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I got a chuckle from jimlynch's answer, and I'm not one to disagree with the teaching of Old Ben. As a practical matter, it is likely that the push for laws like SOPA is motivated by a desire to impose on third parties a duty to seek out any copyright violations for the film/music industry and force the third parties to take steps without requiring specific action from the industry. Who wouldn't want to force literally everyone to seek out material you objected to? Plus, if they didn't, they would face penalties imposed by the federal government through force of law. It's like a wish for a digital version of communist East Germany, where everyone was informing on everyone.