Researchers at Tel Aviv University have devised a way to develop a video DNA that will allow video players to not play pirated movie content. Today?s anti-piracy mechanism relies on a digital signature inside the original disc, but pirates have been able to circumvent this anti-piracy measure by just video taping the movie from a screen to get around the digital signature. With the video DNA, footage would be analyzed in grids to see what visual elements are there, and the shots would get a unique DNA code. The system can scan websites and discs for the code, even if the colors or footage have been changed, modified, or altered.
source:
http://www.ubergizmo.com/2010/12/vid...-from-playing/