I think it is partially designed to stop or trace the professional pirate who release hundreds of science, music, sports books etc every day onto pirate sites, possibly from sources within the publisher. It will make it more difficult for them to source the originals. Its not really for catching someone with a few books hacked from his computer. Of course all DRM can be got around, the idea is to make it more difficult for the professional pirate, and a bit more scary for the amateur pirate.
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