girdap is made available under GNU general public license that allows any use of the source code without any obligation.

GNU General Public License allows you to use, redistribute and/or modify the code as you wish; provided that you must pass on to the recipients the same freedoms you received; namely the source code.

Following is the statement that comes along with the source code.

Copyright (C) 2015, Eray Uzgoren

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 3 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, see http://www.gnu.org/licenses/.