Quote:
Originally Posted by mr ploppy
MD5, etc wouldn't really work on a pirate ebook because it would change when the DRM restrictions were removed.
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Many, if not most, pirate ebooks aren't made by removing DRM restrictions, but by scanning paper books.
Also, in that case the database would just have two entries for that book, one with DRM, the other one after it was removed - or wouldn't include DRMed books at all (I don't know exactly how DRMed books work, it's possible that the resulting DRM-ed file from the same book would be different for every user).
Edit: though I remember I read here once about books being offered for free, but with DRM (so requiring to have an account on the site, and often also working credit card, even if there would be no charge for the book).