Appendix 9: GNU Free Documentation License

What follows is the verbatim text of the GNU Free Documentation Li 

cense. This is the license under which this book has been released.

GNU Free Documentation License

Version 1.1, March 2000

Copyright c

  2000 Free Software Foundation, Inc.

59 Temple Place, Suite 330, Boston, MA 02111 1307 USA

Everyone is permitted to copy and distribute verbatim copies of this license

document, but changing it is not allowed.

Preamble

The purpose of this License is to make a manual, textbook, or other written

document  free  in the sense of freedom: to assure everyone the effective free 

dom to copy and redistribute it, with or without modifying it, either commer 

cially or noncommercially. Secondarily, this License preserves for the author

and publisher a way to get credit for their work, while not being considered

responsible for modifications made by others.

This License is a kind of  copyleft , which means that derivative works of the

document must themselves be free in the same sense. It complements the GNU

General Public License, which is a copyleft license designed for free software.

We have designed this License in order to use it for manuals for free software,

because free software needs free documentation: a free program should come

with manuals providing the same freedoms that the software does. But this

License is not limited to software manuals; it can be used for any textual work,

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