1@c -*-texinfo-*-
2@node GNU Free Documentation License
3@appendix GNU Free Documentation License
4@center Version 1.1, March 2000
5
6@display
7Copyright (C) 2000, 2003 Free Software Foundation, Inc.
851 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
9
10Everyone is permitted to copy and distribute verbatim copies
11of this license document, but changing it is not allowed.
12@end display
13@sp 1
14@enumerate 0
15@item
16PREAMBLE
17
18The purpose of this License is to make a manual, textbook, or other
19written document ``free'' in the sense of freedom: to assure everyone
20the effective freedom to copy and redistribute it, with or without
21modifying it, either commercially or noncommercially.  Secondarily,
22this License preserves for the author and publisher a way to get
23credit for their work, while not being considered responsible for
24modifications made by others.
25
26This License is a kind of ``copyleft'', which means that derivative
27works of the document must themselves be free in the same sense.  It
28complements the GNU General Public License, which is a copyleft
29license designed for free software.
30
31We have designed this License in order to use it for manuals for free
32software, because free software needs free documentation: a free
33program should come with manuals providing the same freedoms that the
34software does.  But this License is not limited to software manuals;
35it can be used for any textual work, regardless of subject matter or
36whether it is published as a printed book.  We recommend this License
37principally for works whose purpose is instruction or reference.
38
39@sp 1
40@item
41APPLICABILITY AND DEFINITIONS
42
43This License applies to any manual or other work that contains a
44notice placed by the copyright holder saying it can be distributed
45under the terms of this License.  The ``Document'', below, refers to any
46such manual or work.  Any member of the public is a licensee, and is
47addressed as ``you.''
48
49A ``Modified Version'' of the Document means any work containing the
50Document or a portion of it, either copied verbatim, or with
51modifications and/or translated into another language.
52
53A ``Secondary Section'' is a named appendix or a front-matter section of
54the Document that deals exclusively with the relationship of the
55publishers or authors of the Document to the Document's overall subject
56(or to related matters) and contains nothing that could fall directly
57within that overall subject.  (For example, if the Document is in part a
58textbook of mathematics, a Secondary Section may not explain any
59mathematics.)  The relationship could be a matter of historical
60connection with the subject or with related matters, or of legal,
61commercial, philosophical, ethical or political position regarding
62them.
63
64The ``Invariant Sections'' are certain Secondary Sections whose titles
65are designated, as being those of Invariant Sections, in the notice
66that says that the Document is released under this License.
67
68The ``Cover Texts'' are certain short passages of text that are listed,
69as Front-Cover Texts or Back-Cover Texts, in the notice that says that
70the Document is released under this License.
71
72A ``Transparent'' copy of the Document means a machine-readable copy,
73represented in a format whose specification is available to the
74general public, whose contents can be viewed and edited directly and
75straightforwardly with generic text editors or (for images composed of
76pixels) generic paint programs or (for drawings) some widely available
77drawing editor, and that is suitable for input to text formatters or
78for automatic translation to a variety of formats suitable for input
79to text formatters.  A copy made in an otherwise Transparent file
80format whose markup has been designed to thwart or discourage
81subsequent modification by readers is not Transparent.  A copy that is
82not ``Transparent'' is called ``Opaque.''
83
84Examples of suitable formats for Transparent copies include plain
85ASCII without markup, Texinfo input format, LaTeX input format, SGML
86or XML using a publicly available DTD, and standard-conforming simple
87HTML designed for human modification.  Opaque formats include
88PostScript, PDF, proprietary formats that can be read and edited only
89by proprietary word processors, SGML or XML for which the DTD and/or
90processing tools are not generally available, and the
91machine-generated HTML produced by some word processors for output
92purposes only.
93
94The ``Title Page'' means, for a printed book, the title page itself,
95plus such following pages as are needed to hold, legibly, the material
96this License requires to appear in the title page.  For works in
97formats which do not have any title page as such, ``Title Page'' means
98the text near the most prominent appearance of the work's title,
99preceding the beginning of the body of the text.
100@sp 1
101@item
102VERBATIM COPYING
103
104You may copy and distribute the Document in any medium, either
105commercially or noncommercially, provided that this License, the
106copyright notices, and the license notice saying this License applies
107to the Document are reproduced in all copies, and that you add no other
108conditions whatsoever to those of this License.  You may not use
109technical measures to obstruct or control the reading or further
110copying of the copies you make or distribute.  However, you may accept
111compensation in exchange for copies.  If you distribute a large enough
112number of copies you must also follow the conditions in section 3.
113
114You may also lend copies, under the same conditions stated above, and
115you may publicly display copies.
116@sp 1
117@item
118COPYING IN QUANTITY
119
120If you publish printed copies of the Document numbering more than 100,
121and the Document's license notice requires Cover Texts, you must enclose
122the copies in covers that carry, clearly and legibly, all these Cover
123Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on
124the back cover.  Both covers must also clearly and legibly identify
125you as the publisher of these copies.  The front cover must present
126the full title with all words of the title equally prominent and
127visible.  You may add other material on the covers in addition.
