I bought a Kindle Fire as a gift for my son from Amazon and we had to deregister the Fire from my Amazon account and register it to his. Obviously this won't apply if you buy it from say Best Buy. Here's some info:
http://www.amazon.com/gp/help/custom...50#registering
http://www.amazon.com/forum/kindle?_...x2YMWVZDJ37GVU
I would contact Amazon Customer Service and ask the question.
https://www.amazon.com/gp/help/conta...node_id=508510