what I have seen is that a user might have purchased 100 books from Amazon. Stripped the drm from them all and edited the meta data in Calibre.
Then the user gets a new Kindle and registers it to the account. The new Kindle shows 100 items in the archive. The user uploads 20 items to the new Kindle from the Calibre library but downloads no books from the archive. After this the new Kindle only shows 80 items in the archive.
I am curious as to how Amazon is recognizing these documents as being on the new Kindle.
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