Copyright (C) 2009-2019, Kaz Kylheku . All rights reserved. The document named LICENSE specifies the license for the TXR program, including the library modules which it it uses, most of which are likewise BSD licensed. The MPI library, found in the mpi/ subdirectory, was developed over the yeras 1998-2006 by Michael J. Fromberger. Its license consists of the mpi/README file, which states: This software is in the public domain. It is entirely free, and you may use it and/or redistribute it for whatever purpose you choose; however, as free software, it is provided without warranty of any kind, not even the implied warranty of merchantability or fitness for a particular purpose. Whether or not software can be explicitly deposited into the public domain is controversial, so the MPI library may have to be regarded as being copyrighted by Michael J. Fromberger. The above text can be reasonably understood to constitute a license grant which is compatible with TXR's Two-Clause BSD license in the sense that it is at least as permissive. The RSA-derived MD5 digest routines are used in in accordance with the permission granted by a February 23, 2000 memo from John Linn to the IETF. License-like wording from this memo has been placed by the TXR project into block comments of the md5.c and md5.h files. The permission is compatible with the BSD license, as it allows unfettered redistribution and use, without any advertizing clauses. TXR is ported to Windows with the help of a derivative of the Cygwin library. For user convenience, a packaged version of TXR includes the CYGWIN1.DLL, in accordance with the terms of Cygwin's license, the GNU Lesser Public License, Version 3. More details are in the document LICENSE-CYG, which is incorporated into the Windows installer and displayed to users during installation to inform them of the dependency on a LGPL-ed library.