None of the KDE packages (kdebase, kdenetwork, etc) have LICENSE variables in their ebuilds.
kde-dist.eclass sets LICENSE var. marking as invalid. python -c "import portage; print portage.portdb.aux_get('kde-base/kdebase-3.1.1',['LICENSE'])" returns GPL-2
Luke, Did you get a similar error to what is described here: http://forums.gentoo.org/viewtopic-t-339879.html ?