Kindle
#Compatible version Calibre 4.23 DeDRM 6.6.3 https://github.com/apprenticeharper/DeDRM_tools
#Remove DRM
Prep: Calibre + Plugin(DeDRM), Kindle Serial Number, eBook with azw3 format.
For Calibre Install DeDRM plugin. Go to Plugins preference. Add the Kindle Serial Number to the Configuration.
Note: If you have .kfx format, you can't copy to device or to computer. In such case, download your book with awz3 format from amazon.com account, kindle web site. DeDRM works automatically when you IMPORT THE BOOK to calibre for the FIRST time.
Ref: https://apprenticealf.wordpress.com/2012/09/10/calibre-plugins-the-simplest-option-for-removing-most-ebook-drm/ https://medium.com/@angeldan1989/calibre-drm-removal-plugins-2019-remove-ebook-drm-with-calibre-4ec9c07cae80