A digital versatile disc (DVD) includes a read-only ROM area in which video is previously recorded, and a readable/writable RAM area. A lender DVD apparatus writes a playback/recording control program in the RAM area of the DVD to be rented. A user DVD apparatus reads the playback/recording control program...http://www.google.fr/patents/US6654547?utm_source=gb-gplus-shareBrevet US6654547 - DVD rental system and method
