From SPHYSICS

GPL LICENSE INFO

The source code for SPHYSICS is freely redistributable under the terms of the GNU General Public License (GPL) as published by the Free Software Foundation.

Simply put, the GPL says that anyone who redistributes the software, with or without changes, must pass along the freedom to further copy and change it. By distributing the complete source code for GNU SPHYSICS under the terms of the GPL, we guarantee that you and all other users will have the freedom to redistribute and change SPHYSICS.

Releasing the source code for SPHYSICS has another benefit as well. By having access to all of the source code for a mathematical system like SPHYSICS, you have the ability to see exactly how each and every computation is performed.

Although enhancements to SPHYSICS are not required to be redistributed under the terms of the GPL, we encourage you to release your enhancements to SPHYSICS under the same terms for the benefit of all users. We also encourage you to submit your changes for inclusion in future versions of SPHYSICS.

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