Copyright © 1990-1994 The Regents of the University of California
Copyright © 1994 The Australian National University
Copyright © 1994-1997 Sun Microsystems, Inc
Copyright © 1995-1997 Roger E. Critchlow Jr
Copyright © 1997-2000 Scriptics Corporation
Copyright © 1998-2000 Ajuba Solutions
Copyright © 2000 Jeffrey Hobbs
Copyright © 2001-2011 Donal K. Fellows
Copyright © 2003 ActiveState Corporation
Copyright © 2004-2006 Joe English
Copyright © 2006-2007 Daniel A. Steffen <das(at)users.sourceforge.net>
Copyright © 2008 Pat Thoyts
Copyright © 2011 Kevin Walzer