I had a moment of braveness or foolishness and tried the Nook's built-in delete function rather than using Calibre as I usually do, to clear out books I'd sideloaded and read; and lo, the Nook doesn't even see the sideloaded books (or anything, viewing all not just viewing "books") as available to delete, it only showed me the purchased books/downloaded book samples I'd gotten from BN.
I would guess this is a hamfisted way to keep the Nook from deleting too much, but it's strange.
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