Cryptography – Key management
Reexamination Certificate
2004-06-17
2009-06-30
Vu, Kim (Department: 2435)
Cryptography
Key management
C380S054000, C380S200000, C380S210000, C713S193000, C726S027000
Reexamination Certificate
active
07555129
ABSTRACT:
A content playback apparatus prevents related content recorded on separate media that make up a virtual package from being played separately, thereby restricting playback of the content to only when the virtual package is assembled as intended by the creator, and protecting copyright of the content. A key obtaining unit obtains a second key, with use of key management information recorded on a recording medium on which related content relating to the encrypted content is also recorded. An information obtaining unit obtains the encrypted content and key generation information that relates to generation of the first key, from a source other than the recording medium. A key generation unit generates the first key with use of the second key and the obtained key generation information. A decryption unit decrypts the encrypted content with use of the first key.
REFERENCES:
patent: 5796839 (1998-08-01), Ishiguro
patent: 5825876 (1998-10-01), Peterson, Jr.
patent: 6438235 (2002-08-01), Sims, III
patent: 7225339 (2007-05-01), Asano et al.
patent: 2001/0033656 (2001-10-01), Gligor et al.
patent: 2002/0012430 (2002-01-01), Lim
patent: 2002/0076204 (2002-06-01), Nakano et al.
patent: 2002/0087818 (2002-07-01), Ripley et al.
patent: 2003/0202658 (2003-10-01), Verbauwhede
patent: 2004/0109569 (2004-06-01), Ellison et al.
patent: 2004/0136536 (2004-07-01), Michtchenko
patent: 1 185 022 (2002-03-01), None
patent: 1 185 023 (2002-03-01), None
patent: 1 215 844 (2002-06-01), None
patent: 1 271 839 (2003-01-01), None
patent: 2000-285592 (2000-10-01), None
patent: 2002-015511 (2002-01-01), None
patent: 2002-281013 (2002-09-01), None
patent: 96/11446 (1996-04-01), None
patent: WO 9611446 (1996-04-01), None
patent: 00/51119 (2000-08-01), None
patent: 01/56221 (2001-08-01), None
patent: 02/095747 (2002-11-01), None
patent: 03/032300 (2003-04-01), None
J. Daemen et al., “AES Proposal: Rijndael”, AES Proposal, Sep. 3, 1999, pp. 1-45.
Ohmori Motoji
Saso Atsushi
Watanabe Kazuhisa
Yamamichi, legal representative Keiko
Yamamichi, legal representative Masami
Paliwal Yogesh
Panasonic Corporation
Vu Kim
Wenderoth , Lind & Ponack, L.L.P.
LandOfFree
Content playback apparatus, content playback method, and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Content playback apparatus, content playback method, and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Content playback apparatus, content playback method, and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4141474