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. 14, 2003
Filed:
Nov. 30, 1999
Applicant:
Inventors:
Mitsuaki Oshima, Kyoto, JP;
Yoshiho Gotoh, Osaka, JP;
Shinichi Tanaka, Tuzuki-gun, JP;
Kenji Koishi, Sanda, JP;
Mitsurou Moriya, Ikoma, JP;
Yoshinari Takemura, Settu, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 ;
U.S. Cl.
CPC ...
G11B 7/00 ;
Abstract
An optical disk recordable by a recording device and having first and second recording areas, the second recording area having recorded therein disk identification information unique to the disk, and multiple cipher keys, the first recording area being capable of having recorded therein information that is encrypted by using the disk identification information and one of the multiple cipher keys during recording.