Calibre version 2.40.0 (2015-10-02) added support for reading the unencrypted metadata from books on e-ink kindles in KFX format. From the release notes:
Quote:
Kindle driver: Detect books in Amazon's new KFX format present on e-ink kindles.
Note that this only detects KFX books and allows you to delete them. You cannot copy them to your calibre library. Doing so would be pointless anyway, as KFX books are specialised for individual devices. Instead go to your 'Manage my content' page an amazon.com and download them from there -- this will give you a regular azw3 file you can add to calibre.
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There continues to be no support in calibre for converting KFX to other formats. There are also no tools that can deal with KFX DRM. (And all KFX books from Amazon come with DRM.)