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18\chapter{GNU Free Documentation License}
19\index[general]{GNU ree Documentation License}
20\index[general]{License!GNU ree Documentation}
21\addcontentsline{toc}{section}{GNU ree Documentation License}
22
23%\label{label_fdl}
24
25 \begin{center}
26
27       Version 1.2, November 2002
28
29
30 Copyright \copyright 2000,2001,2002  Free Software Foundation, Inc.
31
32 \bigskip
33
34     51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
35
36 \bigskip
37
38 Everyone is permitted to copy and distribute verbatim copies
39 of this license document, but changing it is not allowed.
40\end{center}
41
42
43\begin{center}
44{\bf\large Preamble}
45\end{center}
46
47The purpose of this License is to make a manual, textbook, or other
48functional and useful document "free" in the sense of freedom: to
49assure everyone the effective freedom to copy and redistribute it,
50with or without modifying it, either commercially or noncommercially.
51Secondarily, this License preserves for the author and publisher a way
52to get credit for their work, while not being considered responsible
53for modifications made by others.
54
55This License is a kind of "copyleft", which means that derivative
56works of the document must themselves be free in the same sense.  It
57complements the GNU General Public License, which is a copyleft
58license designed for free software.
59
60We have designed this License in order to use it for manuals for free
61software, because free software needs free documentation: a free
62program should come with manuals providing the same freedoms that the
63software does.  But this License is not limited to software manuals;
64it can be used for any textual work, regardless of subject matter or
65whether it is published as a printed book.  We recommend this License
66principally for works whose purpose is instruction or reference.
67
68
69\begin{center}
70{\Large\bf 1. APPLICABILITY AND DEFINITIONS}
71\addcontentsline{toc}{section}{1. APPLICABILITY AND DEFINITIONS}
72\end{center}
73
74This License applies to any manual or other work, in any medium, that
75contains a notice placed by the copyright holder saying it can be
76distributed under the terms of this License.  Such a notice grants a
77world-wide, royalty-free license, unlimited in duration, to use that
78work under the conditions stated herein.  The \textbf{"Document"}, below,
79refers to any such manual or work.  Any member of the public is a
80licensee, and is addressed as \textbf{"you"}.  You accept the license if you
81copy, modify or distribute the work in a way requiring permission
82under copyright law.
83
84A \textbf{"Modified Version"} of the Document means any work containing the
85Document or a portion of it, either copied verbatim, or with
86modifications and/or translated into another language.
87
88A \textbf{"Secondary Section"} is a named appendix or a front-matter section of
89the Document that deals exclusively with the relationship of the
90publishers or authors of the Document to the Document's overall subject
91(or to related matters) and contains nothing that could fall directly
92within that overall subject.  (Thus, if the Document is in part a
93textbook of mathematics, a Secondary Section may not explain any
94mathematics.)  The relationship could be a matter of historical
95connection with the subject or with related matters, or of legal,
96commercial, philosophical, ethical or political position regarding
97them.
98
99The \textbf{"Invariant Sections"} are certain Secondary Sections whose titles
100are designated, as being those of Invariant Sections, in the notice
101that says that the Document is released under this License.  If a
102section does not fit the above definition of Secondary then it is not
103allowed to be designated as Invariant.  The Document may contain zero
104Invariant Sections.  If the Document does not identify any Invariant
105Sections then there are none.
106
107The \textbf{"Cover Texts"} are certain short passages of text that are listed,
108as Front-Cover Texts or Back-Cover Texts, in the notice that says that
109the Document is released under this License.  A Front-Cover Text may
110be at most 5 words, and a Back-Cover Text may be at most 25 words.
