The invention is concerned with enabling substantially anonymous purchases of media products or other products (or access to an on-line service) to be made on-line. In order to initiate a purchasing session, consisting of one or more purchasing transactions, the purchaser authenticates himself to a home...http://www.google.de/patents/US7653809?utm_source=gb-gplus-sharePatent US7653809 - Method and system for controlling the on-line supply of digital products or the access to on-line services
