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personally I purchase from 4 or 5 sources, and I too use Calibre to sync all books to my various devices. I do not use any other source to load my devices. Although I keep copies of all of my original files from the various sources, it is only the Calibre created books which I keep on my devices. I was never one that was big on dedrming books but after loosing access to books from sources that no longer offer mobi support, I have adopted the practice to ensure I always have access to my books in the future when I upgrade my devices.
Nyn
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