Quote:
Originally Posted by pdurrant
The encryption keys for books downloaded to a physical Kindle are based on the Kindle's serial number. That's all the DeDRM plugin needs to be able to decrypt the books on the device. The serial number is obtained through the on-screen menus. On the Kindle I have in front of me, it's Menu/Settings/Device Options/Device Info
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kfx files cannot be DRM exempted, even with existing serial numbers.