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The key to future-proofing is buying DRM-free ebooks.
Even stripping the DRM isn't the same, because by buying DRM-restricted ebooks, you're voting in favor of DRM. And if the booksellers find that we're willing to accept DRM, they'll just make it harder and harder to break, until they finally succeed with their goal of total device lock-in, and probably renting us books on a weekly basis instead of selling them at all.
Aside from that, I'd bet on epub. It's being pushed as a universal standard, which might give it an edge over the more proprietary formats. PDF is good, too, except that it really blows for ebooks, at least on 6" or smaller readers.
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