Invention Grant
US08290158B2 AV data transmission apparatus, AV data reception apparatus, and AV data transmission and reception system 有权
AV数据发送装置,AV数据接收装置,AV数据发送接收系统

AV data transmission apparatus, AV data reception apparatus, and AV data transmission and reception system
Abstract:
An AV data transmission apparatus includes an encryption unit which encrypts AV data, an AV data transmission unit which transmits the encrypted AV data, a cipher-type-information switching unit which switches cipher type information indicating a cipher scheme used for the AV data, to other cipher type information, and a cipher-type-information transmission unit which transmits cipher type information. When transmitting AV data which is prohibited from being used in a reception apparatus that does not support new usage control information, the AV data transmission apparatus assigns different cipher type information, which is used to notify the reception apparatus, so that even the reception apparatus which cannot recognize the new usage control information can recognize its inability to perform decryption is due to new encryption performed by the AV data transmission apparatus.
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