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To the first part of the question: it is not feasible to stop piracy. While nothing is impossible, file sharing in one form or another can't be stopped without eliminating all of the mechanisms that facilitate it, up to and including the internet, email, photocopiers and even monk scribes.
At best you can mitigate the amount of piracy by making it:
1) difficult (copy protection),
2) scarey (filing very public lawsuits),
3) unfashionable (shaping public opinion)
4) impractical (low priced legitimate copies), and my favorite,
5) disappointing (source pollution)
I'm sure there are other ways, but most are just variations on the above themes.
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