Data processing: financial – business practice – management – or co – Business processing using cryptography – Usage protection of distributed data files
Reexamination Certificate
2005-03-08
2005-03-08
Cosimano, Edward R. (Department: 3629)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Usage protection of distributed data files
C705S050000
Reexamination Certificate
active
06865553
ABSTRACT:
An apparatus and method of copy protection for use in digital data recorders such as DVD-RAM recorders, which includes embedding transmission time information into a digital data stream by digital watermarking and comparing the transmission time with the current time at the data recorder (30, 50). If the time difference is less than a threshold value it is presumed that the recording is for time-shifting purposes, namely recording a programme to watch later, which is generally allowed by copyright laws. If the time difference is greater than a threshold value it is presumed that the recording is an attempted unauthorized recording such as from a pre-recorded copy, and further recording is prevented.
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Morito Hajime
Roe Michael
Yoshiura Hiroshi
Cosimano Edward R.
Hitachi , Ltd.
Mattingly ,Stanger ,Malur & Brundidge, P.C.
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