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Originally Posted by whitearrow
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There's no way to distinguish these from books with DRM other than opening them in Mobipocket Reader or Calibre (if you don't have the de-DRM plugins enabled).
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Therein lies the rub. I have ebooks from a number of sources and as soon as I import them to calibre, I have drm-free books. But I don't know what books have DRM originally and which ones don't unless I look at the file size and compare (I keep the original files).