Copyright and Disclaimer

VMD is Copyright © 1995-2001 Theoretical Biophysics Group and the Board of Trustees of the University of Illinois

Portions of this code are copyright © 1997-1998 Andrew Dalke.

The terms for using, copying, modifying, and distributing VMD are specified by the VMD License. The license agreement is distributed with VMD in the file LICENSE. If for any reason you do not have this file in your distribution, it can be downloaded from:
http://www.ks.uiuc.edu/Research/vmd/current/LICENSE.html
Some of the code and executables used by VMD have their own usage restrictions:

• STRIDE
  STRIDE, the program used for secondary structure calculation, is free to both academic and commercial sites provided that STRIDE will not be a part of a package sold for money. The use of STRIDE in commercial packages is not allowed without a prior written commercial license agreement. See http://www.embl-heidelberg.de/argos/stride/stride_info.html

• SURF
  The source code for SURF is copyrighted by the original author, Amitabh Varshney, and the University of North Carolina at Chapel Hill. Permission to use, copy, modify, and distribute this software and its documentation for educational, research, and non-profit purposes is hereby granted, provided this notice, all the source files, and the name(s) of the original author(s) appear in all such copies.
  BECAUSE THE CODE IS PROVIDED FREE OF CHARGE, IT IS PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED.
  This software was developed and is made available for public use with the support of the National Institutes of Health, National Center for Research Resources under grant RR02170.
  See ftp://ftp.cs.unc.edu/pub/projects/GRIP/SURF/surf.tar.Z

• url_get
  The Perl script url_get, was written by Jack Lund at the University of Texas as Austin. There appear to be no restrictions on its use.

• Python
  Python is made available subject to the terms and conditions in CNRI's License Agreement. This Agreement together with Python may be located on the Internet using the following unique, persistent identifier (known as a handle): 1895.22/1012. This Agreement may also be obtained from a proxy server on the Internet using the following URL: http://hdl.handle.net/1895.22/1012

• PCRE
  The Perl Compatible Regular Expressions (PCRE) library used in VMD was written by Philip Hazel and is Copyright (c) 1997-1999 University of Cambridge.
  Permission is granted to anyone to use this software for any purpose on any computer system, and to redistribute it freely, subject to the following restrictions:
  1. This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  2. The origin of this software must not be misrepresented, either by explicit claim or by omission.
  3. Altered versions must be plainly marked as such, and must not be misrepresented as being the original software.
  4. If PCRE is embedded in any software that is released under the GNU General Purpose Licence (GPL), then the terms of that licence shall supersede any condition above with which it is incompatible.

• Tachyon
  The Tachyon ray tracing system distributed with VMD was written by John E. Stone and is Copyright (c) 1994-2001 by John E. Stone. Please see the current distribution of Tachyon for redistribution and or licensing information outside of VMD use. Permission is granted to use Tachyon freely along with VMD.