ParaView uses a permissive BSD license that enables the broadest possible audience, including commercial organizations, to use the software, royalty free, for most purposes. In addition, there are other licenses that are applicable because of other packages leveraged by ParaView or developed by collaborators. Lastly, there are specific packages for the ParaView binaries available on paraview.org that have applicable licenses.
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Under the terms of Contract DE-NA0003525 with NTESS, the U.S. Government retains certain rights in this software: Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of Kitware nor the names of any contributors may be used to endorse or promote products derived from this software without specific prior written permission.