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I think I've got half an answer. I've never been able to get Calibre to directly un-DRM books. What I do is to download a text from Google books using the 'ordinary' software, in my case a Sony Reader for PC. I then transfer the text into my ebook (a Sony Reader), and then transfer it from the ebook into Calibre. I guess that this final version is DRM-free, but no doubt some of you will then tell me if I'm wrong.
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