Marking a digitally encoded video and/or audio signal
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 10, 2000
Grant Date -
N/A
app pub date -
Oct 3, 1996
filing date -
Oct 4, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electronic watermarking scheme is proposed that can significantly increase the security of copy protection mechanisms. The watermarking methods works at high level in the hierarchy of the (MPEG) source signal. This ensures that the watermark is easily detectable, but difficult to erase without significant transcoding effort. Such transcoding is considered a difficult and expensive task that may furthermore lead to loss of quality or increase in bit rate.
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