Apple's eBook store will be using Fairplay DRM and B&N use eReader DRM. But every other eBook store that sell ePub with DRM use the standard Adobe Adept. Even Overdrive uses it. So if any device wants to allow users to read library borrowed ePub, they HAVE to support Adept DRM. And so far, the iPad is the only device that will support ePub that's an unknown as to Adept DRM. But, the iPod Touch and iPhone both have the txtr app that supports Adept DRM.
So it seems to me that ePub with Adept DRM has clearly won the format wars. Mobipocket could have won had they allowed Sony to use it along side BBeB on the 505.
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