XPDOM Library and Components are Open Source and are covered with GNU General Public License (GPL) v2 as defined by the GNU Organization

Can be distributed and used freely in Web sites with non commercial purposes

To use in commercial Web sites or to be used with commercial packages is needed an authorization or commercial license of the author

XPDOM Library and Components are copyrighted of José María Arranz Santamaría, years 2000-2002