A computer system enabling mutual exchange of information between users and digital content, in a manner corresponding to each individual disk, comprises a plurality of computers each capable of being loaded with a disk having a unique disk ID, and a verification server capable of being connected with...http://www.google.fr/patents/US7610392?utm_source=gb-gplus-shareBrevet US7610392 - Computer system and method for transmitting user status information
Computer system and method for transmitting user status information
