Filtered Coward writes: Last summer, AT&T announced its intention to begin filtering copyrighted content at some point. The telecom has now bought a chunk of Vobile, whose core product is VideoDNA. "Like other systems of its kind, VideoDNA develops a unique signature from every frame of video. The signature is meant to be robust enough to survive various transformations and edits, and it can then be used to run matches against incoming content.' Vobile claims that VideoDNA is good enough to be used on video when transmitted over a network. 'Based on the complexity of the problem, we suspect that anything initially deployed by AT&T will fall far short of a robust P2P video filter. But should AT&T truly have its eyes on just such a prize, the company would be in a powerful position to impose its own policies on the entire US, since it owns major parts of the Internet backbone.'