Contract
From AmtWiki
What is it?
A signed and notarized contract between Kingdom of [Burning Lands] and a Chapter. According to the information at http://www.amtgardinc.com
"It allows a group to call themselves "Amtgard." It sets the date of a land, and it gives permission to create copies of the Amtgard [Rules of Play|Rulebook] and Amtgard [Corpora] for their members."
An FAQ is available at http://www.amtgardinc.com/blpages/faqs.html