Nelson license:
Nelson is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License, version 3.0
It is still also available under the terms of the GNU General Public License (GPL) v3.0.
Nelson is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with Nelson. If not, see http://www.gnu.org/licenses/.