DRM'ed ePub would basically be "Kindle" format-Amazon won't adopt someone else's DRM.
Non DRM'ed ePub...I'm curious, outside of the relatively small market of people here liberating their various formats to ePub, what is the market for non-DRM'ed ePub format? Gutenberg, etc. all support .mobi already.
I do like etienne66's point that one format, pre-DRMed, might make life easier/more consistent for publishers, regardless of what DRM they add on afterwards.
But for general users? I'm pretty impressed at how skillfully Amazon has handled the whole DRM/proprietary format issue-better than any other company I can think of. Putting a free Kindle app on computers, phones, and tablets is a master stroke-and changes the conversation.
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