That there is likely no drm on some kfx ebooks has been demonstrated earlier by people loading the same downloaded kfx files on different Kindles. The problem seems to be the obfuscation, though not itself DRM, prevents even non-drm files from being converted. If, as an author, you go exclusively with Amazon and opted for no drm owners of epub readers have hitherto still been able to buy the book from Amazon and convert. This of course remains the case with kf8, but not kfx.
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