The Boehm-Demers-Weiser Conservative Garbage Collector
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Most files in this distribution carry the following copyright and license:

  Copyright (c) 1988, 1989 Hans-J. Boehm, Alan J. Demers
  Copyright (c) 1991-1996 by Xerox Corporation.  All rights reserved.
  Copyright (c) 1996-1999 by Silicon Graphics.  All rights reserved.
  Copyright (c) 1999-2011 by Hewlett-Packard Development Company.
  All rights reserved.
  Copyright (c) 2008-2021 Ivan Maidanski

Some files are also

  Copyright (c) 1998 by Fergus Henderson.  All rights reserved.

The file include/gc.h is also

  Copyright (C) 2007 Free Software Foundation, Inc

  THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
  OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.

  Permission is hereby granted to use or copy this program
  for any purpose,  provided the above notices are retained on all copies.
  Permission to modify the code and to distribute modified code is granted,
  provided the above notices are retained, and a notice that the code was
  modified is included with the above copyright notice.

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The file include/gc_allocator.h carries the following two licenses:

  Copyright (c) 1996-1997
  Silicon Graphics Computer Systems, Inc.

  Permission to use, copy, modify, distribute and sell this software
  and its documentation for any purpose is hereby granted without fee,
  provided that the above copyright notice appear in all copies and
  that both that copyright notice and this permission notice appear
  in supporting documentation.  Silicon Graphics makes no
  representations about the suitability of this software for any
  purpose.  It is provided "as is" without express or implied warranty.

  Copyright (c) 2002
  Hewlett-Packard Company

  Permission to use, copy, modify, distribute and sell this software
  and its documentation for any purpose is hereby granted without fee,
  provided that the above copyright notice appear in all copies and
  that both that copyright notice and this permission notice appear
  in supporting documentation.  Hewlett-Packard Company makes no
  representations about the suitability of this software for any
  purpose.  It is provided "as is" without express or implied warranty.

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The files extra/msvc_dbg.c and include/private/msvc_dbg.h carry the
following MIT license:

  Copyright (c) 2004-2005 Andrei Polushin

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.