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. 03, 2009
Filed:
Dec. 04, 2003
Applicant:
Satoshi Kitani, Tokyo, JP;
Inventor:
Satoshi Kitani, Tokyo, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L 9/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A device keyis implemented on a driveside. To securely transmit the device keyto a hostthe device keyis encrypted with a bus key. The hostside decrypts the device key with the bus key. A medium unique key calculating blockcalculates a medium unique key with an MKBa medium ID, and the decrypted device keyWhen the calculated medium key is a predetermined value, the driveis revoked and the process is stopped. The medium unique key is supplied to an encrypting/decrypting moduleA content key is obtained with an encrypted title keyand a CCIWith the content key, an encrypted content is decrypted and a content that is recorded is encrypted.