Removing DRM

From Amazon Kindle ebooks

Read https://www.epubor.com/3-ways-to-remove-drm-from-kindle-books.html

Download https://github.com/noDRM/DeDRM_tools/

Install the plugin in Calibre

Download your Kindle books from https://www.amazon.com/hz/mycd/digital-console/contentlist/booksAll/dateDsc/

From Audible Audiobooks

ffmpeg -y -activation_bytes <your-activation-bytes> -i audible_drm_file.aax -codec copy drm-free-file.m4b