I'm having the same problem. What I really don't get is that it's only happening with some books. I created a Calibre plugin that works for the majority of my books, but recently, some of them aren't importing with stripped DRM. When I run the scripts in Terminal, I get the "no key found. maybe the PID is incorrect" error. And this happens with every version of MobiDeDRM I have. I think I've tried just about every patch suggestion out there. I don't know what else to do. What would make it work with some books and not others?
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