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:
Jul. 10, 2007
Filed:
Oct. 18, 2001
Taizo Shirai, Tokyo, JP;
Yoshihito Ishibashi, Tokyo, JP;
Kenji Yoshino, Tokyo, JP;
Toru Akishita, Chiba, JP;
Taizo Shirai, Tokyo, JP;
Yoshihito Ishibashi, Tokyo, JP;
Kenji Yoshino, Tokyo, JP;
Toru Akishita, Chiba, JP;
Sony Corporation, Tokyo, JP;
Abstract
Between a data recording/playback device and a data storage device, CBC-mode encryption processing is executed which encrypts a plurality of encryption keys of content which correspond to sectors. The encrypted data is stored in a header corresponding to the content. The CBC-mode encryption processing is executed by using a storage key unique to media in which the content is stored. For using the content, only by decrypting the key data in media in which mutual authentication is established, the content can be used, so that highly-secure key storage is implemented.