Thread: Dealing with Kindle for PC/Mac 1.19 and KFX in calibre
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Old 06-05-2020, 01:36 PM   #790
jhowell
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Posts: 7,101
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Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
Amazon has made two separate DRM changes that are not yet handled by the current version of the DRM Tools.

Kindle for PC and Mac versions 1.25 and later store the encryption key needed to decode books in a file named ".kinf2018", which is protected using a new encryption scheme. It appears that a solution for this has been found for the PC app. It is not yet known whether it can also be applied to Kindle for Mac.

Kindle for PC/Mac 1.25 and e-ink Kindle firmware 5.10.2 and later also include a new DRM scheme for books in KFX format. Even if the main key can be recovered from .kinf2018 files the question still remains of how to use it to decode the new KFX DRM. No one has reported any progress on this as far as I know.
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