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:
Mar. 06, 2012
Filed:
Mar. 10, 2004
Toshihisa Nakano, Neyagawa, JP;
Masato Yamamichi, Ota, JP;
Masami Yamamichi, Legal Representative, Ota, JP;
Satomi Yamamichi, Legal Representative, Ota, JP;
Keiko Yamamichi, Legal Representative, Maebashi, JP;
Yuichi Futa, Osaka, JP;
Motoji Ohmori, Hirakata, JP;
Makoto Tatebayashi, Takarazuka, JP;
Shunji Harada, Osaka, JP;
Kaoru Murase, Nara, JP;
Toshihisa Nakano, Neyagawa, JP;
Masato Yamamichi, Ota, JP;
Masami Yamamichi, legal representative, Ota, JP;
Satomi Yamamichi, legal representative, Ota, JP;
Keiko Yamamichi, legal representative, Maebashi, JP;
Yuichi Futa, Osaka, JP;
Motoji Ohmori, Hirakata, JP;
Makoto Tatebayashi, Takarazuka, JP;
Shunji Harada, Osaka, JP;
Kaoru Murase, Nara, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A recording and reproduction apparatus for preventing illegitimate use of contents. A recording medium stores an inherent number in an unrewritable area. The recording apparatus writes media key data and an encrypted content onto the recording medium. The media key data includes encrypted media keys generated by (i) for each of unrevoked reproduction apparatuses, encrypting a media key using a device key of the unrevoked reproduction apparatus respectively, and (ii) for each of revoked reproduction apparatuses, encrypting detection information using a device key of the revoked reproduction apparatus. The reproduction apparatus decrypts the encrypted media key using a device key to generate a decryption media key, judges whether the decryption media key is the detection information, and prohibits the encrypted content recorded on the recording medium from being decrypted when judged in the affirmative.