When Amazon launched the newest version of its Kindle ebook format in 2015, the improved typography and hyphenation came at a price. Each KFX ebook was delivered as a collection of files with no obvious details other than unfamiliar file suffixes and a new type of DRM.
That new DRM was unbreakable, and that caused a lot of problems for those who want to protect their purchases. This problem only intensified last year when Kindle for PC gained support KFX and made it harder to download a Kindle ebook that could be deDRMed, but now we have a solution.
The latest version of the Apprentice Alf DRM-stripping tools was released last week, and it now works on KFX ebooks.
According to the blog post, this is a beta release:
This release incorporates works by several people to give initial KFX support to the plugin. If you are not interested in removing DRM from the new Kindle KFX format, then there is no need to update at this time. We still recommend using the older Kindle formats when possible for more successful conversion into other formats.
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.
You can download the files from Github. Bug reports should be left on the Apprentice Alf blog.