1130561Sobrien@c -*-texinfo-*-
2130561Sobrien@node GNU Free Documentation License
3130561Sobrien
4130561Sobrien@appendix GNU Free Documentation License
5130561Sobrien@center Version 1.1, March 2000
6130561Sobrien
7130561Sobrien@display
8218822SdimCopyright (C) 2000, 2003  Free Software Foundation, Inc.
9218822Sdim51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
10130561Sobrien
11130561SobrienEveryone is permitted to copy and distribute verbatim copies
12130561Sobrienof this license document, but changing it is not allowed.
13130561Sobrien@end display
14130561Sobrien@sp 1
15130561Sobrien@enumerate 0
16130561Sobrien@item
17130561SobrienPREAMBLE
18130561Sobrien
19130561SobrienThe purpose of this License is to make a manual, textbook, or other
20130561Sobrienwritten document ``free'' in the sense of freedom: to assure everyone
21130561Sobrienthe effective freedom to copy and redistribute it, with or without
22130561Sobrienmodifying it, either commercially or noncommercially.  Secondarily,
23130561Sobrienthis License preserves for the author and publisher a way to get
24130561Sobriencredit for their work, while not being considered responsible for
25130561Sobrienmodifications made by others.
26130561Sobrien
27130561SobrienThis License is a kind of ``copyleft'', which means that derivative
28130561Sobrienworks of the document must themselves be free in the same sense.  It
29130561Sobriencomplements the GNU General Public License, which is a copyleft
30130561Sobrienlicense designed for free software.
31130561Sobrien
32130561SobrienWe have designed this License in order to use it for manuals for free
33130561Sobriensoftware, because free software needs free documentation: a free
34130561Sobrienprogram should come with manuals providing the same freedoms that the
35130561Sobriensoftware does.  But this License is not limited to software manuals;
36130561Sobrienit can be used for any textual work, regardless of subject matter or
37130561Sobrienwhether it is published as a printed book.  We recommend this License
38130561Sobrienprincipally for works whose purpose is instruction or reference.
39130561Sobrien
40130561Sobrien@sp 1
41130561Sobrien@item
42130561SobrienAPPLICABILITY AND DEFINITIONS
43130561Sobrien
44130561SobrienThis License applies to any manual or other work that contains a
45130561Sobriennotice placed by the copyright holder saying it can be distributed
46130561Sobrienunder the terms of this License.  The ``Document'', below, refers to any
47130561Sobriensuch manual or work.  Any member of the public is a licensee, and is
48130561Sobrienaddressed as ``you.''
49130561Sobrien
50130561SobrienA ``Modified Version'' of the Document means any work containing the
51130561SobrienDocument or a portion of it, either copied verbatim, or with
52130561Sobrienmodifications and/or translated into another language.
53130561Sobrien
54130561SobrienA ``Secondary Section'' is a named appendix or a front-matter section of
55130561Sobrienthe Document that deals exclusively with the relationship of the
56130561Sobrienpublishers or authors of the Document to the Document's overall subject
57130561Sobrien(or to related matters) and contains nothing that could fall directly
58130561Sobrienwithin that overall subject.  (For example, if the Document is in part a
59130561Sobrientextbook of mathematics, a Secondary Section may not explain any
60130561Sobrienmathematics.)  The relationship could be a matter of historical
61130561Sobrienconnection with the subject or with related matters, or of legal,
62130561Sobriencommercial, philosophical, ethical or political position regarding
63130561Sobrienthem.
64130561Sobrien
65130561SobrienThe ``Invariant Sections'' are certain Secondary Sections whose titles
66130561Sobrienare designated, as being those of Invariant Sections, in the notice
67130561Sobrienthat says that the Document is released under this License.
68130561Sobrien
69130561SobrienThe ``Cover Texts'' are certain short passages of text that are listed,
70130561Sobrienas Front-Cover Texts or Back-Cover Texts, in the notice that says that
71130561Sobrienthe Document is released under this License.
