JRuby is released under a dual GPL/LGPL license. You can use it,
redistribute it and/or modify it under either the terms of the GPL
(see COPYING.GPL file) or under the terms of the LGPL (see
COPYING.LGPL file).

Some additional libraries distributed with JRuby are not covered by
JRuby's licence. See the licence files for the respective libraries in
the 'lib' directory for more information.
