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I want to keep a book on only one device at a time, I actually want to make sure don't put it on more than one device.
As I first set it up, I need it to check what book is on what device, later on I need it to update the device in cases where I acquired the book with Calibre and then moved it to a device, but I also need the device to move a book to Calibre and update what device it is on in cases where I've acquired books with the device.
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