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:
Oct. 28, 2008
Filed:
Apr. 02, 2001
Ryuji Ishiguro, Tokyo, JP;
Yoshitomo Osawa, Kanagawa, JP;
Tateo Oishi, Saitama, JP;
Tomoyuki Asano, Kanagawa, JP;
Atsushi Mitsuzawa, Tokyo, JP;
Ryuji Ishiguro, Tokyo, JP;
Yoshitomo Osawa, Kanagawa, JP;
Tateo Oishi, Saitama, JP;
Tomoyuki Asano, Kanagawa, JP;
Atsushi Mitsuzawa, Tokyo, JP;
Sony Corporation, , JP;
Abstract
A content key, an authentication key, and a program data etc. are transmitted with an enabling key block (EKB) in an encrypted key constitution of a tree structure. The EKB has a constitution in which a device as a leaf of the tree holds a leaf key and a limited node key, and a specific enabling key block (EKB) is generated and distributed to a group specified by a specific node to limit devices that can be renewed. As the devices that do not belong to the group cannot perform decryption, the security for distributing keys etc. can be secured. Thus, distribution of various kinds of keys or data is executed in an encryption key constitution of a tree structure to realize an information processing system and method enabling to distribute data efficiently and safely.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile