Dedrm_plugin.zip -

ElleKayEm commented. ... After you unzip DeDRM_tools_6. 7.0. zip, rename the unzipped folder something like "unzipped DeDRM tools"

: Often requires "Customization" within calibre to work, such as entering a physical Kindle serial number or using specific decryption keys. Installation Guide

Invalid Plugin does not contain top-level init.py file #1076 - GitHub

: Removes protection from Kindle eBooks, Adobe Digital Editions (ADE) ePubs, Barnes & Noble ePubs, and older Mobipocket/eReader formats.

Could not install plugin on windows calibre, Im a new user #2111

: DRM removal only happens at the moment a book is imported into calibre. It will not work on books already in your library unless you remove and re-import them.