References and LICENSES
When using the APBS, you are "obligated" to register your use of the software. This will the authors able to require funding for further development.
Register here, it takes 1 minutes: http://www.poissonboltzmann.org/apbs/downloads
GNU General Public License: http://www.gnu.org/copyleft/gpl.html
This version of MALOC is distributed under the following guidelines: MALOC (Minimal Abstraction Layer for Object-oriented C) Copyright (C) 1994-2010 Michael Holst This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.