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I have a devilish solution, but it requires some programming. Dynamical generate each epub. I;ve though of several places you can add your information: The names of the directories and files, the names of the attributes (class, div, etc.), or, more evil-y, edit the fonts. Add a series of characters in there that is always the email or something. As for obscuring the data you want to add, which you should do to make it non-obvious, simply encrypt each piece. Oh, another thing I've heard of it directly adding on a zip file to a picture. It's supposed to be ignored, and then by recording the byte size you can just take that much of the end to recover it.
That'd take some work, but each should work fine. Positively brilliant, methinks. But I doubt you will implement any of those methods. Another would be using svg images with text embeded in them set to display at 100% transparency; svg's can even have fonts, so you could hide one there. The possibilities are endless!
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