Quote:
Originally Posted by ownedbycats
Is this by title/author, or something else?
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I am not certain. I would guess ASIN or something else embedded and perhaps not read by Calibre. Since this is avoidable by returning or removing the book according to your Amazon account, I have not experimented much with any other method.
I believe that I once had success converting a book to EPUB to prevent it being auto-pruned from my Kindle, which suggests to me the metadata in question is embedded and not immediately visible/editable to Calibre.