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I work in the education sector, and if I were to purchase yoour book I would love if it were epub - but with figures properly inserted so that they scale up and down with the font size (most epub publishers don't bother, though it can be done, and is a major issue).
Good luck!
(and yes, I agree that no DRM is going to hold very long, but if the textbook is fairly price, I would expect people to buy it).
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