Hmmmm... lots to think about. I could certainly finish my book much faster if I just made it reflowable. I wonder about the possibility of creating a reflowable version and inserting an ad announcing a fixed layout version (probably at a higher price). Perhaps I could even offer discounts to people who have purchased the reflowable version. Is it possible to somehow put unique ID's in epubs, so you can keep track of purchases? In other words, someone could tell me they own a book with the serial number 10028, and I could verify that that number exists in a database.
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