(i9) United States
(12) Patent Application Publication
MacLean et al.
(io) Pub. No.: US 2007/0160208 Al (43) Pub. Date: Jul. 12, 2007
(54) SELECTIVE AND PERSISTENT
APPLICATION LEVEL ENCRYTION FOR
VIDEO PROVIDED TO A CLIENT
(75) Inventors: Charles Duncan MacLean, Claremont, CA (US); Thomas Inskip, Lauderhill, FL (US)
DARBY & DARBY P.C.
P. O. BOX 5257
NEW YORK, NY 10150-5257 (US)
(73) Assignee: Widevine Technologies, Inc., Seattle, WA
(21) Appl. No.: 11/619,337
(22) Filed: Jan. 3, 2007
Related U.S. Application Data
(60) Provisional application No. 60/757,055, filed on Jan. 6, 2006.
A system, apparatus, and method are directed towards allowing ingestion of encrypted content into such as a VOD server, or PVR, or the like by selectively encrypting portions of a content stream based on various selection rules. In one embodiment, the selection rules include leaving selected portions of the content stream unencrypted, including packets that include a PES header; or video packets that include various trick play data such as picture start, GOP start, sequence start, sequence end data; PIDs associated with a PAT, PMT, or the like; while other portions of the content stream may be encrypted, including video and/or audio PIDs, or other video and/or audio portions. In still another embodiment, Entitlement Control Messages (ECMs) may be inserted that employ an encryption/decryption key rotation scheme, such as odd and/or even scrambling control bit structures, which may also be rotated based on a variety of conditions.