I've never really seen a raw, non-DRM'd iBooks file - but I've seen plenty of EPUBs that look like they were 'made' for iBooks....so - are they really that different?
I thought rumor was iBooks WERE just ePUBs with some Apple-specific things to render some fancy stuff (when EPUB spec was slower to adopt things).
I could be way off. The EPUBs with iBooks stuff in them could just be files ready to be 'imported' into iBooks - which then could do more conversion stuff (like Amazon EPUB to Kindle conversion).
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