Patent ID: 7853802

Claim:
An information processing system, comprising: a first information processing apparatus transmitting a content having a video signal and an audio signal; and a second information processing apparatus receiving the content; wherein said first information processing apparatus includes a first key generator configured to generate a first key, a video encryptor configured to encrypt the video signal with the first key generated by the first key generator in accordance with a predetermined system, an audio encryptor configured to encrypt the audio signal with the first key generated by the first key generator in accordance with the predetermined system and a transmitter configured to transmit the content having the video signal encrypted by the video encryptor and the audio signal encrypted by the audio encryptor; and wherein said second information processing apparatus includes a receiver configured to receive the content transmitted from said first information processing apparatus, a second key generator configured to generate a second key corresponding to the first key, a video decryptor configured to decrypt the encrypted video signal included in the content received by the receiver with the second key generated by the second key generator in accordance with the predetermined system, and an audio decryptor configured to decrypt the encrypted audio signal included in the content received by the receiver with the second key generated by the second key generator in accordance with the predetermined system, wherein the predetermined system is an AES (Advanced Encryption Standard) cipher and each of said key generator, said video encryptor, and said audio encryptor performs processing in accordance with SMPTE 427M “Link Encryption for 1.5 Gb/s1 Serial Digital Interface”.