This makes perfect sense: .epub for DRM-free, .epuba for Adobe DRM, .epube for eReader DRM, etcetera. It would be in FictionWise's interest to use .epube (say) because that reduces the confusion over a 2nd DRM scheme. They also have gone through this in spades with .pdb. The problem is that Adobe has already "squatted" on .epub for ePub with Adobe DRM.
One approach would be to somehow get Adobe to stop using .epub for ePubs with Adobe DRM. Or we could standardize on .epubf (say) for DRM-free ePub. I was concerned that Adobe Digital Editions would not accept this, but the Windows version does not care what the extension is. However, you currently can't add .epubf files to the ADE library.
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