Specifications

F. Gnu Free Documentation License

Version 1.2, November 2002

02111−1307 USA Everyone is permitted to copy and distribute verbatim copies of this license document but

changing it is not allowed.

0. PREAMBLE

The purpose of this License is to make a manual, textbook, or other functional and useful document "free" in

the sense of freedom: to assure everyone the effective freedom to copy and redistribute it, with or without

modifying it, either commercially 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 cense 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, regardless of

subject matter or whether it is published as a printed book. We recommend this License principally for works

in which its purpose is instruction or reference.

1. APPLICABILITY AND DEFINITIONS

This License applies to any manual or other work, in any medium, that contains a notice placed by the

world−wide, royalty−free license, unlimited in duration, to use that work under the conditions stated herein.

The "Document", below, refers to any such manual or work. Any member of the public is a licensee and is

addressed as "you". You accept the license if you copy, modify, or distribute the work in a way, thus requiring

permission under copyright law.

A "Modified Version" of the Document means any work containing the Document or a portion of it, either

copied verbatim, or with modifications and/or translated into another language.

A "Secondary Section" is a named appendix or a front−matter section of the Document that deals exclusively

with the relationship of the publishers or authors of the Document to the Document's overall subject (or to

related matters) and contains nothing that could fall directly within that overall subject. (Thus, if the

Document is in part a textbook of mathematics, a Secondary Section may not explain any mathematics.) The

relationship could be a matter of historical connection with the subject or with related matters, or of legal,

commercial, philosophical, ethical, or political position regarding them.

The "Invariant Sections" are certain Secondary Sections in which titles are designated, as being those of

Invariant Sections, in the notice that says that the Document is released under this License. If a section does

not fit the above definition of Secondary, then it is not allowed to be designated as Invariant. The Document

may contain zero Invariant Sections. If the Document does not identify any Invariant Sections, then there are

none.

F. Gnu Free Documentation License 43