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:
Jan. 29, 2008
Filed:
Apr. 10, 2003
Ryuji Ishiguro, Tokyo, JP;
Keiko Tada, Kanagawa, JP;
Motomasa Futagami, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
The present invention relates to an information processing apparatus and method and to a program for reliably preventing unauthorized use of content even in the case of a low-throughput content storage device. A CPU selects content to be stored on a content storage device. In step S, the CPU verifies a first digital signature added to the content. A storage unit stores a usage right. In step S, the CPU searches the storage unit for the usage right. In step S, the CPU verifies a second digital signature added to the usage right. The CPU generates alteration detecting data on the basis of information included in the usage right. In step S, when the content and the usage right are unaltered, the CPU outputs the usage right, the alteration detecting data, and the content to the content storage device. The present invention is applicable to clients in a DRM system.