memjet™ pnnthead 350 via the pnnthead mterface 768
When several pnnt engme controllers 760 are used m unison, such as in a duplexed configuration, they are synchronized via a shared lme sync signal 770 Only one pnnt engme 760, selected via the external master/slave pm 771, generates the lme sync signal 770 onto the shared lme
The pπnt engme controller 760 contams a low-speed processor 772 for synchronizing the page expansion and rendering pipelme, configuring the pnnthead 350 via a low-speed senal bus 773, and controlling the stepper motors
675, 676 In the 8!4" versions of the netpage pnnter, the two pπnt engmes each pnnts 30 Letter pages per minute along the long dimension of the page (11"), giving a lme rate of 8 8 kHz at 1600 dpi In the 12" versions of the netpage - 42 - pnnter, the two pnnt engmes each pnnts 45 Letter pages per mmute along the short dimension of the page (8.4"), giving a lme rate of 102 kHz These lme rates are well withm the operating frequency of the Memjet™ pnnthead, which m the cuπent design exceeds 30 kHz
CONCLUSION The present mvention has been descnbed with reference to a prefened embodiment and number of specific alternative embodiments However, it will be appreciated by those skilled m the relevant fields that a number of other embodiments, differing from those specifically descnbed, will also fall within the spiπt and scope of the present mvention Accordmglv, it will be understood that the mvention is not mtended to be limited to the specific embodiments descπbed in the present specification, mcludmg documents mcorporated by cross-reference as appropnate The scope of the mvention is only limited by the attached claims

Claims

- 43 - CLAIMS
1 In a network connected to a pπnter and a publisher of network publications, a network publishing authorization protocol for authorizing the pπnting of a publication at the pnnter, mcludmg the steps of addressing the publication to a user, signing the publication usmg a pnvate key, sendmg the publication to the pπnter, and corifirmmg that the publication may be prmted at the pnnter, by venfymg the pnvate key signature
2 A network publishmg authorization protocol according to claim 1 , mcludmg the further step of registering the user with a pπnter by creating a record m a database of a first server connected to the network
3 A network publishing authorization protocol according to claim 2, mcludmg the further step of registering the publisher with the first server
4 A network publishing authorization protocol according to claim 3, where the first server holds a public signature key of the publisher 5 A network publishing authorization protocol according to claim 4, mcludmg the further step of subscnbmg the user to a publication of the publisher by creating a record m a database of the first server
6 A network publishing authorization protocol according to claim 5, where the first server holds details of an alias identity of the user
7 A network publishing authorization protocol according to claim 6, where the first server holds a subscnption record for the purpose of subscnbmg the user to the publication, containmg details of the publisher's identity and the user's alias identity
8 A network publishmg authorization protocol accordmg to claim 5, mcludmg the further step of carrying out the confirmation at the pnnter
9 A network publishing authorization protocol accordmg to claim 8, mcludmg the further steps of accomplishing the confirmation by confirming that the publisher is authoπzed to pπnt the publication to the pnnter, by accessmg the first server to confirm the subscnption
10 A network publishmg authorization protocol according to claim 9, mcludmg the further step of venfymg the publisher's signature at the prmter usmg the publisher's public key, obtained from the first server 11 A network publishing authorization protocol according to claim 9, mcludmg the further step of venfymg at the pπnter that the pnnter is registered for the user, by accessmg the first server
12 A network publishing authorization protocol according to claim 5, mcludmg the further step of carrying out the co-vfirmation at the first server
13 A network publishmg authorization protocol accordmg to claim 12, mcludmg the further steps of accomplishing the confirmation by checking that the publisher is authoπzed to pnnt the publication to the pnnter, by confirπung the subscnption
14 A network publishmg authorization protocol according to claim 13, mcludmg the further step of venfymg the publisher's signature usmg the publisher's public signature key
15 A network publishing authorization protocol according to claim 13, mcludmg the further step of venfymg that the pπnter is registered for the user
16 A network publishmg authorization protocol according to claim 15, mcludmg the further steps of - 44 - fhe publisher first obtaining a document identity for each document to be pπnted from an identity server, then sendmg each document structure, mcludmg its identity and page descnptions to a page server responsible for that document identity
17 A network publishmg authorization protocol accordmg to claim 16, mcludmg the further steps of mcludmg its own identity, the user's alias identity and a set of multicast channel names, and signing the message usmg its pnvate signature
18 A network publishmg authorization protocol accordmg to claim 17, mcludmg the further steps of the page server usmg the publisher's identity and the user's alias identity to obtain a conespondmg user's identity and the user's pπnter' s identity from a registration server 19 A network publishing authorization protocol according to claim 18, mcludmg the further steps of the confirmation bemg earned out by the registration server, and failing if the publisher's identity and the alias identity don't together identify a subscnption to the publication
20 A network publishing authorization protocol accordmg to claim 19, mcludmg the further steps of the page server allocating document and page mstance identities and forwarding the page descnptions, mcludmg page identities, to the pπnter, also sending names of multicast channels for the pπnter to listen to, and returning the newly allocated page identities to the publisher for future use
21 A network publishing authorization protocol according to claim 5, mcludmg the further steps of sending at least some of the publication to the second server, carrying out the confirmation at a second server, and, m the event that the confirmation succeeds, sendmg the at least some of the publication from the second server to the pπnter
22 A network publishing authorization protocol accordmg to claim 1 , mcludmg the further steps of accomplishing the confirmation by conftrmmg that the publisher is authorized to pnnt the publication to the pnnter, by accessmg the first server to confirm the subscnption 23 A network publishmg authorization protocol according to claim 22, mcludmg the further step of venfymg the publisher's signature at the second server usmg the publisher's public key, obtained from the first server 24 A network publishing authorization protocol according to claim 23, mcludmg the further step of venfymg at the second server that the pnnter is registered for the user, by accessmg the first server
PCT/AU2000/000541 1999-05-25 2000-05-24 Network publishing authorization protocol WO2000072505A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
BR0010854-5A BR0010854A (en) 1999-05-25 2000-05-24 Networking Authorization Protocol
IL14663600A IL146636A0 (en) 1999-05-25 2000-05-24 Network publishing authorization protocol
JP2000619854A JP2003500714A (en) 1999-05-25 2000-05-24 Network publishing permission protocol
EP00929057A EP1222773B1 (en) 1999-05-25 2000-05-24 Network publishing authorization protocol
DE60029462T DE60029462D1 (en) 1999-05-25 2000-05-24 PROTOCOL ON NETWORK PUBLISHING AUTHORIZATION
CA2371584A CA2371584C (en) 1999-05-25 2000-05-24 Network publishing authorization protocol
MXPA01012115A MXPA01012115A (en) 1999-05-25 2000-05-24 Network publishing authorization protocol.
AU47280/00A AU4728000A (en) 1999-05-25 2000-05-24 Network publishing authorization protocol
IL146636A IL146636A (en) 1999-05-25 2001-11-21 Network publishing authorization protocol
HK03100076.4A HK1048030A1 (en) 1999-05-25 2003-01-03 Network publishing authorization protocol

