Please see the license directory in the Xholon distribution for copies of the Xholon and third-party licenses.
Xholon is licensed under the terms of the GNU Lesser General Public License (LGPL). Individual source files specify the license. Refer to the full LGPL for details of the Xholon license. Xholon is: Copyright (C) 2005, 2006, 2007 Ken Webb
For information on third party licenses, see the README.txt file that is included with the Xholon downloads.