A recording/playback apparatus is capable of using pre-image-converted content in a case of transferring an image-converted content to another device, then back from transfer-destination device to the recording/playback apparatus. The recording/playback apparatus includes a storage unit that stores a...http://www.google.fr/patents/US7889863?utm_source=gb-gplus-shareBrevet US7889863 - Recording device, recording medium, and content protection system
Recording device, recording medium, and content protection system
