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Back to the subject you seem to want to discuss: Amazon file formats.
The Topaz file format is much, much worse than KFX in all ways. And yet that was decoded. Because it was necessary.
AZW4 is a wrapped PDF. That's also worse than KFX for conversion to other formats.
As for freedom to change format - Amazon have always had that option. It's how they've gone from just Mobi to Mobi + Topaz to Mobi + Topaz + KF8 to Mobi + Topaz + KF8 + MobiPDF to Mobi + Topaz + KF8 + MobiPDF + KFX.
Currently there isn't an easy way to decrypt and convert KFX. You seem convinced that because there isn't one now there'll never be one. My experience suggests that you're wrong.
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