Thread: Dealing with Kindle for PC/Mac 1.19 and KFX in calibre
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Old 06-20-2020, 09:02 AM   #843
jhowell
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Posts: 7,121
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Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
Quote:
Originally Posted by darryl View Post
Barring a sneaky update to 1.28 it appears that an alternate DRM scheme was included in that version and possibly some of the preceding versions after 1.24.3. It may be as simple as another key hidden in the software, an alternate decryption algorithm or both. As jhowell said, on the fly changes to DRM.
Amazon seems to be relying more and more on remotely triggered features. There is the dark mode icon slowly rolling out on Kindle devices, the missing cover thumbnails for sideloaded books, and now the enabling of new KFX DRM.

Since the alternative KFX DRM has now been activated, it is only a matter of time before it too is cracked. If Amazon is really serious about KFX DRM they will likely be adding at least one more hidden DRM scheme in upcoming software releases in order to prepare for that eventuality.
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