Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
As open source software, VTK is free to use for any purpose. Technically, VTK has a BSD-style license, which imposes minimal restrictions for both open and closed source applications. For statistics on VTK, please refer to its Open Hub page.
Berkeley Software Distribution (BSD) GNU General Public License (GPL) GNU Lesser General Public License (LGPL) 外部リンク. The BSD License - Open Source Initiative (OSI) 3条項BSDライセンス（オープンソースグループ・ジャパンによる邦訳）
BSD/386 1.0 was released in March 1993. The company sold licenses and support for it, taking advantage of terms in the BSD License which permitted use of the BSD software in proprietary systems, as long as credit was given to the author. The company in turn contributed code and resources to the development of non-proprietary BSD operating systems.
But since BSD contained code from AT&T Unix, all recipients had to first get a license from AT&T in order to use BSD.  In June 1989, "Networking Release 1" or simply Net-1 – the first public version of BSD – was released.
If you are already licensed, have applied for a license, are about to apply for a license, or are renewing your license from the Board of Medical Examiners: Professional Licensing Customer Service: (406) 444-6880 DLIBSDHELP@MT.GOV. If you have scope of practice questions or comments for the Board of Medical Examiners.