Version 6.8.0 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_6.8.0.zip can be downloaded from
This release adds full support for the new .kinf2018 key files and the new KFX encryption. Many thanks to Apprentice Sakuya for their work on this.
This means that this release now works with the latest (1.28) version of Kindle for PC and Kindle for Mac.
***Update: Amazon has made changes to the KFX encryption since this release which affect Kindle for PC/Mac versions 1.27 and later. This release should work on all books downloaded with Kindle for PC/Mac version 1.26 or earlier. Books which require the later versions of Kindle for PC/Mac will not be able to be decrypted at this time.***
A script to remove DRM from B&N PDFs has been included but not integrated into the plugin, nor tested.
This release DOES NOT work with the latest calibre beta that requires Python 3 for plugins.
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 1.27.
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.