Quote:
Originally Posted by dwig
Given that the epub file would have to be readable by some epub reader (app or device) it isn't practical to add any additional encryption to the epub file. If you did, you'd have to create your own reader app that could handle the unlocking.
The most practical approach would be to put the epub inside of some other "locked box" (ZIP archive, ...) that could be password locked.
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Once the epub is removed from the zip, which it must be to use it, it's utterly unprotected and distributable. That sounds like just what he doesn't want.