I've done a bit of research on licenses that would allow public redistribution while still allowing a degree of control over use for FIRST.
Apple Common Documentation License (CDL):
http://www.opensource.apple.com/cdl/
This is "a very simple and consistent license that allows relatively unrestricted use and redistribution of documents while still maintaining the author's credit and intent." It doesn't specify how the original author is to be given credit, as long as it is given (which shouldn't be a problem with FIRST, because it has copyrights and/or logos all over the place; also, teams want to associate themselves with FIRST)
OpenContent License (OPL):
http://opencontent.org/opl.shtml
"This document outlines the principles underlying the OpenContent (OC) movement and may be redistributed provided it remains unaltered. For legal purposes, this document is the license under which OpenContent is made available for use." This seems (and I've only read what I copied here) to be pretty good (if not perfect) for FIRST.
Creative Commons Attribution-Noncommercial-No Derivative Works 3.0:
http://creativecommons.org/licenses/by-nc-nd/3.0/
http://creativecommons.org/licenses/.../3.0/legalcode
"This license is the most restrictive of our six main licenses, allowing redistribution. This license is often called the “free advertising” license because it allows others to download your works and share them with others as long as they mention you and link back to you, but they can’t change them in any way or use them commercially." Again, this seems pretty good for FIRST, if it's not perfect. Note, I only read the human-readable version (the first link), so there may be some legalese that FIRST doesn't like, but it seems good.
Note, I'm definitely not a lawyer, and don't intend to become one; I'm just looking at the overviews and suggesting them for consideration and further examination by properly trained people.
Respectfully,
-Jake Alexander