What Joykins says is correct. I assumed that you were familiar with DRM (which stands for Digital Rights Management and is an anti-piracy thing) and its removal, Ann, because Calibre will not even add a DRMed book to its catalog unless one of these drm-removal plugins is enabled. It just refuses to do it, telling you that the book has DRM.
So, without removing the DRM, to my knowledge you cannot do ANYTHING to a book with Calibre, whether it's a Kindle book, a Nook book, or whatever.
Folks are reluctant to talk about drm-removal (myself included) on these forums for a number of good reasons, but you can find info about it without much difficulty by doing some searching.
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