!. It depends on the Adobe ID you first opened the book with -- that is the Adobe ID that the book belongs to.
2. No, only one ID at a time. However, you can deregister and reregister whenever you want.
3. Yes, after downloading the book to ADE or any other logged-in pc/device, you can register more pcs/devices and the book will open on the newly-registered pc/device.
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