128Copying with changes limited to the covers, as long as they preserve
129the title of the Document and satisfy these conditions, can be treated
130as verbatim copying in other respects.
131
132If the required texts for either cover are too voluminous to fit
133legibly, you should put the first ones listed (as many as fit
134reasonably) on the actual cover, and continue the rest onto adjacent
135pages.
136
137If you publish or distribute Opaque copies of the Document numbering
138more than 100, you must either include a machine-readable Transparent
139copy along with each Opaque copy, or state in or with each Opaque copy
140a publicly-accessible computer-network location containing a complete
141Transparent copy of the Document, free of added material, which the
142general network-using public has access to download anonymously at no
143charge using public-standard network protocols.  If you use the latter
144option, you must take reasonably prudent steps, when you begin
145distribution of Opaque copies in quantity, to ensure that this
146Transparent copy will remain thus accessible at the stated location
147until at least one year after the last time you distribute an Opaque
148copy (directly or through your agents or retailers) of that edition to
149the public.
150
151It is requested, but not required, that you contact the authors of the
152Document well before redistributing any large number of copies, to give
153them a chance to provide you with an updated version of the Document.
154@sp 1
155@item
156MODIFICATIONS
157
158You may copy and distribute a Modified Version of the Document under
159the conditions of sections 2 and 3 above, provided that you release
160the Modified Version under precisely this License, with the Modified
161Version filling the role of the Document, thus licensing distribution
162and modification of the Modified Version to whoever possesses a copy
163of it.  In addition, you must do these things in the Modified Version:
164
165A. Use in the Title Page (and on the covers, if any) a title distinct
166   from that of the Document, and from those of previous versions
167   (which should, if there were any, be listed in the History section
168   of the Document).  You may use the same title as a previous version
169   if the original publisher of that version gives permission.@*
170B. List on the Title Page, as authors, one or more persons or entities
171   responsible for authorship of the modifications in the Modified
172   Version, together with at least five of the principal authors of the
173   Document (all of its principal authors, if it has less than five).@*
174C. State on the Title page the name of the publisher of the
175   Modified Version, as the publisher.@*
176D. Preserve all the copyright notices of the Document.@*
177E. Add an appropriate copyright notice for your modifications
178   adjacent to the other copyright notices.@*
179F. Include, immediately after the copyright notices, a license notice
180   giving the public permission to use the Modified Version under the
181   terms of this License, in the form shown in the Addendum below.@*
182G. Preserve in that license notice the full lists of Invariant Sections
183   and required Cover Texts given in the Document's license notice.@*
184H. Include an unaltered copy of this License.@*
185I. Preserve the section entitled ``History'', and its title, and add to
186   it an item stating at least the title, year, new authors, and
187   publisher of the Modified Version as given on the Title Page.  If
188   there is no section entitled ``History'' in the Document, create one
189   stating the title, year, authors, and publisher of the Document as
190   given on its Title Page, then add an item describing the Modified
191   Version as stated in the previous sentence.@*
192J. Preserve the network location, if any, given in the Document for
193   public access to a Transparent copy of the Document, and likewise
194   the network locations given in the Document for previous versions
195   it was based on.  These may be placed in the ``History'' section.
196   You may omit a network location for a work that was published at
197   least four years before the Document itself, or if the original
198   publisher of the version it refers to gives permission.@*
199K. In any section entitled ``Acknowledgements'' or ``Dedications'',
200   preserve the section's title, and preserve in the section all the
201   substance and tone of each of the contributor acknowledgements
202   and/or dedications given therein.@*
203L. Preserve all the Invariant Sections of the Document,
204   unaltered in their text and in their titles.  Section numbers
205   or the equivalent are not considered part of the section titles.@*
206M. Delete any section entitled ``Endorsements.''  Such a section
207   may not be included in the Modified Version.@*
208N. Do not retitle any existing section as ``Endorsements''
209   or to conflict in title with any Invariant Section.@*
210@sp 1
211If the Modified Version includes new front-matter sections or
212appendices that qualify as Secondary Sections and contain no material
213copied from the Document, you may at your option designate some or all
214of these sections as invariant.  To do this, add their titles to the
215list of Invariant Sections in the Modified Version's license notice.
216These titles must be distinct from any other section titles.
217
218You may add a section entitled ``Endorsements'', provided it contains
219nothing but endorsements of your Modified Version by various
220parties--for example, statements of peer review or that the text has
221been approved by an organization as the authoritative definition of a
222standard.
223
224You may add a passage of up to five words as a Front-Cover Text, and a
225passage of up to 25 words as a Back-Cover Text, to the end of the list
226of Cover Texts in the Modified Version.  Only one passage of
227Front-Cover Text and one of Back-Cover Text may be added by (or
228through arrangements made by) any one entity.  If the Document already
229includes a cover text for the same cover, previously added by you or
230by arrangement made by the same entity you are acting on behalf of,
231you may not add another; but you may replace the old one, on explicit
232permission from the previous publisher that added the old one.
233
234The author(s) and publisher(s) of the Document do not by this License
235give permission to use their names for publicity for or to assert or
236imply endorsement of any Modified Version.
