Authentication communication system, authentication communication apparatus, and authentication communication method

An authenticating apparatus, for use with a responder, for communicating with the responder after authentication, the authenticating apparatus comprising:

• a storage unit operable to store, in advance, revocation information that indicates a revoked apparatus;
• a judgement unit operable, in authentication with the responder, to judge, based on the revocation information, whether or not the responder is revoked;
• and
• a communication unit operable to prohibit communication with the responder when the responder is judged to be revoked, and communicate with the responder when the responder is judged not to be revoked.

An authenticating apparatus, for use with a responder, for communicating with the responder after authentication, the authenticating apparatus comprising:

• a storage unit operable to store, in advance, revocation information that indicates a revoked apparatus, the revocation information having been generated based on a certificate revocation list obtained via a recording medium;
• a judgement unit operable, in authentication with the responder, to judge, based on the revocation information, whether or not the responder is revoked;
• and
• a communication unit operable to prohibit communication with the responder when the responder is judged to be revoked, and communicate with the responder when the responder is judged not to be revoked.

An authenticating apparatus, for use with a target apparatus, for communicating with the responder after authentication, the authenticating apparatus comprising:

• an obtaining unit operable to read a certificate revocation list from a recording medium;
• a judgement unit operable to judge, based on the read certificate revocation list, whether or not the responder is revoked;
• a storage unit;
• and
• a generation unit operable, when the responder is judged to be revoked, to generate revocation information indicating that the responder is revoked, and write the generated revocation information to the storage unit.

An authenticating method used in an authenticating apparatus that communicates with a responder after authentication, wherein

• the authenticating apparatus comprises a storage unit operable to store, in advance, revocation information that indicates a revoked apparatus, the revocation information having been generated based on a certificate revocation list obtained via a recording medium;
• and
• the authenticating method comprises:
• judging, in authentication with the responder, and based on the revocation information, whether or not the responder is revoked;
• and
• prohibiting communication with the responder when the responder is judged to be revoked, and communicating with the responder when the responder is judged not to be revoked.

An authenticating program used in a computer that communicates with a responder after authentication, wherein

• the computer comprises a storage unit operable to store, in advance, revocation information that indicates a revoked apparatus;
• and
• the authenticating program comprises instructions for the computer to:
• judge, in authentication with the responder, and based on the revocation information, whether or not the responder is revoked;
• and
• prohibit communication with the responder when the responder is judged to be revoked, and communicate with the responder when the responder is judged not to be revoked.

An authenticating program recorded on a computer-readable recording medium used in a computer that communicates with a responder after authentication, wherein

• the computer comprises a storage unit operable to store, in advance, revocation information that indicates a revoked apparatus;
• and
• the authenticating program comprises instructions for the computer to:
• judge, in authentication with the responder, and based on the revocation information, whether or not the responder is revoked;
• and
• prohibit communication with the responder when the responder is judged to be revoked, and communicate with the responder when the responder is judged not to be revoked.

A copyrights protection system comprising an authenticating apparatus and a responder between which a digital work is transferred after authentication,

• the authenticating apparatus being operable to:
• store, in advance, revocation information indicating a revoked apparatus;
• judge, in authenticating the responder, and based on the revocation information, whether or not the responder is revoked;
• prohibit communication with the responder when the responder is judged to be revoked;
• and
• perform transfer of the digital work with the responder when the responder is judged not to be revoked;
• and
• the responder being operable to perform transfer of the digital work with the authenticating apparatus when the responder is not revoked.