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Originally Posted by FrustratedReader
A kepub is NOT an epub! Not as far as uploading to Smashwords or Amazon or the epub based ereaders I have. No doubt that's why the Kobo extended Driver on Calibre leaves the epubs unchanged in library and does on the fly conversion,
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The extended driver does the kepub transformation on the fly because at the time it was developed, there was little point in storing kepub anywhere other than on a Kobo device. Nothing else uses them, and while the spans added don't really harm anything, they are a nuisance if you edit the book.
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which is not the same as some Kobo kepubs, as they will have no formating not in the epub.
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No idea what you mean here. Are you comparing Kobo produced kepubs against those generated by the extended driver? If so, most purchased kepubs I have seen pretty well match the epub they also make available. Occasionally, I see differences, but, it is obvious that different versions of the book were supplied to Kobo versus what went to the ACSM servers.