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Amazon offers DRM as an option. If they didn't have that option none of the big 5 would let Amazon distribute their books.
I do believe a couple of other ebook sellers require their security (drm) attached to all their files. I think Apple and Google are two of them?
Now on the other side, why should books only be epub? What about pdf? Or do you consider that a document file?
What is so great about epub?
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