The GPL

Proview is licensed under the GPLv2 with an exception

.

* Proview   Open Source Process Control.
* Copyright (C) 2005-2012 SSAB EMEA AB.
*
* This file is part of Proview.
*
* 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 Proview. If not, see <http://www.gnu.org/licenses/>
*
* Linking Proview statically or dynamically with other modules is
* making a combined work based on Proview. Thus, the terms and 
* conditions of the GNU General Public License cover the whole 
* combination.
*
* In addition, as a special exception, the copyright holders of
* Proview give you permission to, from the build function in the
* Proview Configurator, combine Proview with modules generated by the
* Proview PLC Editor to a PLC program, regardless of the license
* terms of these modules. You may copy and distribute the resulting
* combined work under the terms of your choice, provided that every 
* copy of the combined work is accompanied by a complete copy of 
* the source code of Proview (the version used to produce the 
* combined work), being distributed under the terms of the GNU 
* General Public License plus this exception.