72130561Sobrien
73130561SobrienA ``Transparent'' copy of the Document means a machine-readable copy,
74130561Sobrienrepresented in a format whose specification is available to the
75130561Sobriengeneral public, whose contents can be viewed and edited directly and
76130561Sobrienstraightforwardly with generic text editors or (for images composed of
77130561Sobrienpixels) generic paint programs or (for drawings) some widely available
78130561Sobriendrawing editor, and that is suitable for input to text formatters or
79130561Sobrienfor automatic translation to a variety of formats suitable for input
80130561Sobriento text formatters.  A copy made in an otherwise Transparent file
81130561Sobrienformat whose markup has been designed to thwart or discourage
82130561Sobriensubsequent modification by readers is not Transparent.  A copy that is
83130561Sobriennot ``Transparent'' is called ``Opaque.''
84130561Sobrien
85130561SobrienExamples of suitable formats for Transparent copies include plain
86130561SobrienASCII without markup, Texinfo input format, LaTeX input format, SGML
87130561Sobrienor XML using a publicly available DTD, and standard-conforming simple
88130561SobrienHTML designed for human modification.  Opaque formats include
89130561SobrienPostScript, PDF, proprietary formats that can be read and edited only
90130561Sobrienby proprietary word processors, SGML or XML for which the DTD and/or
91130561Sobrienprocessing tools are not generally available, and the
92130561Sobrienmachine-generated HTML produced by some word processors for output
93130561Sobrienpurposes only.
94130561Sobrien
95130561SobrienThe ``Title Page'' means, for a printed book, the title page itself,
96130561Sobrienplus such following pages as are needed to hold, legibly, the material
97130561Sobrienthis License requires to appear in the title page.  For works in
98130561Sobrienformats which do not have any title page as such, ``Title Page'' means
99130561Sobrienthe text near the most prominent appearance of the work's title,
100130561Sobrienpreceding the beginning of the body of the text.
101130561Sobrien@sp 1
102130561Sobrien@item
103130561SobrienVERBATIM COPYING
104130561Sobrien
105130561SobrienYou may copy and distribute the Document in any medium, either
106130561Sobriencommercially or noncommercially, provided that this License, the
107130561Sobriencopyright notices, and the license notice saying this License applies
108130561Sobriento the Document are reproduced in all copies, and that you add no other
109130561Sobrienconditions whatsoever to those of this License.  You may not use
110130561Sobrientechnical measures to obstruct or control the reading or further
111130561Sobriencopying of the copies you make or distribute.  However, you may accept
112130561Sobriencompensation in exchange for copies.  If you distribute a large enough
113130561Sobriennumber of copies you must also follow the conditions in section 3.
114130561Sobrien
115130561SobrienYou may also lend copies, under the same conditions stated above, and
116130561Sobrienyou may publicly display copies.
117130561Sobrien@sp 1
118130561Sobrien@item
119130561SobrienCOPYING IN QUANTITY
120130561Sobrien
121130561SobrienIf you publish printed copies of the Document numbering more than 100,
122130561Sobrienand the Document's license notice requires Cover Texts, you must enclose
123130561Sobrienthe copies in covers that carry, clearly and legibly, all these Cover
124130561SobrienTexts: Front-Cover Texts on the front cover, and Back-Cover Texts on
125130561Sobrienthe back cover.  Both covers must also clearly and legibly identify
126130561Sobrienyou as the publisher of these copies.  The front cover must present
127130561Sobrienthe full title with all words of the title equally prominent and
128130561Sobrienvisible.  You may add other material on the covers in addition.
129130561SobrienCopying with changes limited to the covers, as long as they preserve
130130561Sobrienthe title of the Document and satisfy these conditions, can be treated
131130561Sobrienas verbatim copying in other respects.
132130561Sobrien
133130561SobrienIf the required texts for either cover are too voluminous to fit
134130561Sobrienlegibly, you should put the first ones listed (as many as fit
135130561Sobrienreasonably) on the actual cover, and continue the rest onto adjacent
136130561Sobrienpages.
