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Trying ways to tie documents to devices will, quite simply, never work as a deterrent to file sharing. All of these schemes are ultimately a wasted effort, doomed to failure.
Unfortunately, we are a long way from security methods that would work (think biometrics), so the music and book industries both are just going to have to get used to the idea that their market is going to be very "fuzzy" for awhile. But that might be a good thing, because it might encourage them to rebuild and evolve their businesses after (in books' case) about a century of relative inactivity.
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