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Seems like the only way to make this a "DRM" system is to make your 2 choices "Delete" or "Pay now," no "read on" option until you pay. Otherwise, you just need a bit of text in the front that states the copyright date and the public domain date, don't bother with the buttons, and depend on honest people to delete or pay something--which, we already know, most of them will not bother to do.
I'm not sure if most people are unaware of the legality of e-books before they download them. But once they have the e-book, I don't think they particularly care about "doing the right thing," and I do know that guiltware generally doesn't work without real consequences attached.
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