Ahh. Now I understand. As kennyc said, you can copy the library to as many other computers as you want.
You could also install the library on an external usb key or hard drive. That external drive can then be taken from computer to computer. If you want to send it to your sons, they can install Calibre and access the books as well (respecting copyright laws of course).
The advantage to this method is changes or updates are kept with the books on the external drive. Also, you can copy the data to a second external drive to act as a backup.
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