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:
Feb. 03, 2004
Filed:
Dec. 28, 1998
Hideo Owa, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical disc ( ) has a plurality of sectors each including a header area and a recording area, in which a position where a predetermined amount of data is recorded provides an ID information (medium ID peculiar to the optical disc). The ID information in the optical disc ( ) is used by a first encryption circuit ( ) to encrypt a disc key to encrypt AV data as a whole, the encrypted disc key is used by a second encryption circuit ( ) to encrypt a sector key to encrypt the AV data for each program, and the encrypted sector key is used by a third encryption circuit ( ) to encrypt the AV data for each program. The AV data subjected to at least the first to third encryptions is recorded into the recording area of the optical disc ( ).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile