In order to share content possessed by each user among a plurality of users who hold a token of encrypted content, a content playback system includes a playback requesting apparatus which holds a token and which requests the playback of the encrypted content, and a temporary playback apparatus for performing...http://www.google.fr/patents/US20010034714?utm_source=gb-gplus-shareBrevet US20010034714 - Content playback system, content playback method, content playback requesting apparatus, and temporary playback apparatus
Numéro de demande: 09/790,046 Numéro de publication: US 2001/0034714 A1 Date de dépôt: 21 févr. 2001 Brevet délivré: US7251330 ( Date de délivrance 31 juil. 2007)
