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:
Mar. 20, 2001
Yoshihiro Tosaki, Osaka, JP;
Akira Matsubara, Kyoto, JP;
Tomiharu Hosaka, Kyoto, JP;
Toshiaki Kunieda, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A write-once DVD has a lead-in area provided inside a data area where digital information on a document, image sound or the like is recorded, which includes prepits holding copy managing key information for preventing unauthorized copy from a source disk to the DVD . The DVD has also a test area provided inside the lead-in area , which is used for adjusting the power characteristics of the DVD . In the DVD , information recorded in the source disk can be. physically prevented from being copied into the DVD without good cause on the basis of the copy managing key information recorded in the prepits