Originally Posted by HarryT
You can deregister it and re-register it to a different account as often as you wish. A friend of mine does so often, when he wants to read a book from his wife's Amazon account.
That's my point exactly. The OP was asking how to de-register in order to register to an different account. My response was to the poster above saying you could register without
de-registering it, which I don't think is possible. I could be wrong though.