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As I understand it the DRM can only be removed by the original purchaser, or with their assistance.
Given this, publishers could cut down on piracy considerably by automatically coding a serial number that would identify the purchaser or borrower of the book in a number of very hard to find ways (such as steganography in the cover picture, blank space or via options that make no difference in the format codes etc.) but would not otherwise affect readability. These would remain in place after the DRM was removed.
This is a similar idea to the identifiers in phots and maps, except it would identify the purchaser.
Once word got around that ebooks could be traced then pirate uploads of deDRM'd books would dry up.
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