Quote:
Originally Posted by HarryT
This is not so. Buy an ePub book from iBooks and a Nook won't read it; buy one from B&N and a Kobo won't read it. There are at present three different, mutually-incompatible ePub DRM mechanisms in use.
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iBooks doesn't count. It's not true ePub under the hood. It's quite non-standard at times. So really, count it's books out of the picture.
So this actually makes just two ePub DRM formats.