Marking a video and/or audio signal
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United States of America Patent
Stats
-
Aug 17, 1999
Grant Date -
N/A
app pub date -
Dec 9, 1996
filing date -
Dec 11, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method and arrangement for marking a video or audio signal to assign a classification to said signal, for example, to identify that the signal is authentic and may not be copied. The signal comprises at least two components (Y, UV) according to a predetermined standard (MPEG, PAL, NTSC). According to the invention, values are assigned to said components which in combination can normally not occur. For example, in black picture portions where Y, U and V are all zero, U and/or V are now wilfully made non-zero to constitute the watermark. Television receivers still display said black portion. The watermark is not lost when the signal is re-encoded and copied on a recordable disc. A player will not reproduce the copy because the watermark no longer corresponds with the 'wobble key' of the new disc.
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Family
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Cited Art Landscape
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