Signal processing system, recording method, program, recording medium, reproduction device and information processing device

1. 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.

2. The signal processing system as set forth in claim 1 ,

wherein the reproducing apparatus further comprises a random number generating portion configured to generate a random number, and

wherein the intermediate key information includes the random number generated by the random number generating portion.

3. A recording method of a reproducing apparatus and an information processing apparatus for recording information to a recording medium, the reproducing apparatus being configured to read information from the recording medium having information unique thereto and the information processing apparatus being configured to mutually authenticate and connect the reproducing apparatus through a transferring portion, the recording method comprising the steps of:

causing the reproducing apparatus to generate a content information encryption key in accordance with intermediate key information;

causing the reproducing apparatus to transmit the intermediate key information to the information processing apparatus through the transferring portion;

causing the reproducing apparatus to transmit the content information encryption key to the information processing apparatus through the transferring portion;

causing the information processing apparatus to encrypt content information using the content information encryption key;

causing the information processing apparatus to encrypt the intermediate key information using key information unique to the recording medium, the key information being generated in accordance with information unique to the recording medium and a device key unique to the information processing apparatus; and

causing the information processing apparatus to record the encrypted content information and the encrypted intermediate key information to the recording medium.

4. The recording method as set forth in claim 3 , further comprising the step of:

causing the reproducing apparatus to generate a random number,

wherein the intermediate key information includes the random number.

5. A computer readable medium storing a computer program which when executed by a computer causes the computer to control a reproducing apparatus and an information processing apparatus for recording information to a recording medium, the reproducing apparatus being configured to read information from the recording medium having information unique thereto and the information processing apparatus being configured to mutually authenticate and connect the reproducing apparatus through a transferring portion, the computer program causing the computer to execute steps comprising:

causing the reproducing apparatus to generate a content information encryption key in accordance with intermediate key information;

causing the reproducing apparatus to transmit the intermediate key information to the information processing apparatus through the transferring portion;

causing the reproducing apparatus to transmit the content information encryption key to the information processing apparatus through the transferring portion;

causing the information processing apparatus to encrypt content information using the content information encryption key;

causing the information processing apparatus to encrypt the intermediate key information using key information unique to the recording medium, the key information being generated in accordance with information unique to the recording medium and a device key unique to the information processing apparatus; and

causing the information processing apparatus to record the encrypted content information and the encrypted intermediate key information to the recording medium.

6. The computer readable medium as set forth in claim 5 , further comprising:

causing the reproducing apparatus to generate a random number,

wherein the intermediate key information includes the random number.

7. A reproducing apparatus, connected to an information processing apparatus through a transferring portion, for reading information from a recording medium having information unique thereto, the reproducing apparatus comprising:

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;

a second transmitting portion configured to transmit the content information encryption key to the information processing apparatus through the transferring portion,

wherein the reproducing apparatus is mutually authenticated with the information processing apparatus and connected thereto, the information processing apparatus comprising 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 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.

8. The reproducing apparatus as set forth in claim 7 , further comprising:

a random number generating portion configured to generate a random number, and

wherein the intermediate key information includes the random number generated by the random number generating portion.

9. An information processing apparatus connected to a reproducing apparatus through a transferring portion, the reproducing apparatus being configured to read information from a recording medium having unique information, the information processing apparatus being mutually authenticated with the reproducing apparatus and connected thereto through the transferring portion, the reproducing apparatus comprising 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, the information processing apparatus comprising:

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 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.

10. The information processing apparatus as set forth in claim 9 ,

wherein the reproducing apparatus further comprises a random number generating portion configured to generate a random number, and

wherein the intermediate key information includes the random number generated by the random number generating portion.

11. A reproducing apparatus, comprising:

at least one of a recording portion configured to record encrypted data to a recording medium having pre-recorded first information for invalidating an illegal electronic device, second information that differs in each content, third information definable for each encrypted unit, and identification data that differs in each stamper and a reproducing portion configured to reproduce encrypted data recorded on the recording medium;

a storing portion configured to store fourth information unique to a valid electronic device or application software;

a revoking processing portion configured to determine whether the fourth information is information unique to a valid electronic device or application software using the first information and the fourth information;

a calculating portion configured to obtain intermediate key information unique to each recording medium using the first information, the fourth information, the second information, and the identification data when the determined result of the revoking processing portion represents that the fourth information is information unique to a valid electronic device or application software; and

a transmitting portion configured to transmit the intermediate key information to the final encryption key generating portion of an information processing apparatus through a transferring portion.

12. The recording and reproducing apparatus as set forth in claim 11 , further comprising:

an authenticating portion configured to mutually authenticate a data processing apparatus configured at least to encrypt data or to decrypt encrypted data using a key generated in accordance with the intermediate key information; and

an intermediate key information encrypting portion configured to encrypt the intermediate key information using a session key generated when the authentication has been successfully performed and to transmit the encrypted intermediate key information to the data processing apparatus.

13. A data processing apparatus, comprising:

an authenticating portion configured to authenticate a recording and reproducing apparatus, the recording and reproducing apparatus having fourth information unique to a valid electronic device or application software, and configured at least to record encrypted data to a recording medium having pre-recorded first information for invalidating an illegal electronic device, second information that differs in each content, third information definable for each encrypted unit, and identification data that differs in each stamper or to reproduce encrypted data recorded on the recording medium;

a key information decrypting portion configured to receive the first information, the fourth information, and intermediate key information from the recording and reproducing apparatus and to decrypt the intermediate key information, the first information and the fourth information having been encrypted using a session key generated when the authentication has been successfully performed, the intermediate key information being unique to each recording medium and generated using the second information and the identification data;

a final encryption key generating portion configured to generate a final encryption key using the third information received from the recording and reproducing apparatus and the decrypted intermediate key information; and

an encrypting and decrypting portion configured at least to encrypt data using the final encryption key or to decrypt data using the final encryption key.