Quote:
Originally Posted by Dulin's Books
if it was me(and if i were trying to implement something of this sort- which im not) i would find a way to corrupt the files if the tag/mark was removed to make them unreadable or have a way to corrupt the copies when found. make them self-destructing.
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You'd need to invent your own format or DRM for that. epub is basically a bunch of HTML and XML files in a ZIP archive. After it's been extracted, there's really no way you could corrupt the files unless you include a malware of some sort...