Version 6.7.0 of the tools is now available. Please update to the latest version if you are having issues. To leave a comment, see the previous post: DRM Removal Tools for eBooks.
DeDRM_tools_6.7.0.zip can be downloaded from
This release should fix a compatibility problem with the latest release version of calibre and KFX files.
This release DOES NOT handle Kindle for Mac/PC 1.25 and later.
This release DOES NOT work with the latest calibre beta that requires Python 3 for plugins.
This release release DOES DROP SUPPORT for the stand-alone DeDRM apps. Only the calibre plugins are now included. (& the separate python scripts).
Thanks to work by several people, the DeDRM calibre plugin can decrypt KFX format ebooks from Amazon as long as they are downloaded with Kindle for Mac/PC prior to version 1.25.
Install the KFX Input plugin to automatically locate all of the files that make up a KFX format book and gather them into a KFX-ZIP. After the DeDRM plugin removes the DRM, then the KFX Input plugin will package it into a single KFX file.
See this post at the MobileRead calibre forum for more information on dealing with the KFX format.