2. Licence

      Permission is granted to copy, distribute and/or modify this
      document under the terms of the GNU Free Documentation License,
      Version 1.2 or any later version published by the Free Software
      Foundation; with no Invariant Sections, no Front-Cover Texts and
      no Back-Cover Texts.  A copy of the license is included in the
      section entitled "GNU Free Documentation License".

GNU Free Documentation License