Data processing: financial – business practice – management – or co – Business processing using cryptography – Usage protection of distributed data files
Reexamination Certificate
2011-03-29
2011-03-29
Fischer, Andrew J. (Department: 3621)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Usage protection of distributed data files
C725S037000
Reexamination Certificate
active
07917442
ABSTRACT:
A disk bears a multimedia program and a player plays the program. The player is responsive to an image restraint token (IRT) to play the multimedia program only in a low resolution format and not in a high resolution format prior to an IRT expiration date. The player is then responsive to a key that is publicly available only on or after the expiration date and entered into the player to play the multimedia program in the high resolution format.
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Coppola Jacob C.
Fischer Andrew J.
Rogitz John L.
Sony Corporation
Sony Electronics Inc.
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