[TimW]

Originally Posted by Mike L

I've just read the "terms of service", both for the US and the UK. I can't see any restrictions on de-registering and re-registering.

See http://www.amazon.com/gp/help/custom...deId=200506200

Appendix B (product information) of the Kindle User Guide, p. 112:

"Limitations. Unless specifically indicated otherwise, you may not sell, rent, lease, distribute, broadcast, sublicense, or otherwise assign any rights to the Digital Content or any portion of it to any third party, and you may not remove or modify any proprietary notices or labels on the Digital Content. In addition, you may not bypass, modify, defeat, or circumvent security
features that protect the Digital Content."