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A comment on Show HN: Epub.to – ePub to pdf, mobi, Kindle, and an API. Parent comment

Re:Show HN: Epub.to – ePub to pdf, mobi, Kindle, and an API by rofrol on Tuesday February 09, 2021 @06:13AM (#26076143)
April 2018: As of version 6.6.0, Apprentice Alf's DRM removal tools support Amazon's newer .kfx file format. You'll also need to install the KFX conversion plugin(link is external) to import your .kfx files into Calibre.

https://www.geoffstratton.com/remove-drm-amazon-kindle-books

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Re:Show HN: Epub.to – ePub to pdf, mobi, Kindle, and an API by criddell on Wednesday February 10, 2021 @12:40PM (#26092285)
The GitHub repo for the DRM removal tools is here:

https://github.com/apprenticeharper/DeDRM_tools

The README says this:

> Note that DRM can only be removed from KFX format files downloaded with Kindle for PC/Mac 1.26 or earlier. Amazon changes the DRM for KFX files in Kindle for PC/Mac 1.27 and later.

KFX is different from older versions in that the file is tailored to the device it is downloaded on. If you download with the Kindle for PC, the file is optimized for your big, high resolution screen and isn't going to be great on an eink device.

There are no cracks that work with the KFX files extracted from the Kindle reader.

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