Data processing: financial – business practice – management – or co – Business processing using cryptography – Usage protection of distributed data files
Reexamination Certificate
2005-02-01
2005-02-01
Hayes, John W. (Department: 1612)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Usage protection of distributed data files
C705S051000, C705S054000, C380S201000, C713S153000, C713S158000
Reexamination Certificate
active
06850914
ABSTRACT:
At least one set of revocation information for identifying electronic appliances that should be revoked for content protection and master revocation information for identifying electronic appliances that have special permission to update the revocation information are recorded in advance into a special storage region on a storage medium. When the storage medium is loaded into an electronic appliance indicated by the master revocation information, the revocation information can be updated. However, when the storage medium is loaded into an electronic appliance indicated by the revocation information, the electronic appliance is revoked and so the protection of contents is improved.
REFERENCES:
patent: 4740890 (1988-04-01), William
patent: 5400319 (1995-03-01), Fite et al.
patent: 5599431 (1997-02-01), Scorpio
patent: 5805551 (1998-09-01), Oshima et al.
patent: 5805699 (1998-09-01), Akiyama et al.
patent: 5857021 (1999-01-01), Kataoka et al.
patent: 5892900 (1999-04-01), Ginter et al.
patent: 6092201 (2000-07-01), Turnbull et al.
patent: 6128740 (2000-10-01), Curry et al.
patent: 6233341 (2001-05-01), Riggins
patent: 6278836 (2001-08-01), Kawara et al.
patent: 6324518 (2001-11-01), Katsurabayashi et al.
patent: 6418421 (2002-07-01), Hurtado et al.
patent: 6421779 (2002-07-01), Kuroda et al.
patent: 20010021255 (2001-09-01), Ishibashi
patent: 20010021926 (2001-09-01), Schneck et al.
patent: 20020035492 (2002-03-01), Nonaka
patent: 0930556 (1999-07-01), None
patent: 2000-357126 (2000-12-01), None
patent: 2001-166996 (2001-06-01), None
Rosen, Michele, “IBM Proposes Foundation for Electronic Commerce”, MIDRANGE Systems, vol. 9, No. 8, p. 32, May 24, 1996.*
O'Connor, Mary Ann, “New Distribution Option for Electronic Publishers”, CD-ROM Professional, vol. 7, No. 2, pp. 134-135, Mar. 1994.
Harada Shunji
Hirota Teruto
Kamibayashi Toru
Kozuka Masayuki
Tamura Masafumi
Hayes John W.
Kabushiki Kaisha Toshiba
Matsushita Electric - Industrial Co., Ltd.
LandOfFree
Revocation information updating method, revocation... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Revocation information updating method, revocation..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Revocation information updating method, revocation... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3483819