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