Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2005-02-08
2005-02-08
Moise, Emmanuel L. (Department: 2131)
Cryptography
Video cryptography
Video electric signal modification
C380S044000, C380S239000, C360S015000, C386S349000
Reexamination Certificate
active
06853727
ABSTRACT:
Copy protection is provided at a mass storage device provided in or connected to a decoder for receiving digital transmissions of audio and video program material by virtual scrambling of blocks of data. Non-sequential storage locations for blocks of data are defined in accordance with a key and the file allocation table is encrypted and stored. Thus blocks of data remain intact and need not be decrypted upon playback, reducing processing time, while the program is effectively protected from reassembly without decryption of the file allocation table. The key(s) may be maintained internally within the decoder and need not be shared, thus avoiding a need for user identification and/or authentication. Software for encryption, including keys may be downloaded to the decoder through the same transmission link used for transmission of data files that may be encrypted in response to control signals or flags transmitted with data files to be protected.
REFERENCES:
patent: 5619571 (1997-04-01), Sandstrom et al.
patent: 5631693 (1997-05-01), Wunderlich et al.
patent: 5673373 (1997-09-01), Nosaki et al.
patent: 5732239 (1998-03-01), Tobagi et al.
patent: 5745643 (1998-04-01), Mishina
patent: 5886841 (1999-03-01), Kikuchi et al.
patent: 0 908 810 (1999-04-01), None
patent: 0908810 (1999-04-01), None
patent: WO 9935562 (1999-07-01), None
patent: WO 9944364 (1999-09-01), None
Foster Eric M.
Franklin Dennis E.
Lam Wai Man
Losinger Raymond E.
Ngai Chuck H.
Arani Taghi T.
International Business Machines - Corporation
Moise Emmanuel L.
Steinberg William H.
Whitham Curtis & Christofferson, P.C.
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