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doc/LICENSE.txt

 Gmsh is provided under the terms of the GNU General Public License
 (GPL), Version 2 or later, with the following exception:
 
- The copyright holders of Gmsh give you permission to combine Gmsh
- with code included in the standard release of TetGen (from Hang Si),
- Netgen (from Joachim Sch"oberl), Chaco (from Bruce Hendrickson and
- Robert Leland at Sandia National Laboratories), METIS (from
- George Karypis at the University of Minnesota) and OpenCASCADE (from 
- Open CASCADE S.A.S) under their respective licenses. You may copy 
- and distribute such a system following the terms of the GNU GPL 
- for Gmsh and the licenses of the other code concerned, provided 
- that you include the source code of that other code when and as the 
- GNU GPL requires distribution of source code.
-
- Note that people who make modified versions of Gmsh are not
- obligated to grant this special exception for their modified
- versions; it is their choice whether to do so. The GNU General
- Public License gives permission to release a modified version
- without this exception; this exception also makes it possible to
- release a modified version which carries forward this exception.
+  The copyright holders of Gmsh give you permission to combine Gmsh
+  with code included in the standard release of TetGen (from Hang Si),
+  Netgen (from Joachim Sch"oberl), Chaco (from Bruce Hendrickson and
+  Robert Leland at Sandia National Laboratories), METIS (from
+  George Karypis at the University of Minnesota) and OpenCASCADE (from 
+  Open CASCADE S.A.S) under their respective licenses. You may copy 
+  and distribute such a system following the terms of the GNU GPL 
+  for Gmsh and the licenses of the other code concerned, provided 
+  that you include the source code of that other code when and as the 
+  GNU GPL requires distribution of source code.
+
+  Note that people who make modified versions of Gmsh are not
+  obligated to grant this special exception for their modified
+  versions; it is their choice whether to do so. The GNU General
+  Public License gives permission to release a modified version
+  without this exception; this exception also makes it possible to
+  release a modified version which carries forward this exception.
 
 End of exception.