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:
Mar. 18, 2008
Filed:
Dec. 21, 2001
Tomoyuki Asano, Kanagawa, JP;
Yoshitomo Osawa, Kanagawa, JP;
Tateo Oishi, Saitama, JP;
Ryuji Ishiguro, Tokyo, JP;
Ryuta Taki, Kanagawa, JP;
Tomoyuki Asano, Kanagawa, JP;
Yoshitomo Osawa, Kanagawa, JP;
Tateo Oishi, Saitama, JP;
Ryuji Ishiguro, Tokyo, JP;
Ryuta Taki, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
An information processing system and method are disclosed in which information processing is performed using an enabling key block (EKB) in association with a tree structure including category subtrees. A key tree is produced, which include subtrees that are grouped in accordance with categories and are managed by category entities. The EKB includes data produced by selecting a path in the key tree and encrypting a higher-level key in the selected path using a lower-level key in the selected path. The EKB is then provided to a device. A requester, which requests production of the EKB, may produce a root key or may request a key distribution center (KDC) to produce a root key. If the (KDC) produces the EKB, it may also request a category entity to produce a sub-EKB.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile