I'm a strong advocate of a form of DRM that asserts the *rights* of the copyright owner without restricting the devices upon which the file can be viewed. Watermark the file in such a way that if it is found in a torrent or P2P sharing site it can be tracked back to the person who originally bought it. As everyone has noted, DRM seems to be more a challenge to programmers than a true deterrent to piracy.
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