Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2006-04-06
2010-06-01
Smithers, Matthew B (Department: 2437)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
Reexamination Certificate
active
07730329
ABSTRACT:
To render content on a medium, a device obtains a table from the medium, obtains a private key of the device (PR-PD), indexes into an entry of the table based thereon, obtains (PU-PD(RND)) from the indexed-into entry of the table, and applies (PR-PD) to (PU-PD(RND)) to expose a random key (RND). Then, the device obtains (RND(PR-PM)) from the table, applies (RND) to (RND(PR-PM)) to expose a private key of the medium (PR-PM), obtains (PU-PM(KD)) from the license, applies (PR-PM) to (PU-PM(KD)) to expose a content key (KD), obtains (KD(content)) from the storage medium, applies (KD) to (KD(content)) to expose the content.
REFERENCES:
patent: 5715403 (1998-02-01), Stefik
patent: 6002772 (1999-12-01), Saito
patent: 6550011 (2003-04-01), Sims, III
patent: 2001/0021255 (2001-09-01), Ishibashi
patent: 2002/0013772 (2002-01-01), Peinado
patent: 2002/0136407 (2002-09-01), Denning et al.
patent: 2002/0152393 (2002-10-01), Thoma et al.
patent: 2002/0161997 (2002-10-01), Yamasaki et al.
patent: 2003/0140227 (2003-07-01), Asano et al.
patent: 11-328033 (1999-11-01), None
patent: 2000-113048 (2000-04-01), None
patent: 2002-149061 (2002-05-01), None
patent: WO 00/57684 (2000-10-01), None
patent: WO 00/58811 (2000-10-01), None
patent: WO 00/59150 (2000-10-01), None
patent: WO 01/52021 (2001-07-01), None
Griswold, G.N. “A Method for Protecting Copyright on Networks”,Infologic, 1-11.
Kahn, R.E. “Deposit, Registration and Recordation in an Electronic Copyright Management System”,ARL, Jul. 3, 2002, 6 pages.
Molotkov, S.N. et al., “On the key generation for N users in quantum crytography”,JETP Letters, 1995, 62(12), 959-964.
Rivest, R.L. “The RC5 encryption algorithm”, Dr. Dobb's Journal, 1995, 20(1), 146-148.
Wheeler, D.J. “A bulk data encryption algorithm”,Cambridge Security Workshop. Fast Software Encryption,Dec. 9-11, 1993, Publication Date 1994, 127-134, INSPEC Abstract No. C9502-6130S-023.
U.S. Appl. No. 09/892,371, filed Jun. 27, 2001, Peinado.
Naor, D. et al., “Revocation and Tracing Schemes for Stateless Receivers,” Jul. 2001, http://eprint.iacr.org, 33 pages.
Intel Corporation et al., Content Protection for Prerecorded Media Specification, DVD Book, Revision 0.93, 4C Entity LLC, Jan. 31, 2001, 21 pages.
Intel Corporation et al., Content Protection for Prerecorded Media Specification, Introduction and Common Cryptographic Elements, Revision 1.0, 4C Entity LLC, Jan. 17, 2003, 25 pages.
Ganesan Krishnamurthy
Helin Jonas Fredrik
Strom Clifford P.
Abyaneh Ali S
Microsoft Corporation
Smithers Matthew B
Woodcock & Washburn LLP
LandOfFree
Digital rights management (DRM) encryption 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 Digital rights management (DRM) encryption and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital rights management (DRM) encryption and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4188957