The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2008
Filed:
Dec. 13, 2004
Revocation information updating method, revocation information updating apparatus and storage medium
Shunji Harada, Osaka, JP;
Makoto Tatebayashi, Takarazuka, JP;
Masayuki Kozuka, Arcadia, CA (US);
Teruto Hirota, Moriguchi, JP;
Toru Kamibayashi, Chigasaki, JP;
Masafumi Tamura, Choufu, JP;
Shunji Harada, Osaka, JP;
Makoto Tatebayashi, Takarazuka, JP;
Masayuki Kozuka, Arcadia, CA (US);
Teruto Hirota, Moriguchi, JP;
Toru Kamibayashi, Chigasaki, JP;
Masafumi Tamura, Choufu, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Kabushiki Kaisha Toshiba, Kanagawa, JP;
Abstract
At least one set of revocation information for identifying electronic appliances that should be revoked for content protection and master revocation information for identifying electronic appliances that have special permission to update the revocation information are recorded in advance into a special storage region on a storage medium. When the storage medium is loaded into an electronic appliance indicated by the master revocation information, the revocation information can be updated. However, when the storage medium is loaded into an electronic appliance indicated by the revocation information, the electronic appliance is revoked and so the protection of contents is improved.