I just played around a bit with Descent 2. I'm a bit curious that in Portage, the package ist described as standing under the GPL v2. This seems to be incorrect, as http://www.descent2.com/ddn/sources/descent2/ shows. Also, the readme.txt from the package distributed by http://icculus.org/d2x/ claims that this is a proprietary license. Shouldn't the license note in the ebuild be changed? Other packages might also be affected.
Perhaps it should be similar to /usr/portage/licenses/D1X D2X offshoots are still in active development: http://forums.gentoo.org/viewtopic-p-2954426.html
indeed. fixed in cvs.