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:
Feb. 22, 2005
Filed:
Aug. 14, 2000
Nobuhiro Hayashi, Kanagawa, JP;
Munekatsu Fukuyama, Tokyo, JP;
Nobuhiro Hayashi, Kanagawa, JP;
Munekatsu Fukuyama, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
An information recording medium and information processing device capable of preventing recording and reproduction of information by unauthorized users not possessing a genuine licensed disk device. A public key for a particular medium and a secret key are recorded on a medium and, a secret key for deciphering the encoding is recorded on a normally inaccessible region of the medium to prevent a user from downloading and altering the secret key with external commands. Information encoded by the public key of a particular device can only be decoded by the secret key of this device or a decipher key decodable only by the secret key, and recording or reproduction of decoded data is only possible on the genuine licensed device, and illegal recording or reproduction of data can therefore be prevented.