Until a significant portion of books from amazon come only in KFX format, I am not interested in writing conversion code for it. KFX is, and always will be, an inferior input format for conversion to KF8, because KFX is typically specialised for a particular device. This means that converting it will yield a book that is also specialised for the same class fo device.
If/when large numbers of DRM free/liberated KFX only books start to exist, it should be the work of a week or two to write a KFX input plugin for calibre.
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