An electronic commerce system provides for delivery of benefits in cross company marketing efforts to a user through the use of a value token, yet supports the privacy of the user. The system includes a club manager to register the user as a club member, to create the value token associating the club...http://www.google.de/patents/US20020161591?utm_source=gb-gplus-sharePatent US20020161591 - METHOD OF SECURELY PASSING A VALUE TOKEN BETWEEN WEB SITES
