The article How to Remove the DRM on Any Ebook You Own describes how to remove DRM from ebooks and states that it is legal to do so for your personal use. It is illegal to share copies of those ebooks. More importantly, I believe it is morally wrong.

The article mentions calibre (the developer spells it with lower case), a great ebook management program, in the process. It is important to say that calibre is not the program that removes DRM. The developer of calibre does not provide the plugin used. That comes from an unrelated developer.

The plugin works on a variety of publishing systems. The ebook needs to be downloaded rather than being sent directly to the ereader. On February 26th, 2025, Amazon discontinued the “Download and transfer via USB” option, so the instructions for how to do that has been removed from this page.