Cryptography – Key management – Having particular key generator
Reexamination Certificate
2008-01-15
2008-01-15
Vu, Kim (Department: 2135)
Cryptography
Key management
Having particular key generator
C380S045000, C380S277000, C713S189000, C713S193000, C726S026000
Reexamination Certificate
active
09947097
ABSTRACT:
An information recording/playback device stores beforehand, on a recording medium, secret information in which a writing/reading method thereof cannot be analyzed and which can be read only by a special reading method. The secret information is applied to a key for content encryption or decryption when performing recording or playback of contents on the recording medium, such as music data and image data. The secret information is, for example, a stamper ID. By using the stamper ID as secret information, and a master key and a media key which are distributed in a tree-structure key-distribution system, a content-cryptosystem key is generated. Accordingly, each content is allowed to be used in only an appropriate device in which the special reading method for the secret information can be executed and to which the key is distributed by the tree-structure key-distribution system.
REFERENCES:
patent: 5588058 (1996-12-01), Le Berre
patent: 5724327 (1998-03-01), Timmermans et al.
patent: 5752009 (1998-05-01), Nakahara et al.
patent: 5792009 (1998-08-01), Maruko
patent: 5915018 (1999-06-01), Aucsmith
patent: 6134384 (2000-10-01), Okamoto et al.
patent: 6223285 (2001-04-01), Komuro et al.
patent: 6230268 (2001-05-01), Miwa et al.
patent: 6289102 (2001-09-01), Ueda et al.
patent: 6307936 (2001-10-01), Ober et al.
patent: 6611812 (2003-08-01), Hurtado et al.
patent: 6622132 (2003-09-01), Oshima et al.
patent: 6665240 (2003-12-01), Kobayashi et al.
patent: 6687683 (2004-02-01), Harada et al.
patent: 6834349 (2004-12-01), Higurashi et al.
patent: 6859535 (2005-02-01), Tatebayashi et al.
patent: 6868404 (2005-03-01), Ono et al.
patent: 6938162 (2005-08-01), Nagai et al.
patent: 2001/0042043 (2001-11-01), Shear et al.
patent: 2002/0001385 (2002-01-01), Kawada et al.
patent: 2002/0015494 (2002-02-01), Nagai et al.
patent: 0 561 685 (1993-09-01), None
patent: 0 809 244 (1997-11-01), None
patent: 0 874 503 (1998-10-01), None
patent: 1 005 026 (2000-05-01), None
patent: 11-224461 (1999-08-01), None
patent: 1 013 241 (2000-04-01), None
Patent Abstracts of Japan, vol. 1999, No. 13, Nov. 30, 1999 & JP 11 224461 A (SONY CORP), Aug. 17, 1999.
Waldvogel M et al: “The Versakey Framework: Versatile Group Key Management” IEEE Journal on Selected Areas in Communications, IEEE Inc. New York, US, vol. 17, No. 9, Sep. 1999, pp. 1614-1631, XP002942949 ISSN: 0733-8716.
Hitachi, Ltd. et al., 5C Digital Transmission Content Protection White Paper, Jul. 14, 1998, Rev 1.0.
Asano Tomoyuki
Osawa Yoshitomo
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Shaw Yin-Chen
Sony Corporation
Vu Kim
LandOfFree
Information recording device, information playback device,... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Information recording device, information playback device,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Information recording device, information playback device,... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3952020