111
112A \textbf{"Transparent"} copy of the Document means a machine-readable copy,
113represented in a format whose specification is available to the
114general public, that is suitable for revising the document
115straightforwardly with generic text editors or (for images composed of
116pixels) generic paint programs or (for drawings) some widely available
117drawing editor, and that is suitable for input to text formatters or
118for automatic translation to a variety of formats suitable for input
119to text formatters.  A copy made in an otherwise Transparent file
120format whose markup, or absence of markup, has been arranged to thwart
121or discourage subsequent modification by readers is not Transparent.
122An image format is not Transparent if used for any substantial amount
123of text.  A copy that is not "Transparent" is called \textbf{"Opaque"}.
124
125Examples of suitable formats for Transparent copies include plain
126ASCII without markup, Texinfo input format, LaTeX input format, SGML
127or XML using a publicly available DTD, and standard-conforming simple
128HTML, PostScript or PDF designed for human modification.  Examples of
129transparent image formats include PNG, XCF and JPG.  Opaque formats
130include proprietary formats that can be read and edited only by
131proprietary word processors, SGML or XML for which the DTD and/or
132processing tools are not generally available, and the
133machine-generated HTML, PostScript or PDF produced by some word
134processors for output purposes only.
135
136The \textbf{"Title Page"} means, for a printed book, the title page itself,
137plus such following pages as are needed to hold, legibly, the material
138this License requires to appear in the title page.  For works in
139formats which do not have any title page as such, "Title Page" means
140the text near the most prominent appearance of the work's title,
141preceding the beginning of the body of the text.
142
143A section \textbf{"Entitled XYZ"} means a named subunit of the Document whose
144title either is precisely XYZ or contains XYZ in parentheses following
145text that translates XYZ in another language.  (Here XYZ stands for a
146specific section name mentioned below, such as \textbf{"Acknowledgements"},
147\textbf{"Dedications"}, \textbf{"Endorsements"}, or \textbf{"History"}.)
148To \textbf{"Preserve the Title"}
149of such a section when you modify the Document means that it remains a
150section "Entitled XYZ" according to this definition.
151
152The Document may include Warranty Disclaimers next to the notice which
153states that this License applies to the Document.  These Warranty
154Disclaimers are considered to be included by reference in this
155License, but only as regards disclaiming warranties: any other
156implication that these Warranty Disclaimers may have is void and has
157no effect on the meaning of this License.
158
159
160\begin{center}
161{\Large\bf 2. VERBATIM COPYING}
162\addcontentsline{toc}{section}{2. VERBATIM COPYING}
163\end{center}
164
165You may copy and distribute the Document in any medium, either
166commercially or noncommercially, provided that this License, the
167copyright notices, and the license notice saying this License applies
168to the Document are reproduced in all copies, and that you add no other
169conditions whatsoever to those of this License.  You may not use
170technical measures to obstruct or control the reading or further
171copying of the copies you make or distribute.  However, you may accept
172compensation in exchange for copies.  If you distribute a large enough
173number of copies you must also follow the conditions in section 3.
174
175You may also lend copies, under the same conditions stated above, and
176you may publicly display copies.
177
178
179\begin{center}
180{\Large\bf 3. COPYING IN QUANTITY}
181\addcontentsline{toc}{section}{3. COPYING IN QUANTITY}
182\end{center}
183
184
185If you publish printed copies (or copies in media that commonly have
186printed covers) of the Document, numbering more than 100, and the
187Document's license notice requires Cover Texts, you must enclose the
188copies in covers that carry, clearly and legibly, all these Cover
189Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on
190the back cover.  Both covers must also clearly and legibly identify
191you as the publisher of these copies.  The front cover must present
192the full title with all words of the title equally prominent and
193visible.  You may add other material on the covers in addition.
194Copying with changes limited to the covers, as long as they preserve
195the title of the Document and satisfy these conditions, can be treated
196as verbatim copying in other respects.
197
198If the required texts for either cover are too voluminous to fit
199legibly, you should put the first ones listed (as many as fit
200reasonably) on the actual cover, and continue the rest onto adjacent
201pages.
