Thread: KFX Format
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Old 09-21-2017, 11:17 AM   #630
jhowell
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Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
Quote:
Originally Posted by darryl View Post
Is it then the case that all kfx files can now be decrypted? That we know how Amazon is deriving its keys for kfx books with drm?
Yes. The sample code handles all KFX books downloaded using the latest Kindle for PC program, even those with DRM restrictions.

Quote:
Originally Posted by JSWolf View Post
So how is this supporting older devices that do support KF8 like the Kindle Touch and Kindle Keyboard?
The cases I have seen are with books that use EPUB features that are not supported by the MOBI and KF8 renderers. Rather than update those renderers to support those features Amazon is instead restricting books with those features to be KFX only.
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