Quote:
Originally Posted by RustyHill
Interestingly I now find (June 19th 2025) that some books I d/l to my K Paperwhite 12th Gen will not decrypt in Calibre anymore. They remain as KFK-ZIPs. This is with KFX Input 2.25.0 & DeDRM 10.0.9 under Calibre 8.4.0
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I suggest that you generate a log of importing one of those books to find out the underlying cause. It may not be DRM related. (See "Assessing the results after importing" in the first post of this thread for details.)
One common reason for this type of failure is missing files due to an incomplete download from Amazon caused by sending multiple books to the device too quickly. Those can be fixed by removing the book from the device and downloading it again from Amazon.