For info had real trouble trying to de drm some books I just bought from Amazon. Have done many others, using unswindle so I know my setup is fine. I was getting an error saying PID not found. As someone mentioned it appears that Amazon have changed some of their encryption basing it on the Kindle's serial number generating a spurious PID number in the file. Using the new tools v3 the calibre plug in fails as well. Using the new tool found in version 3 simply called "KindleBooks" entering the device serial worked and it de drmd the book. Thought I would let others know as it took me over two hours of searching and trial and error before I solved this.
Cheers
Barney
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