I guess my next questions is where I can find a summary of all the ePub "standards" that a common ebook buyer can buy. If I buy an ePub from someone other than Amazon (obviously), is it the same file and drm (or no drm) as anyone else? Is it one standard, or a lot of flavors, with different drm schemes, depending on who you get it from, and are these cross platform compatible? Please enlighten me.
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