[input_sh]

Kindle's DRM is breakable for at least half a decade now using this calibre plugin: https://apprenticealf.wordpress.com/

I find it more convenient to break it than DRM-protected ePub files sold elsewhere (Barnes and Noble, Kobo, etc.).

[izacus]

Except that the new Kindle DRM is very hard to remove and this plugin won't work anymore - it's a constant arms race where us customers are always the losers.

[imgabe]

It's possible, if a little annoying. In your account settings, Amazon offers the ability to download an e-book to transfer via USB. This gets you a version that you can import into Calibre and process with DeDRM.