License

Optilux is released under the GNU General Public License, version 3. A FAQ list about GPL can be found at the GNU website. The GPLv3 gives you the freedom to distribute a copy of your files if you wish to. However, it also gives you the freedom to:

• make modifications to the files and use them privately (#GPLRequireSourcePostedPublic)
• develop a modified version under a nondisclosure agreement (#DevelopChangesUnderNDA).

However, if you release the modified version to the public in some way, the GPLv3 requires you to make the modified source code available to the program's users. Each m-file of Optilux contains the following body of the license:

%    This file is part of Optilux, the optical simulator toolbox.
%    Copyright (C) 2021  Paolo Serena,< serena@tlc.unipr.it >
%
%    Optilux 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 3 of the License, or
%    (at your option) any later version.
%
%    Optilux 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, see < http://www.gnu.org/licenses/ >.