License
Racket software and documentation is distributed under the GNU Lesser General Public License (LGPL). This means
- You can link Racket software into proprietary applications, provided you follow the specific rules stated in the LGPL. 
- You can modify Racket software. If you distribute a modified version, you must distribute it under the terms of the LGPL, which in particular means that you must release the source code for the modified software. 
See "COPYING_LESSER.txt" in your Racket installation’s "lib" directory for more information.
| Racket | 
| Copyright (c) 2010-2015 PLT Design Inc. | 
Racket software includes or extends the following copyrighted material:
| libscheme | 
| Copyright (c) 1994 Brent Benson | 
| All rights reserved. | 
| Conservative garbage collector | 
| Copyright (c) 1988, 1989 Hans-J. Boehm, Alan J. Demers | 
| Copyright (c) 1991-1996 Xerox Corporation | 
| Copyright (c) 1996-1999 Silicon Graphics | 
| Copyright (c) 1999-2005 Hewlett-Packard Development Company, L.P. | 
| All rights reserved. | 
| Collector C++ extension by Jesse Hull and John Ellis | 
| Copyright (c) 1994 Xerox Corporation | 
| All rights reserved. | 
| GNU MP Library | 
| Copyright (c) 1991, 1992, 1993, 1994, 1996, 1999, 2000, 2007 | 
| Free Software Foundation, Inc. | 
| GNU lightning | 
| Copyright (c) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2011 | 
| Free Software Foundation, Inc. | 
| libunwind | 
| Copyright (c) 2003-2005 Hewlett-Packard Development Company, L.P. | 
See also other "LICENSE.txt" files in your distribution or packages.