: I honestly don't know, but I suspect there are others who can answer, since
: there are Aleph One team members who post here.
The trilogy release "license": http://trilogyrelease.bungie.org/faq.html
Contents of INFINITY_CONTENT_LICENSE.txt that Bungie released with the Infinity source code:
This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to Creative Commons, 444 Castro Street, Suite 900, Mountain View, California, 94041, USA.