Quote:
Originally Posted by pdurrant
I believe the DeDRM plugin only operates on import, not viewing. (Viewing a Kindle book in calibre first converts it to an equivalent ePub in the background. This can't happen for books without DRM.)
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A Kindle book, yes, but not an epub.
The OP imported their Nook books (epubs) to Calibre and then installed the deDRM plugin. The viewer is able to open them (they're epubs), but the Quality Check plugin apparently indicates some books have DRM, i.e. it has not been removed.