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You could require receivers to calculate a difficult problem where the difficulty was based on the "hate" people had for the content, similar to what Zed Shaw tried to do awhile ago with IRC (?).

Basically, each person that didn't like the content would spend some CPU time to up the difficulty of transferring it. After awhile, it'd take someone who wanted the content so long that they would give up, in which case the content wouldn't be transferred any more.

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