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Information provided in this home page comply with the following General Public License, Version 1, February 1989, by The Free Software Foundation, Inc, (675 Mass Ave, Cambridge, MA 02139, USA), which is generally known as copyleft.

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GNU General Public License 
Terms And Conditions for Copying, Distribution and Modification

  0. This License Agreement applies to any program or other work which
     contains a notice placed by the copyright holder saying it may be
     distributed under the terms of this General Public License. The
     ``Program'', below, refers to any such program or work, and a ``work
     based on the Program'' means either the Program or any work containing
     the Program or a portion of it, either verbatim or with modifications.
     Each licensee is addressed as ``you''.
  1. You may copy and distribute verbatim copies of the Program's source
     code as you receive it, in any medium, provided that you conspicuously
     and appropriately publish on each copy an appropriate copyright notice
     and disclaimer of warranty; keep intact all the notices that refer to
     this General Public License and to the absence of any warranty; and
     give any other recipients of the Program a copy of this General Public
     License along with the Program. You may charge a fee for the physical
     act of transferring a copy.
  2. You may modify your copy or copies of the Program or any portion of it,
     and copy and distribute such modifications under the terms of Paragraph
     1 above, provided that you also do the following:
        a) cause the modified files to carry prominent notices stating that
          you changed the files and the date of any change; and
        b) cause the whole of any work that you distribute or publish, that
          in whole or in part contains the Program or any part thereof,
          either with or without modifications, to be licensed at no charge
          to all third parties under the terms of this General Public
          License (except that you may choose to grant warranty protection
          to some or all third parties, at your option).
        c) If the modified program normally reads commands interactively when
          run, you must cause it, when started running for such interactive
          use in the simplest and most usual way, to print or display an
          announcement including an appropriate copyright notice and a
          notice that there is no warranty (or else, saying that you provide
          a warranty) and that users may redistribute the program under
          these conditions, and telling the user how to view a copy of this
          General Public License.
        d) You may charge a fee for the physical act of transferring a copy,
          and you may at your option offer warranty protection in exchange
          for a fee.
      Mere aggregation of another independent work with the Program (or
      its derivative) on a volume of a storage or distribution medium
      does not bring the other work under the scope of these terms.
   3. You may copy and distribute the Program (or a portion or derivative of
     it, under Paragraph 2) in object code or executable form under the
     terms of Paragraphs 1 and 2 above provided that you also do one of the
     following:
        a) accompany it with the complete corresponding machine-readable
          source code, which must be distributed under the terms of
          Paragraphs 1 and 2 above; or,
        b) accompany it with a written offer, valid for at least three years,
          to give any third party free (except for a nominal charge for the
          cost of distribution) a complete machine-readable copy of the
          corresponding source code, to be distributed under the terms of
          Paragraphs 1 and 2 above; or,
        c) accompany it with the information you received as to where the
          corresponding source code may be obtained. (This alternative is
          allowed only for noncommercial distribution and only if you
          received the program in object code or executable form alone.)
      Source code for a work means the preferred form of the work for
      making modifications to it. For an executable file, complete
      source code means all the source code for all modules it contains;
      but, as a special exception, it need not include source code for
      modules which are standard libraries that accompany the operating
      system on which the executable file runs, or for standard header
      files or definitions files that accompany that operating system.
  4. You may not copy, modify, sublicense, distribute or transfer the
     Program except as expressly provided under this General Public License.
     Any attempt otherwise to copy, modify, sublicense, distribute or
     transfer the Program is void, and will automatically terminate your
     rights to use the Program under this License. However, parties who have
     received copies, or rights to use copies, from you under this General
     Public License will not have their licenses terminated so long as such
     parties remain in full compliance.
  5. By copying, distributing or modifying the Program (or any work based on
     the Program) you indicate your acceptance of this license to do so, and
     all its terms and conditions.
  6. Each time you redistribute the Program (or any work based on the
     Program), the recipient automatically receives a license from the
     original licensor to copy, distribute or modify the Program subject to
     these terms and conditions. You may not impose any further restrictions
     on the recipients' exercise of the rights granted herein.
  7. The Free Software Foundation may publish revised and/or new versions of
     the General Public License from time to time. Such new versions will be
     similar in spirit to the present version, but may differ in detail to
     address new problems or concerns. 

     Each version is given a distinguishing version number. 
     If the Program specifies a version number of the license which applies to it 
     and ``any later version'', you have the option of following the terms and conditions 
     either of that version or of any later version published by the Free Software
     Foundation. If the Program does not specify a version number of the
     license, you may choose any version ever published by the Free Software
     Foundation.
  8. If you wish to incorporate parts of the Program into other free
     programs whose distribution conditions are different, write to the
     author to ask for permission. For software which is copyrighted by the
     Free Software Foundation, write to the Free Software Foundation; we
     sometimes make exceptions for this. Our decision will be guided by the
     two goals of preserving the free status of all derivatives of our free
     software and of promoting the sharing and reuse of software generally.
 
                  NO WARRANTY

   9. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
      WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE
      LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS
      AND/OR OTHER PARTIES PROVIDE THE PROGRAM ``AS IS'' WITHOUT
      WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT
      NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
      FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE
      QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
      PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY
      SERVICING, REPAIR OR CORRECTION.

   10. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
      WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY
      MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE
      LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
      INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
      INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
      DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU
      OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY
      OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN
      ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

- Learning GNU Emacs by Debra Cameron and Bill Rosenblatt
pp. 357-360, O'Reilly & Associates, Inc. 1991 -