Version 6.6.3 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_6.6.3.zip can be downloaded from
This release includes the first support for Kindle for PC 1.25.1’s new key file, .kinf2018. As far as I can tell, this is essentially the same as the .kinf2011 file format, just a new name.
Whether the new key file in Kindle for Mac 1.25.1 is similarly just a file name change is not known at this time.
The release also includes improved cleaning of book name when converting book name to a file name.
Thanks to work by several people, the DeDRM calibre plugin can now decrypt KFX format ebooks from Amazon.
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.