Abstract:
A content transmission/reception method, a content transmission/reception apparatus, and a content transmission/reception program capable of enhancing efficiency of descrambling a scrambled content, facilitating management of an encryption key used for descrambling, and protecting content copyright. The apparatus includes a content transmission device (3) for encrypting and transmitting a content and a content reception device (5) for receiving the content. The content transmission device (3) has a content scrambling unit (7) for encrypting a content by using a scrambling key Ks, a content key Kc, a work key Kw, and a master key Km, and a multiplexing unit (9) for multiplexing the content and transmitting it as a multiplexed encrypted content. The content reception device (5) has an isolation unit (13) for receiving and isolating a multiplexed encrypted content, and a content descramble unit (15) for decoding the encrypted information isolated by the isolation unit (13) to obtain the content.