Well, I don't know why you converted all your books, an EPUB-to-EPUB conversion is typically done in order to pummel a badly-formatted book into shape -- for people who don't edit it themselves.
An EPUB-to-EPUB conversion is definitely not needed for DeDRM purposes.
But yes, if you have an ORIGINAL_EPUB it means you converted and now you have two copies of the book.
The regular EPUB is the newly-converted one, the ORIGINAL_EPUB is of course the original.
You can right-click on the ORIGINAL_EPUB in calibre and restore it, or delete it. Depends on which one you want to keep.
Last edited by eschwartz; 11-08-2015 at 04:23 AM.
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