Very good news everyone. Thanks to Apprentice Sakuya, whoever you are. His latest commit seems to solve the problem with decrypting Amazon books. I was able to successfully decrypt both a Public Domain kfx book and a book officially protected by DRM. All using the Kindle App version 1.28.0 on Windows 10. This results in the import to Calibre of a .kfx file (not a kfx-zip). The Calibre viewer cannot read the kfx file, but the file can be converted to another format (I tried .azw3 and epub) which the viewer of course will read.
Be aware that the tools on Apprentice Harper's github have, at the time of posing, not been updated to include Apprentice Sakuya's commits. There will no doubt be a new version released soon.
Please remember that kfx is not the best format to convert from, for reasons which have been discussed on Mobileread in the past. The results in relation to the books I tested seem to be fine on a cursory examination.
Once again thanks to Apprentice Sakuya. I look forward to others reporting on their results.
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