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:
Aug. 30, 2005
Filed:
Apr. 28, 2000
Takahiro Nagai, Osaka, JP;
Hideshi Ishihara, Osaka, JP;
Yuji Takagi, Osaka, JP;
Takashi Yumiba, Kyoto, JP;
Mamoru Shoji, Osaka, JP;
Mitsuaki Oshima, Kyoto, JP;
Shunji Ohara, Osaka, JP;
Motoshi Ito, Osaka, JP;
Takashi Ishida, Kyoto, JP;
Atsushi Nakamura, Osaka, JP;
Tadashi Jahana, Kanagawa, JP;
Kouhei Nakata, Hyogo, JP;
Takahiro Nagai, Osaka, JP;
Hideshi Ishihara, Osaka, JP;
Yuji Takagi, Osaka, JP;
Takashi Yumiba, Kyoto, JP;
Mamoru Shoji, Osaka, JP;
Mitsuaki Oshima, Kyoto, JP;
Shunji Ohara, Osaka, JP;
Motoshi Ito, Osaka, JP;
Takashi Ishida, Kyoto, JP;
Atsushi Nakamura, Osaka, JP;
Tadashi Jahana, Kanagawa, JP;
Kouhei Nakata, Hyogo, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A recording type optical disk on which data is recordable includes a data recording and reproducing area for recording data therein and reproducing data therefrom, and a read-only disk identification information area for recording disk identification information for identifying the optical disk therein. In the optical disk, the disk identification information is formed by removing a reflection film that is formed on the optical disk in a strip shape. The disk identification information includes an inherent disk identifier for each optical disk, and the data recording and reproducing area includes an area for recording encrypted data therein. The encrypted data is encrypted by using information including the disk identification information for identifying the optical disk as a key.