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I don't think you need to worry about "book source". Marvin works with DRM-free books and does not keep track of where you or anyone got a book from. It just needs to be the exact same EPUB file for annotations sharing to work properly. That really should work without any issues.
My suggestion: when you share your annotations with a friend, also email him/her the book file itself. Then, if your friend loads your book file and your annotations file, they should see the exact same thing in their Marvin as you do.
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