| 摘要 |
Watermarks are added to data streams (e.g., video streams) to enable improved detection and thereby prevention of the theft of such data streams. In one embodiment, different watermarks are added at two or more different stages along a primary distribution path in order to determine at what location a particular copy of the video stream diverged, if at all, from the primary distribution path prior to the end of the path. In this way, a particular copy of a video stream can be analyzed to determine who was the intended end user of the video stream. These features can be implemented to aid in the detection of content theft and, through related deterrent effects, aid in the prevention of such theft in the first place.
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