Patent ID: 7421742

Claim:
A signal processing system having a reproducing apparatus for reading information from a recording medium having unique information and an information processing apparatus for mutually authenticating and connecting the reproducing apparatus through a transferring portion, wherein the reproducing apparatus comprises: a final encryption key generating portion configured to generate a content information encryption key in accordance with intermediate key information; a first transmitting portion configured to transmit the intermediate key information to the information processing apparatus through the transferring portion; and a second transmitting portion configured to transmit the content information encryption key to the information processing apparatus through the transferring portion, and wherein the information processing apparatus comprises: a content information encrypting portion configured to encrypt content information using the content information encryption key; an intermediate key information encrypting portion configured to encrypt the intermediate key information using key information unique to the recording medium, the key information being generated in accordance with the information unique to the recording medium and a device key unique to the information processing apparatus; and a recording portion configured to record the encrypted content information and the encrypted intermediate key information to the recording medium.