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPQ0559 1999-05-25
AUPQ0559A AUPQ055999A0 (en) 1999-05-25 1999-05-25 A method and apparatus (npage01)
AUPQ1313 1999-06-30
AUPQ1313A AUPQ131399A0 (en) 1999-06-30 1999-06-30 A method and apparatus (NPAGE02)

Publications (1)

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WO2000072505A1 true WO2000072505A1 (en) 2000-11-30

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Family Applications (24)

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PCT/AU2000/000520 WO2000072202A1 (en) 1999-05-25 2000-05-24 Method and system for providing information in a document
PCT/AU2000/000522 WO2000072233A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of a newspaper or magazine
PCT/AU2000/000577 WO2000072135A1 (en) 1999-05-25 2000-05-24 Computer system control with user data via interface surface
PCT/AU2000/000541 WO2000072505A1 (en) 1999-05-25 2000-05-24 Network publishing authorization protocol
PCT/AU2000/000566 WO2000072238A1 (en) 1999-05-25 2000-05-24 System for data transfer
PCT/AU2000/000536 WO2000072248A1 (en) 1999-05-25 2000-05-24 Method and system for providing a copy of a printed page
PCT/AU2000/000532 WO2000072237A1 (en) 1999-05-25 2000-05-24 Method and system for creation and use of a photo album
PCT/AU2000/000524 WO2000072235A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of a book
PCT/AU2000/000565 WO2000072230A1 (en) 1999-05-25 2000-05-24 Movement sensing device
PCT/AU2000/000567 WO2000072287A1 (en) 1999-05-25 2000-05-24 Orientation sensing device
PCT/AU2000/000540 WO2000072499A1 (en) 1999-05-25 2000-05-24 Network printer registration protocol
PCT/AU2000/000558 WO2000071350A1 (en) 1999-05-25 2000-05-24 Printer cartridge including machine readable ink
PCT/AU2000/000525 WO2000072138A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of a secure document
PCT/AU2000/000529 WO2000072236A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of a greeting card
PCT/AU2000/000531 WO2000072576A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of a facsimile
PCT/AU2000/000559 WO2000072137A1 (en) 1999-05-25 2000-05-24 Method and system for distributing documents
PCT/AU2000/000542 WO2000072136A1 (en) 1999-05-25 2000-05-24 Network terminal authorization protocol
PCT/AU2000/000533 WO2000072125A1 (en) 1999-05-25 2000-05-24 Method and system for note taking
PCT/AU2000/000521 WO2000072232A1 (en) 1999-05-25 2000-05-24 Method and system for providing targeted information in a document
PCT/AU2000/000523 WO2000072234A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of a brochure
PCT/AU2000/000573 WO2000072132A1 (en) 1999-05-25 2000-05-24 Document request via interface surface
PCT/AU2000/000563 WO2000072128A1 (en) 1999-05-25 2000-05-24 Interactive printer with actuator
PCT/AU2000/000557 WO2000071348A1 (en) 1999-05-25 2000-05-24 Printer consumable cartridge with air filter
PCT/AU2000/000528 WO2000072243A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of electronic mail

