"""
 BASEmesh: a QGIS plugin for the creation of computational meshes
 for the numerical modelling software BASEMENT using Jonathan Shewchuk's mesh
 generator 'Triangle'.

 Copyright (C) 2013 Florian Hinkelammert and Christian Volz, ETH Zurich
 hinkelammert@vaw.baug.ethz.ch / volz@vaw.baug.ethz.ch

 This QGIS Plugin 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 For the mesh generator Triangle, the licence regulations are not obvious. It's
 author Jonathan Shevchuk has the copyright on the software and want's to be
 informed if the software is used. For more information, visit
 http://www.cs.cmu.edu/~quake/triangle.html.
"""

'Triangle' is the heart of the triangulation process in the present plugin. Unfortunately, it's author Jonathan Richard Shewchuk doesn't use a common licence agreement.

Therefore, here is the text stated on Triangle's homepage (http://www.cs.cmu.edu/~quake/triangle.html) concerning the usage of Triangle:

'A brief plea

If you use Triangle, and especially if you use it to accomplish real work, I would like very much to hear from you. A short letter or email (to jrs@cs.berkeley.edu) describing how you use Triangle will mean a lot to me. The more people I know are using this program, the more easily I can justify spending time on improvements that I hope will benefit you.

...

If you use a mesh generated by Triangle in a publication, please include an acknowledgment as well. And please spell Triangle with a capital ``T''! If you want to include a paper citation, I suggest choosing one of the two atop the Research Credit page (http://www.cs.cmu.edu/~quake/triangle.research.html).'