202
203If you publish or distribute Opaque copies of the Document numbering
204more than 100, you must either include a machine-readable Transparent
205copy along with each Opaque copy, or state in or with each Opaque copy
206a computer-network location from which the general network-using
207public has access to download using public-standard network protocols
208a complete Transparent copy of the Document, free of added material.
209If you use the latter option, you must take reasonably prudent steps,
210when you begin distribution of Opaque copies in quantity, to ensure
211that this Transparent copy will remain thus accessible at the stated
212location until at least one year after the last time you distribute an
213Opaque copy (directly or through your agents or retailers) of that
214edition to the public.
215
216It is requested, but not required, that you contact the authors of the
217Document well before redistributing any large number of copies, to give
218them a chance to provide you with an updated version of the Document.
219
220
221\begin{center}
222{\Large\bf 4. MODIFICATIONS}
223\addcontentsline{toc}{section}{4. MODIFICATIONS}
224\end{center}
225
226You may copy and distribute a Modified Version of the Document under
227the conditions of sections 2 and 3 above, provided that you release
228the Modified Version under precisely this License, with the Modified
229Version filling the role of the Document, thus licensing distribution
230and modification of the Modified Version to whoever possesses a copy
231of it.  In addition, you must do these things in the Modified Version:
232
233\begin{itemize}
234\item[A.]
235   Use in the Title Page (and on the covers, if any) a title distinct
236   from that of the Document, and from those of previous versions
237   (which should, if there were any, be listed in the History section
238   of the Document).  You may use the same title as a previous version
239   if the original publisher of that version gives permission.
240
241\item[B.]
242   List on the Title Page, as authors, one or more persons or entities
243   responsible for authorship of the modifications in the Modified
244   Version, together with at least five of the principal authors of the
245   Document (all of its principal authors, if it has fewer than five),
246   unless they release you from this requirement.
247
248\item[C.]
249   State on the Title page the name of the publisher of the
250   Modified Version, as the publisher.
251
252\item[D.]
253   Preserve all the copyright notices of the Document.
254
255\item[E.]
256   Add an appropriate copyright notice for your modifications
257   adjacent to the other copyright notices.
258
259\item[F.]
260   Include, immediately after the copyright notices, a license notice
261   giving the public permission to use the Modified Version under the
262   terms of this License, in the form shown in the Addendum below.
263
264\item[G.]
265   Preserve in that license notice the full lists of Invariant Sections
266   and required Cover Texts given in the Document's license notice.
267
268\item[H.]
269   Include an unaltered copy of this License.
270
271\item[I.]
272   Preserve the section Entitled "History", Preserve its Title, and add
273   to it an item stating at least the title, year, new authors, and
274   publisher of the Modified Version as given on the Title Page.  If
275   there is no section Entitled "History" in the Document, create one
276   stating the title, year, authors, and publisher of the Document as
277   given on its Title Page, then add an item describing the Modified
278   Version as stated in the previous sentence.
279
280\item[J.]
281   Preserve the network location, if any, given in the Document for
282   public access to a Transparent copy of the Document, and likewise
283   the network locations given in the Document for previous versions
284   it was based on.  These may be placed in the "History" section.
285   You may omit a network location for a work that was published at
286   least four years before the Document itself, or if the original
287   publisher of the version it refers to gives permission.
288
289\item[K.]
290   For any section Entitled "Acknowledgements" or "Dedications",
291   Preserve the Title of the section, and preserve in the section all
292   the substance and tone of each of the contributor acknowledgements
293   and/or dedications given therein.
294
295\item[L.]
296   Preserve all the Invariant Sections of the Document,
297   unaltered in their text and in their titles.  Section numbers
298   or the equivalent are not considered part of the section titles.
299
300\item[M.]
301   Delete any section Entitled "Endorsements".  Such a section
302   may not be included in the Modified Version.
303
304\item[N.]
