This program is free software; you may redistribute it and/or modify it under the conditions of the LaTeX Project Public License, either version 1.2 or (at your option) any later version. The latest version of this license is in http://www.latex-project.org/lppl.txt, and version 1.2 or later is part of all distributions of LaTeX version 1999/12/01 or later. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the LaTeX Project Public License for more details.