137130561Sobrien
138130561SobrienIf you publish or distribute Opaque copies of the Document numbering
139130561Sobrienmore than 100, you must either include a machine-readable Transparent
140130561Sobriencopy along with each Opaque copy, or state in or with each Opaque copy
141130561Sobriena publicly-accessible computer-network location containing a complete
142130561SobrienTransparent copy of the Document, free of added material, which the
143130561Sobriengeneral network-using public has access to download anonymously at no
144130561Sobriencharge using public-standard network protocols.  If you use the latter
145130561Sobrienoption, you must take reasonably prudent steps, when you begin
146130561Sobriendistribution of Opaque copies in quantity, to ensure that this
147130561SobrienTransparent copy will remain thus accessible at the stated location
148130561Sobrienuntil at least one year after the last time you distribute an Opaque
149130561Sobriencopy (directly or through your agents or retailers) of that edition to
150130561Sobrienthe public.
151130561Sobrien
152130561SobrienIt is requested, but not required, that you contact the authors of the
153130561SobrienDocument well before redistributing any large number of copies, to give
154130561Sobrienthem a chance to provide you with an updated version of the Document.
155130561Sobrien@sp 1
156130561Sobrien@item
157130561SobrienMODIFICATIONS
158130561Sobrien
159130561SobrienYou may copy and distribute a Modified Version of the Document under
160130561Sobrienthe conditions of sections 2 and 3 above, provided that you release
161130561Sobrienthe Modified Version under precisely this License, with the Modified
162130561SobrienVersion filling the role of the Document, thus licensing distribution
163130561Sobrienand modification of the Modified Version to whoever possesses a copy
164130561Sobrienof it.  In addition, you must do these things in the Modified Version:
165130561Sobrien
166130561SobrienA. Use in the Title Page (and on the covers, if any) a title distinct
167130561Sobrien   from that of the Document, and from those of previous versions
168130561Sobrien   (which should, if there were any, be listed in the History section
169130561Sobrien   of the Document).  You may use the same title as a previous version
170130561Sobrien   if the original publisher of that version gives permission.@*
171130561SobrienB. List on the Title Page, as authors, one or more persons or entities
172130561Sobrien   responsible for authorship of the modifications in the Modified
173130561Sobrien   Version, together with at least five of the principal authors of the
174130561Sobrien   Document (all of its principal authors, if it has less than five).@*
175130561SobrienC. State on the Title page the name of the publisher of the
176130561Sobrien   Modified Version, as the publisher.@*
177130561SobrienD. Preserve all the copyright notices of the Document.@*
178130561SobrienE. Add an appropriate copyright notice for your modifications
179130561Sobrien   adjacent to the other copyright notices.@*
180130561SobrienF. Include, immediately after the copyright notices, a license notice
181130561Sobrien   giving the public permission to use the Modified Version under the
182130561Sobrien   terms of this License, in the form shown in the Addendum below.@*
183130561SobrienG. Preserve in that license notice the full lists of Invariant Sections
184130561Sobrien   and required Cover Texts given in the Document's license notice.@*
185130561SobrienH. Include an unaltered copy of this License.@*
186130561SobrienI. Preserve the section entitled ``History'', and its title, and add to
187130561Sobrien   it an item stating at least the title, year, new authors, and
188130561Sobrien   publisher of the Modified Version as given on the Title Page.  If
189130561Sobrien   there is no section entitled ``History'' in the Document, create one
190130561Sobrien   stating the title, year, authors, and publisher of the Document as
191130561Sobrien   given on its Title Page, then add an item describing the Modified
192130561Sobrien   Version as stated in the previous sentence.@*
193130561SobrienJ. Preserve the network location, if any, given in the Document for
194130561Sobrien   public access to a Transparent copy of the Document, and likewise
195130561Sobrien   the network locations given in the Document for previous versions
196130561Sobrien   it was based on.  These may be placed in the ``History'' section.
