Cryptography – Communication system using cryptography – Time segment interchange
Reexamination Certificate
2006-08-01
2006-08-01
Vu, Kim (Department: 2135)
Cryptography
Communication system using cryptography
Time segment interchange
C370S485000, C370S486000, C370S487000, C713S181000
Reexamination Certificate
active
07085377
ABSTRACT:
Audio or other information is delivered to a user via a multi-stream digital broadcasting system in a partially-encrypted form. The information is encoded and separated into multiple bitstreams, at least a subset of which are left unencrypted. Both the encrypted and unencrypted bitstreams are received and stored by the user. A user is able, for at least a limited period of time, to access the information at a first quality level, e.g., an FM-quality level for audio information, without having the corresponding decryption key, by utilizing only the unencrypted bitstreams. The user can then access an electronic-commerce web site to purchase the decryption key. The key may be downloaded from the site to an information processing device of the user, and may be utilized to decrypt the partially-encrypted format, such that the user is provided with access to the information at a second quality level higher than the first quality level, e.g., a CD-quality level for audio information. The multiple bitstreams may correspond, e.g., to subbands of at least first and second digital sidebands of a host carrier signal in an FM in-band on-channel (FM-IBOC) digital audio broadcasting system.
REFERENCES:
patent: 3580989 (1971-05-01), Banning, Jr.
patent: 4494142 (1985-01-01), Mistry
patent: 5173900 (1992-12-01), Miller et al.
patent: 5267021 (1993-11-01), Ramchandran et al.
patent: 5740246 (1998-04-01), Saito
patent: 5751806 (1998-05-01), Ryan
patent: 5818934 (1998-10-01), Cuccia
patent: 5909238 (1999-06-01), Nagashima et al.
patent: 5949796 (1999-09-01), Kumar
patent: 6026164 (2000-02-01), Sakamoto et al.
patent: 6041068 (2000-03-01), Rosengren et al.
patent: 6370507 (2002-04-01), Grill et al.
patent: 6385596 (2002-05-01), Wiser et al.
patent: 6405338 (2002-06-01), Sinha et al.
patent: 6434746 (2002-08-01), Nagashima et al.
patent: 6445693 (2002-09-01), Sarraf et al.
patent: 6529526 (2003-03-01), Schneidewend
patent: 0 917 367 (1999-05-01), None
patent: 0 918 408 (1999-05-01), None
patent: 00 30 6081 (2005-04-01), None
Menezes et al, Handbook of Applied Cryptography, 1997, pp. 20.
Sinha et al, Unuqual Error Preotection Methods for Perceptual Audio Coders, 1999 IEEE International conference on vol. 5, pp. 2423-2426.
P. Kafka, “Play it Again,” http://www.forbes.com, Jul. 1999.
J.R. Garber, “Albums and Alpo,” http://www.forbes.com, Jul. 1999.
D. Sinha, J.D. Johnston, S. Dorward and S.R. Quackenbush, “The Perceptual Audio Coder,” in Digital Audio, Section 42, pp. 42-1 to 42-18, CRC Press, 1998.
B.W. Kroeger and A.J. Vigil, “Improved IBOC DAB Technology for AM and FM Broadcasting,” SBE Engineering Conference, pp. 1-10, 1996.
B.W. Kroeger and D. Cammarata, “Robust Modem and Coding Techniques for FM Hybrid IBOC DAB,” IEEE Transactions on Broadcasting, vol. 43, No. 4, pp. 412-420, Dec. 1997.
B.W. Kroeger and P.J. Peyla, “Compatibility of FM Hybrid In-Band On-Channel (IBOC) System for Digital Audio Broadcast,” IEEE Transactions on Broadcastig, vol. 43, No. 4, pp. 421-430, Dec. 1997.
Gyorfi Thomas
Lucent Technologies - Inc.
Vu Kim
LandOfFree
Information delivery in a multi-stream digital broadcasting... 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 delivery in a multi-stream digital broadcasting..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Information delivery in a multi-stream digital broadcasting... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3676348