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I don't know what you mean by "you don't actually own the books"; you "own" them as much as you own any own digital download. Back them up yourself if you're really that worried. You have to rights to the content, which means that you can't, say, re-sell them, any more than you can re-sell an iTunes download. That's true for pretty much anything that you download, and it's true for all eBook stores just as much as for Amazon.
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