Panasonic Corporation

Makoto Morise

Masayuki Kozuka

Motoji Ohmori

Toshihisa Nakano

Kaoru Murase

Takahiro Yamaguchi

Masataka Minami

Provided is a revocation list generation device that can suppress an increase in the amount of data of a revocation list. A revocation list generation device that generates a revocation list includes an acquisition unit that acquires, for a content, a revocation identifier identifying a revoked public key certificate allocated to an apparatus related to use of the content, a revocation list generation unit that generates a revocation list including the acquired revocation identifier associated with the content, and an output unit that outputs the revocation list.

Revocation list generation device, revocation list generation method, and content management system

A terminal device includes a transmission/reception unit that transmits, to a server device, information necessary for judgment as to whether to permit use of content. The server device includes a judgment unit that judges whether to permit the terminal device to use the content, based on terminal device management information set by a content provider, and the information necessary for the judgment and received from the terminal device. A notification data storage unit stores notifications to be presented to a user of the terminal device; and a transmission/reception unit transmits either information necessary for use of the content or one of the notifications according to a result of the judgment by the judgment unit.

Content management system, management server, memory media device and content management method

A storage unitof a recording medium devicestores a content and a revocation list. The revocation list includes a revocation identifier that is associated with the content and identifies a revoked public key certificate allocated to an apparatus related to use of the content. A controllerof the recording medium deviceis provided with an acquisition unitthat acquires, from an apparatus, an acquisition request for the content and an apparatus identifier identifying a public key certificate of the apparatus; a judgment unitthat judges whether the apparatus identifier matches a revocation identifier; and a control unitthat controls to prohibit output of the content to the apparatus when the apparatus identifier and the revocation identifier match.

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Osaka, Japan

Makoto Morise