Patent ID: 8275169

Claim:
A transmission device for transmitting an encrypted moving image data to a reception device, the transmission device comprising: an encryption unit configured to generate the encrypted moving image data; a control unit configured (a) to request that the reception device transmits a processing capability of a decryption unit to the transmission device, wherein the decryption unit is configured to decrypt the encrypted moving image data and is included in the reception device, and (b) to change a transfer rate of the encrypted moving image data to one of a first transfer rate and a second transfer rate based on the processing capability transmitted from the reception device to the transmission device, wherein the second transfer rate is lower than the first transfer rate; and a transmission unit configured (a) to transmit the encrypted moving image data to the reception device using the first transfer rate if the transfer rate of the encrypted moving image data is changed to the first transfer rate, and (b) to transmit the encrypted moving image data to the reception device using the second transfer rate if the transfer rate of the encrypted moving image data is changed to the second transfer rate.