Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2007-06-06
2009-10-27
Kim, Jung (Department: 2432)
Cryptography
Video cryptography
Video electric signal modification
Reexamination Certificate
active
07609836
ABSTRACT:
In a video on demand (VOD) system, methods and apparatus are provided for seamlessly switching back and forth between two pre-encrypted files having changing encryption keys Such switching back and forth may be required when a VOD server stores both a “normal” copy of a movie and a “special” copy such as a “trick-play” version for, e g, fast forward and rewind effects Instead of using keys with changing parities in both streams, the special stream is encrypted with keys using the same parity (even or odd), while the normal stream is encrypted with one dynamic key (odd or even) and one fixed key (even or odd) Other special streams, such as scene branch streams and alternate angle streams can also be accommodated.
REFERENCES:
patent: 5742681 (1998-04-01), Giachetti et al.
patent: 2002/0108035 (2002-08-01), Herley et al.
patent: 1022900 (2000-07-01), None
patent: 2001015448 (2001-03-01), None
patent: WO 0215579 (2002-02-01), None
PCT International Search Report for PCT/US03/17970. Dated Sep. 10, 2003.
“Guide to the Use of the ATSC Digital Television Standard” Ref: XP-002255337, Advanced Television Systems Committee. Doc. A/54, dated Oct. 4, 1995. pp. 1-136.
Forms PTO-892 - Notices of References Cited for U.S. Appl. No. 10/455,835. US Patent No. 7,317,794.
Office Actions for U.S. Appl. No. 10/455,835. US Patent No. 7,317,794.
Cullen Larry T.
General Instrument Corporation
Kim Jung
Lemma Samson B
LandOfFree
Seamless switching between multiple pre-encrypted video files does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Seamless switching between multiple pre-encrypted video files, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Seamless switching between multiple pre-encrypted video files will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4098415