Math-PlanePath is Copyright 2010, 2011, 2012, 2013, 2014, 2015, 2016 Kevin Ryde
Math-PlanePath is licensed under the GNU General Public License GPL
version 3 or at your option any later version.  The complete text of
GPL version 3 is in the file
    /usr/share/common-licenses/GPL-3
The program home page is
    http://user42.tuxfamily.org/math-planepath/index.html