Patent ID: 8737487

Claim:
An information processing apparatus comprising: a first processing circuit, including a hardware circuit, configured to decode encoded stream data including audio data and video data input to the first processing circuit and to detect tampering on encryption information, the first processing circuit being configured to add a tamper flag to tampered data only if tampering is detected; a second processing circuit configured to perform a predetermined process on data output from the first processing circuit into the audio data and the video data, and to add tamper information indicating the data has been subjected to tampering to the processed data only if the data includes the tamper flag; and a third processing circuit configured to receive data output from the second processing circuit and process the received data such that when the received data does not include tamper information, the received data is processed in a normal manner, but when the received data includes tamper information added thereto, the received data is processed differently from the normal manner such that data output by the third processing circuit when tamper information has been added is different than data output by the third processing circuit when tamper information has not been added.