I'd like to add a package for spin to the tree (it's used at several universities, including mine and Caltech). However, it's not straightforward. The basic license is for educational purposes only. Here are my suggestions how to implement that. /usr/portage/licenses/spin-educational with the following content: Copyright (c) 1989-2006 Lucent Technologies, Bell Labs Extensions (c) 2006-2009 NASA/JPL California Institute of Technology All Rights Reserved. For educational purposes only. No guarantee whatsoever is expressed or implied by the distribution of this code. /usr/portage/licenses/spin-commercial with the content pasted from http://www.spinroot.com/spin/spin_license.html And then in the ebuild: LICENSE="|| ( spin-educational spin-commercial )" Are there any license groups these should be added to?