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The igatools library has been placed under an Open Source license, in the sense advocated by the Open Source Initiative. You are thus free to copy and use it, and you have free access to all source code.
However, igatools is not in the public domain, it is property of and copyrighted by the igatools authors, and there are restrictions on its use: The legally binding license is the GNU General Public License (GPL) as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
In this document, as well as in the program files, the term igatools authors refer to all people mentioned at the igatools authors page.