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. 11, 2005
Filed:
Jan. 22, 2002
Applicant:
Seiichi Nakamura, Inagi, JP;
Inventor:
Seiichi Nakamura, Inagi, JP;
Assignee:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 900 ;
U.S. Cl.
CPC ...
Abstract
A data copy control method is applied to a computer system that has a reproducing device which receives reproducing data read out by a drive device. A shared key is produced in the drive device and the reproducing device. The reproducing data in the drive device is enciphered using copy control data read out by the drive device and the shared key. The enciphered reproducing data and the copy control data are transferred to the reproducing device. The enciphered reproducing data is deciphered using the copy control data received by the drive device and the shared key.