PLT Software
Copyright (c) 1995-98 PLT, Rice University

PLT software is distributed under the GNU Library General Public
License (LGPL).  This means you can link PLT software (such as
MzScheme or MrEd) into proprietary applications, provided you follow
the specific rules stated in the LGPL.  You can also modify PLT
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
notes/COPYING.LIB for more information.

PLT software is based on:

  wxWindows
  Copyright (c) 1994 Artificial Intelligence Applications Institute,
                     The University of Edinburgh
  All rights reserved.

and/or

  wxWindows Xt
  Copyright (c) 1994 Artificial Intelligence Applications Institute,
                     The University of Edinburgh
  Copyright (c) 1995 GNU (Markus Holzem)
  All rights reserved.

  Therefore, the non-Motif X Windows version of DrScheme.MrEd is under
  the GNU General Public License.

and

  libscheme
  Copyright (c) 1994 Brent Benson
  All rights reserved.

and

  Conservative garbage collector
  Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
  Copyright (c) 1991-1996 by Xerox Corporation.  
  Copyright (c) 1996 by Silicon Graphics.  All rights reserved.
  All rights reserved.

  C++ extension by Jesse Hull and John Ellis
  Copyright (c) 1994 by Xerox Corporation.  
  All rights reserved.