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PCT/AU2000/000520 WO2000072202A1 (en) 1999-05-25 2000-05-24 Method and system for providing information in a document
PCT/AU2000/000522 WO2000072233A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of a newspaper or magazine
PCT/AU2000/000577 WO2000072135A1 (en) 1999-05-25 2000-05-24 Computer system control with user data via interface surface

Family Applications After (20)

Application Number Title Priority Date Filing Date
PCT/AU2000/000566 WO2000072238A1 (en) 1999-05-25 2000-05-24 System for data transfer
PCT/AU2000/000536 WO2000072248A1 (en) 1999-05-25 2000-05-24 Method and system for providing a copy of a printed page
PCT/AU2000/000532 WO2000072237A1 (en) 1999-05-25 2000-05-24 Method and system for creation and use of a photo album
PCT/AU2000/000524 WO2000072235A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of a book
PCT/AU2000/000565 WO2000072230A1 (en) 1999-05-25 2000-05-24 Movement sensing device
PCT/AU2000/000567 WO2000072287A1 (en) 1999-05-25 2000-05-24 Orientation sensing device
PCT/AU2000/000540 WO2000072499A1 (en) 1999-05-25 2000-05-24 Network printer registration protocol
PCT/AU2000/000558 WO2000071350A1 (en) 1999-05-25 2000-05-24 Printer cartridge including machine readable ink
PCT/AU2000/000525 WO2000072138A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of a secure document
PCT/AU2000/000529 WO2000072236A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of a greeting card
PCT/AU2000/000531 WO2000072576A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of a facsimile
PCT/AU2000/000559 WO2000072137A1 (en) 1999-05-25 2000-05-24 Method and system for distributing documents
PCT/AU2000/000542 WO2000072136A1 (en) 1999-05-25 2000-05-24 Network terminal authorization protocol
PCT/AU2000/000533 WO2000072125A1 (en) 1999-05-25 2000-05-24 Method and system for note taking
PCT/AU2000/000521 WO2000072232A1 (en) 1999-05-25 2000-05-24 Method and system for providing targeted information in a document
PCT/AU2000/000523 WO2000072234A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of a brochure
PCT/AU2000/000573 WO2000072132A1 (en) 1999-05-25 2000-05-24 Document request via interface surface
PCT/AU2000/000563 WO2000072128A1 (en) 1999-05-25 2000-05-24 Interactive printer with actuator
PCT/AU2000/000557 WO2000071348A1 (en) 1999-05-25 2000-05-24 Printer consumable cartridge with air filter
PCT/AU2000/000528 WO2000072243A1 (en) 1999-05-25 2000-05-24 Method and system for delivery of electronic mail

Country Status (17)

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US (132) US7123239B1 (en)
EP (24) EP1222610A4 (en)
JP (25) JP4454160B2 (en)
KR (25) KR100733487B1 (en)
CN (34) CN1319313C (en)
AT (13) ATE284100T1 (en)
AU (26) AU772595B2 (en)
BR (24) BR0010791A (en)
CA (24) CA2374833C (en)
DE (14) DE60030993D1 (en)
DK (2) DK1222522T3 (en)
ES (1) ES2269140T3 (en)
HK (18) HK1047646A1 (en)
IL (43) IL146650A0 (en)
MX (24) MXPA01012133A (en)
SG (8) SG122798A1 (en)
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US20080164647A1 (en) 2008-07-10
AU4726700A (en) 2000-12-12
HK1048001A1 (en) 2003-03-14
EP1222611A4 (en) 2004-06-16
EP1228459A1 (en) 2002-08-07
JP2003500252A (en) 2003-01-07
KR100855785B1 (en) 2008-09-01
US20030098997A1 (en) 2003-05-29
US20100253978A1 (en) 2010-10-07
IL146670A0 (en) 2002-07-25
CN1360690A (en) 2002-07-24
EP1228459A4 (en) 2004-06-30
KR100759351B1 (en) 2007-09-17
US20030091234A1 (en) 2003-05-15
US8107114B2 (en) 2012-01-31
US7347357B2 (en) 2008-03-25
IL146610A0 (en) 2002-07-25
CA2371575C (en) 2011-10-25
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BR0010841A (en) 2002-05-28
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BR0010854A (en) 2002-06-04
US7336389B2 (en) 2008-02-26
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US20100129006A1 (en) 2010-05-27
US7190346B2 (en) 2007-03-13
CN100407210C (en) 2008-07-30
US8295653B2 (en) 2012-10-23
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US6718061B2 (en) 2004-04-06
US6789194B1 (en) 2004-09-07
US6840606B2 (en) 2005-01-11
CA2371948C (en) 2010-09-28
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US7959064B2 (en) 2011-06-14
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US7259884B2 (en) 2007-08-21
US7900821B2 (en) 2011-03-08
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US7674082B2 (en) 2010-03-09
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US7819616B2 (en) 2010-10-26
HK1047999A1 (en) 2003-03-14
US20100165400A1 (en) 2010-07-01
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