305   Do not retitle any existing section to be Entitled "Endorsements"
306   or to conflict in title with any Invariant Section.
307
308\item[O.]
309   Preserve any Warranty Disclaimers.
310\end{itemize}
311
312If the Modified Version includes new front-matter sections or
313appendices that qualify as Secondary Sections and contain no material
314copied from the Document, you may at your option designate some or all
315of these sections as invariant.  To do this, add their titles to the
316list of Invariant Sections in the Modified Version's license notice.
317These titles must be distinct from any other section titles.
318
319You may add a section Entitled "Endorsements", provided it contains
320nothing but endorsements of your Modified Version by various
321parties--for example, statements of peer review or that the text has
322been approved by an organization as the authoritative definition of a
323standard.
324
325You may add a passage of up to five words as a Front-Cover Text, and a
326passage of up to 25 words as a Back-Cover Text, to the end of the list
327of Cover Texts in the Modified Version.  Only one passage of
328Front-Cover Text and one of Back-Cover Text may be added by (or
329through arrangements made by) any one entity.  If the Document already
330includes a cover text for the same cover, previously added by you or
331by arrangement made by the same entity you are acting on behalf of,
332you may not add another; but you may replace the old one, on explicit
333permission from the previous publisher that added the old one.
334
335The author(s) and publisher(s) of the Document do not by this License
336give permission to use their names for publicity for or to assert or
337imply endorsement of any Modified Version.
338
339
340\begin{center}
341{\Large\bf 5. COMBINING DOCUMENTS}
342\addcontentsline{toc}{section}{5. COMBINING DOCUMENTS}
343\end{center}
344
345
346You may combine the Document with other documents released under this
347License, under the terms defined in section 4 above for modified
348versions, provided that you include in the combination all of the
349Invariant Sections of all of the original documents, unmodified, and
350list them all as Invariant Sections of your combined work in its
351license notice, and that you preserve all their Warranty Disclaimers.
352
353The combined work need only contain one copy of this License, and
354multiple identical Invariant Sections may be replaced with a single
355copy.  If there are multiple Invariant Sections with the same name but
356different contents, make the title of each such section unique by
357adding at the end of it, in parentheses, the name of the original
358author or publisher of that section if known, or else a unique number.
359Make the same adjustment to the section titles in the list of
360Invariant Sections in the license notice of the combined work.
361
362In the combination, you must combine any sections Entitled "History"
363in the various original documents, forming one section Entitled
364"History"; likewise combine any sections Entitled "Acknowledgements",
365and any sections Entitled "Dedications".  You must delete all sections
366Entitled "Endorsements".
367
368\begin{center}
369{\Large\bf 6. COLLECTIONS OF DOCUMENTS}
370\addcontentsline{toc}{section}{6. COLLECTIONS OF DOCUMENTS}
371\end{center}
372
373You may make a collection consisting of the Document and other documents
374released under this License, and replace the individual copies of this
375License in the various documents with a single copy that is included in
376the collection, provided that you follow the rules of this License for
377verbatim copying of each of the documents in all other respects.
378
379You may extract a single document from such a collection, and distribute
380it individually under this License, provided you insert a copy of this
381License into the extracted document, and follow this License in all
382other respects regarding verbatim copying of that document.
383
384
385\begin{center}
386{\Large\bf 7. AGGREGATION WITH INDEPENDENT WORKS}
387\addcontentsline{toc}{section}{7. AGGREGATION WITH INDEPENDENT WORKS}
388\end{center}
389
390
391A compilation of the Document or its derivatives with other separate
392and independent documents or works, in or on a volume of a storage or
393distribution medium, is called an "aggregate" if the copyright
394resulting from the compilation is not used to limit the legal rights
395of the compilation's users beyond what the individual works permit.
396When the Document is included in an aggregate, this License does not
397apply to the other works in the aggregate which are not themselves
398derivative works of the Document.