197130561Sobrien   You may omit a network location for a work that was published at
198130561Sobrien   least four years before the Document itself, or if the original
199130561Sobrien   publisher of the version it refers to gives permission.@*
200130561SobrienK. In any section entitled ``Acknowledgements'' or ``Dedications'',
201130561Sobrien   preserve the section's title, and preserve in the section all the
202130561Sobrien   substance and tone of each of the contributor acknowledgements
203130561Sobrien   and/or dedications given therein.@*
204130561SobrienL. Preserve all the Invariant Sections of the Document,
205130561Sobrien   unaltered in their text and in their titles.  Section numbers
206130561Sobrien   or the equivalent are not considered part of the section titles.@*
207130561SobrienM. Delete any section entitled ``Endorsements.''  Such a section
208130561Sobrien   may not be included in the Modified Version.@*
209130561SobrienN. Do not retitle any existing section as ``Endorsements''
210130561Sobrien   or to conflict in title with any Invariant Section.@*
211130561Sobrien@sp 1
212130561SobrienIf the Modified Version includes new front-matter sections or
213130561Sobrienappendices that qualify as Secondary Sections and contain no material
214130561Sobriencopied from the Document, you may at your option designate some or all
215130561Sobrienof these sections as invariant.  To do this, add their titles to the
216130561Sobrienlist of Invariant Sections in the Modified Version's license notice.
217130561SobrienThese titles must be distinct from any other section titles.
218130561Sobrien
219130561SobrienYou may add a section entitled ``Endorsements'', provided it contains
220130561Sobriennothing but endorsements of your Modified Version by various
221130561Sobrienparties--for example, statements of peer review or that the text has
222130561Sobrienbeen approved by an organization as the authoritative definition of a
223130561Sobrienstandard.
224130561Sobrien
225130561SobrienYou may add a passage of up to five words as a Front-Cover Text, and a
226130561Sobrienpassage of up to 25 words as a Back-Cover Text, to the end of the list
227130561Sobrienof Cover Texts in the Modified Version.  Only one passage of
228130561SobrienFront-Cover Text and one of Back-Cover Text may be added by (or
229130561Sobrienthrough arrangements made by) any one entity.  If the Document already
230130561Sobrienincludes a cover text for the same cover, previously added by you or
231130561Sobrienby arrangement made by the same entity you are acting on behalf of,
232130561Sobrienyou may not add another; but you may replace the old one, on explicit
233130561Sobrienpermission from the previous publisher that added the old one.
234130561Sobrien
235130561SobrienThe author(s) and publisher(s) of the Document do not by this License
236130561Sobriengive permission to use their names for publicity for or to assert or
237130561Sobrienimply endorsement of any Modified Version.
238130561Sobrien@sp 1
239130561Sobrien@item
240130561SobrienCOMBINING DOCUMENTS
241130561Sobrien
242130561SobrienYou may combine the Document with other documents released under this
243130561SobrienLicense, under the terms defined in section 4 above for modified
244130561Sobrienversions, provided that you include in the combination all of the
245130561SobrienInvariant Sections of all of the original documents, unmodified, and
246130561Sobrienlist them all as Invariant Sections of your combined work in its
247130561Sobrienlicense notice.
248130561Sobrien
249130561SobrienThe combined work need only contain one copy of this License, and
250130561Sobrienmultiple identical Invariant Sections may be replaced with a single
251130561Sobriencopy.  If there are multiple Invariant Sections with the same name but
252130561Sobriendifferent contents, make the title of each such section unique by
253130561Sobrienadding at the end of it, in parentheses, the name of the original
254130561Sobrienauthor or publisher of that section if known, or else a unique number.
255130561SobrienMake the same adjustment to the section titles in the list of
256130561SobrienInvariant Sections in the license notice of the combined work.
257130561Sobrien
258130561SobrienIn the combination, you must combine any sections entitled ``History''
259130561Sobrienin the various original documents, forming one section entitled
260130561Sobrien``History''; likewise combine any sections entitled ``Acknowledgements'',
261130561Sobrienand any sections entitled ``Dedications.''  You must delete all sections
262130561Sobrienentitled ``Endorsements.''
