Cryptography – Communication system using cryptography – Time segment interchange
Reexamination Certificate
2011-01-25
2011-01-25
Zand, Kambiz (Department: 2434)
Cryptography
Communication system using cryptography
Time segment interchange
C380S202000
Reexamination Certificate
active
07876895
ABSTRACT:
A unified broadcast encryption system divides a media key tree into S subtrees, divides digital content into segments, and converts some of the segments into variations; the number of segments and variations is q. The system subdivides each of the subtrees into q/|S| subdivided subtrees, assigns a key media variant to each of the subdivided subtrees, and generates a unified media key block (MKBu). The system decrypts digital content by obtaining required key media variants from the MKBu, using the key media variant to find an entry in a variant key table, decrypt a title key, and locate a variant number from the variant key table. The system uses the variant number to identify which of the variations may be decrypted by the title key and uses the title key to decrypt segments and variations.
REFERENCES:
patent: 5548648 (1996-08-01), Yorke-Smith
patent: 6886098 (2005-04-01), Benaloh
patent: 2002/0133701 (2002-09-01), Lotspiech et al.
patent: 2002/0147906 (2002-10-01), Lotspiech et al.
patent: 2003/0142826 (2003-07-01), Asano
patent: 2003/0198351 (2003-10-01), Foster et al.
patent: 2004/0109569 (2004-06-01), Ellison et al.
patent: 2006/0078110 (2006-04-01), Kim et al.
patent: 2006/0129490 (2006-06-01), Collar et al.
patent: 2006/0153381 (2006-07-01), Kim et al.
patent: 2006/0184796 (2006-08-01), Fahrny
patent: 2008/0152134 (2008-06-01), Asano
patent: 2003273862 (2003-09-01), None
Dalit Naor, Moni Naor, Jeff Lotspiech: “Revocation and Tracing Schemes for Stateless Receivers” [Online] 2001, XP002491877 USA Retrieved from the Internet: URL: http://www.iacr.org/archive/crypto2001/21390040.pdf> [retrieved on Aug. 12, 2008] Cited in the application the whole document.
Lotspiech J et al: “anonymous Trust: Digital Rights Management Using Broadcast Encryption” Jun. 1, 2004, Proceedings of the IEEE, IEEE. New York, US, pp. 898-909, XP011113011 ISSN: 0018-9219 abstract.
Patent Cooperation Treaty International Search Report and the Written Opinion dated Aug. 22, 2008.
Jin Hongxia
Lotspiech Jeffrey Bruce
International Business Machines - Corporation
Kassatly Sam
Shimokaji & Assoc.
Tabor Amare
Zand Kambiz
LandOfFree
System, method, and service for performing unified broadcast... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System, method, and service for performing unified broadcast..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System, method, and service for performing unified broadcast... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2672555