I bought a book from Amazon yesterday, wondering whether I'd have a problem or not, but it was fine. So today I bought another, but I couldn't convert it because of DRM. I don't understand why. Unfortunately both books are only available on Amazon, otherwise I would have bought them elsewhere.
If I understand the thread, I'll have to go back to the 4.23 version of Calibre - with no enthusiasm whatever. My present version is the portable 5.3 version and the most recent version of the usual plugins.
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