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A while back I could only deDRM in very small batches and Calibre required a fresh start. If it had been open for a while it would fail with even a single book for me. I'm not sure in which version this was fixed, because I made sure it was a fresh instance of the programand only added a couple of books at a time all the time. It wasn't until I got a new computer and was setting up Calibre that I forgot the previous limitations I'd place on the program and it worked with no problem.
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