399
400If the Cover Text requirement of section 3 is applicable to these
401copies of the Document, then if the Document is less than one half of
402the entire aggregate, the Document's Cover Texts may be placed on
403covers that bracket the Document within the aggregate, or the
404electronic equivalent of covers if the Document is in electronic form.
405Otherwise they must appear on printed covers that bracket the whole
406aggregate.
407
408
409\begin{center}
410{\Large\bf 8. TRANSLATION}
411\addcontentsline{toc}{section}{8. TRANSLATION}
412\end{center}
413
414
415Translation is considered a kind of modification, so you may
416distribute translations of the Document under the terms of section 4.
417Replacing Invariant Sections with translations requires special
418permission from their copyright holders, but you may include
419translations of some or all Invariant Sections in addition to the
420original versions of these Invariant Sections.  You may include a
421translation of this License, and all the license notices in the
422Document, and any Warranty Disclaimers, provided that you also include
423the original English version of this License and the original versions
424of those notices and disclaimers.  In case of a disagreement between
425the translation and the original version of this License or a notice
426or disclaimer, the original version will prevail.
427
428If a section in the Document is Entitled "Acknowledgements",
429"Dedications", or "History", the requirement (section 4) to Preserve
430its Title (section 1) will typically require changing the actual
431title.
432
433
434\begin{center}
435{\Large\bf 9. TERMINATION}
436\addcontentsline{toc}{section}{9. TERMINATION}
437\end{center}
438
439
440You may not copy, modify, sublicense, or distribute the Document except
441as expressly provided for under this License.  Any other attempt to
442copy, modify, sublicense or distribute the Document is void, and will
443automatically terminate your rights under this License.  However,
444parties who have received copies, or rights, from you under this
445License will not have their licenses terminated so long as such
446parties remain in full compliance.
447
448
449\begin{center}
450{\Large\bf 10. FUTURE REVISIONS OF THIS LICENSE}
451\addcontentsline{toc}{section}{10. FUTURE REVISIONS OF THIS LICENSE}
452\end{center}
453
454
455The Free Software Foundation may publish new, revised versions
456of the GNU Free Documentation License from time to time.  Such new
457versions will be similar in spirit to the present version, but may
458differ in detail to address new problems or concerns.  See
459http://www.gnu.org/copyleft/.
460
461Each version of the License is given a distinguishing version number.
462If the Document specifies that a particular numbered version of this
463License "or any later version" applies to it, you have the option of
464following the terms and conditions either of that specified version or
465of any later version that has been published (not as a draft) by the
466Free Software Foundation.  If the Document does not specify a version
467number of this License, you may choose any version ever published (not
468as a draft) by the Free Software Foundation.
469
470
471\begin{center}
472{\Large\bf ADDENDUM: How to use this License for your documents}
473\addcontentsline{toc}{section}{ADDENDUM: How to use this License for your documents}
474\end{center}
475
476To use this License in a document you have written, include a copy of
477the License in the document and put the following copyright and
478license notices just after the title page:
479
480\bigskip
481\begin{quote}
482    Copyright \copyright  YEAR  YOUR NAME.
483    Permission is granted to copy, distribute and/or modify this document
484    under the terms of the GNU Free Documentation License, Version 1.2
485    or any later version published by the Free Software Foundation;
486    with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
487    A copy of the license is included in the section entitled "GNU
488    Free Documentation License".
489\end{quote}
490\bigskip
491
492If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
493replace the "with...Texts." line with this:
494
495\bigskip
496\begin{quote}
497    with the Invariant Sections being LIST THEIR TITLES, with the
498    Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST.
499\end{quote}
500\bigskip
501
502If you have Invariant Sections without Cover Texts, or some other
503combination of the three, merge those two alternatives to suit the
504situation.
505
506If your document contains nontrivial examples of program code, we
507recommend releasing these examples in parallel under your choice of
508free software license, such as the GNU General Public License,
509to permit their use in free software.
510
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