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Each video camera leaves a certain signature mark, much like a fingerprint or striation markings on bullets in gun barrels. Same goes for CD-ROM Burners, they leave a trace or type of Cookies on the finished product.
These are tested by computer and not visible by the naked eye. Experts here after lunch have concluded that one of the 2 video cameras used in the Nick Berg "beheading" was also used to film US troop abuses of Iraqi detainees.
Kodak Invisible watermarking:
With this technology, every screening of every digitally projected movie could have its own unique code. This code, which is buried in the pixels, is invisible to the audience but is copied into the pirated version. These ‘watermarks’ provide the ‘fingerprints’ for tracing where and when the movie was stolen.
...the watermark can survive the actual process of capturing a projected movie with a camcorder. Moreover, the amplitude of the Kodak watermark is such that it is invisible to the viewer in the theater, thus maintaining the image quality that is such an important part of the movie-going experience. In the ShoWest demo, 16 bits of information were embedded in each frame of the movie, and it took less than 15 frames (0.5 sec) of captured video to extract the 16 bits with 100% reliability. Often, the watermark was successfully extracted using fewer than 15 frames, sometimes only one or two frames.