Copy protection apparatus and method
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United States of America Patent
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-
Oct 30, 2001
Grant Date -
N/A
app pub date -
Mar 16, 1999
filing date -
Mar 19, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
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 unauthorised recording such as from a pre-recorded copy, and further recording is prevented.
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