237@sp 1
238@item
239COMBINING DOCUMENTS
240
241You may combine the Document with other documents released under this
242License, under the terms defined in section 4 above for modified
243versions, provided that you include in the combination all of the
244Invariant Sections of all of the original documents, unmodified, and
245list them all as Invariant Sections of your combined work in its
246license notice.
247
248The combined work need only contain one copy of this License, and
249multiple identical Invariant Sections may be replaced with a single
250copy.  If there are multiple Invariant Sections with the same name but
251different contents, make the title of each such section unique by
252adding at the end of it, in parentheses, the name of the original
253author or publisher of that section if known, or else a unique number.
254Make the same adjustment to the section titles in the list of
255Invariant Sections in the license notice of the combined work.
256
257In the combination, you must combine any sections entitled ``History''
258in the various original documents, forming one section entitled
259``History''; likewise combine any sections entitled ``Acknowledgements'',
260and any sections entitled ``Dedications.''  You must delete all sections
261entitled ``Endorsements.''
262@sp 1
263@item
264COLLECTIONS OF DOCUMENTS
265
266You may make a collection consisting of the Document and other documents
267released under this License, and replace the individual copies of this
268License in the various documents with a single copy that is included in
269the collection, provided that you follow the rules of this License for
270verbatim copying of each of the documents in all other respects.
271
272You may extract a single document from such a collection, and distribute
273it individually under this License, provided you insert a copy of this
274License into the extracted document, and follow this License in all
275other respects regarding verbatim copying of that document.
276@sp 1
277@item
278AGGREGATION WITH INDEPENDENT WORKS
279
280A compilation of the Document or its derivatives with other separate
281and independent documents or works, in or on a volume of a storage or
282distribution medium, does not as a whole count as a Modified Version
283of the Document, provided no compilation copyright is claimed for the
284compilation.  Such a compilation is called an ``aggregate'', and this
285License does not apply to the other self-contained works thus compiled
286with the Document, on account of their being thus compiled, if they
287are not themselves derivative works of the Document.
288
289If the Cover Text requirement of section 3 is applicable to these
290copies of the Document, then if the Document is less than one quarter
291of the entire aggregate, the Document's Cover Texts may be placed on
292covers that surround only the Document within the aggregate.
293Otherwise they must appear on covers around the whole aggregate.
294@sp 1
295@item
296TRANSLATION
297
298Translation is considered a kind of modification, so you may
299distribute translations of the Document under the terms of section 4.
300Replacing Invariant Sections with translations requires special
301permission from their copyright holders, but you may include
302translations of some or all Invariant Sections in addition to the
303original versions of these Invariant Sections.  You may include a
304translation of this License provided that you also include the
305original English version of this License.  In case of a disagreement
306between the translation and the original English version of this
307License, the original English version will prevail.
308@sp 1
309@item
310TERMINATION
311
312You may not copy, modify, sublicense, or distribute the Document except
313as expressly provided for under this License.  Any other attempt to
314copy, modify, sublicense or distribute the Document is void, and will
315automatically terminate your rights under this License.  However,
316parties who have received copies, or rights, from you under this
317License will not have their licenses terminated so long as such
318parties remain in full compliance.
319@sp 1
320@item
321FUTURE REVISIONS OF THIS LICENSE
322
323The Free Software Foundation may publish new, revised versions
324of the GNU Free Documentation License from time to time.  Such new
325versions will be similar in spirit to the present version, but may
326differ in detail to address new problems or concerns.  See
327http://www.gnu.org/copyleft/.
328
329Each version of the License is given a distinguishing version number.
330If the Document specifies that a particular numbered version of this
331License ``or any later version'' applies to it, you have the option of
332following the terms and conditions either of that specified version or
333of any later version that has been published (not as a draft) by the
334Free Software Foundation.  If the Document does not specify a version
335number of this License, you may choose any version ever published (not
336as a draft) by the Free Software Foundation.
337
338@end enumerate
339
340@unnumberedsec ADDENDUM: How to use this License for your documents
341
342To use this License in a document you have written, include a copy of
343the License in the document and put the following copyright and
344license notices just after the title page:
345
346@smallexample
347@group
348Copyright (C)  @var{year}  @var{your name}.
349Permission is granted to copy, distribute and/or modify this document
350under the terms of the GNU Free Documentation License, Version 1.1
351or any later version published by the Free Software Foundation;
352with the Invariant Sections being @var{list their titles}, with the
353Front-Cover Texts being @var{list}, and with the Back-Cover Texts being @var{list}.
354A copy of the license is included in the section entitled "GNU
355Free Documentation License."
356@end group
357@end smallexample
358
359If you have no Invariant Sections, write ``with no Invariant Sections''
360instead of saying which ones are invariant.  If you have no
361Front-Cover Texts, write ``no Front-Cover Texts'' instead of
362``Front-Cover Texts being @var{list}''; likewise for Back-Cover Texts.
363
364If your document contains nontrivial examples of program code, we
365recommend releasing these examples in parallel under your choice of
366free software license, such as the GNU General Public License,
367to permit their use in free software.
368