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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ParaView offers the possibility to extend its functionality in several directions. This encompasses modifications to the GUI, implementation of new sources (i.e. generation of predefined curves and bodies), definition of new selection functions etc. The most useful category of plugins are the Filters.