Quote:
Originally Posted by plib
Do you happen to know what the UUID is tied to? Book, machine, user? Would the same book in different libraries on a network have the same or different UUIDs?
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Looking at the code ...
The UUID is assigned when a book is added to a library (when a new row is added to calibre's database). It is preserved when a book is moved to another library (copy with delete), but regenerated when a book is copied to another library.
Note that the UUID inside the book (e.g., in the OPF inside an ePub) is not changed when a book is added to a library. The value is changed to the value in calibre's database in the resulting copy when the book is converted, assuming that the target format contains a UUID.