The German Fraunhofer Institute gets a patent for transparent digital watermarking.
This digital watermarking is invisible to the normal eye. So you will not know if you try to copy a marked movie. The mark cannot be removed from the data without quality loss. The mark is integrated into the video data and cannot be removed without the key.This is great stuff for copyright holders to keep track of their videos.
More details and example watermarked videos on this Fraunhofer page. Via Heise (German).
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