263130561Sobrien@sp 1
264130561Sobrien@item
265130561SobrienCOLLECTIONS OF DOCUMENTS
266130561Sobrien
267130561SobrienYou may make a collection consisting of the Document and other documents
268130561Sobrienreleased under this License, and replace the individual copies of this
269130561SobrienLicense in the various documents with a single copy that is included in
270130561Sobrienthe collection, provided that you follow the rules of this License for
271130561Sobrienverbatim copying of each of the documents in all other respects.
272130561Sobrien
273130561SobrienYou may extract a single document from such a collection, and distribute
274130561Sobrienit individually under this License, provided you insert a copy of this
275130561SobrienLicense into the extracted document, and follow this License in all
276130561Sobrienother respects regarding verbatim copying of that document.
277130561Sobrien@sp 1
278130561Sobrien@item
279130561SobrienAGGREGATION WITH INDEPENDENT WORKS
280130561Sobrien
281130561SobrienA compilation of the Document or its derivatives with other separate
282130561Sobrienand independent documents or works, in or on a volume of a storage or
283130561Sobriendistribution medium, does not as a whole count as a Modified Version
284130561Sobrienof the Document, provided no compilation copyright is claimed for the
285130561Sobriencompilation.  Such a compilation is called an ``aggregate'', and this
286130561SobrienLicense does not apply to the other self-contained works thus compiled
287130561Sobrienwith the Document, on account of their being thus compiled, if they
288130561Sobrienare not themselves derivative works of the Document.
289130561Sobrien
290130561SobrienIf the Cover Text requirement of section 3 is applicable to these
291130561Sobriencopies of the Document, then if the Document is less than one quarter
292130561Sobrienof the entire aggregate, the Document's Cover Texts may be placed on
293130561Sobriencovers that surround only the Document within the aggregate.
294130561SobrienOtherwise they must appear on covers around the whole aggregate.
295130561Sobrien@sp 1
296130561Sobrien@item
297130561SobrienTRANSLATION
298130561Sobrien
299130561SobrienTranslation is considered a kind of modification, so you may
300130561Sobriendistribute translations of the Document under the terms of section 4.
301130561SobrienReplacing Invariant Sections with translations requires special
302130561Sobrienpermission from their copyright holders, but you may include
303130561Sobrientranslations of some or all Invariant Sections in addition to the
304130561Sobrienoriginal versions of these Invariant Sections.  You may include a
305130561Sobrientranslation of this License provided that you also include the
306130561Sobrienoriginal English version of this License.  In case of a disagreement
307130561Sobrienbetween the translation and the original English version of this
308130561SobrienLicense, the original English version will prevail.
309130561Sobrien@sp 1
310130561Sobrien@item
311130561SobrienTERMINATION
312130561Sobrien
313130561SobrienYou may not copy, modify, sublicense, or distribute the Document except
314130561Sobrienas expressly provided for under this License.  Any other attempt to
315130561Sobriencopy, modify, sublicense or distribute the Document is void, and will
316130561Sobrienautomatically terminate your rights under this License.  However,
317130561Sobrienparties who have received copies, or rights, from you under this
318130561SobrienLicense will not have their licenses terminated so long as such
319130561Sobrienparties remain in full compliance.
320130561Sobrien@sp 1
321130561Sobrien@item
322130561SobrienFUTURE REVISIONS OF THIS LICENSE
323130561Sobrien
324130561SobrienThe Free Software Foundation may publish new, revised versions
325130561Sobrienof the GNU Free Documentation License from time to time.  Such new
326130561Sobrienversions will be similar in spirit to the present version, but may
327130561Sobriendiffer in detail to address new problems or concerns.  See
328130561Sobrienhttp://www.gnu.org/copyleft/.
329130561Sobrien
330130561SobrienEach version of the License is given a distinguishing version number.
331130561SobrienIf the Document specifies that a particular numbered version of this
332130561SobrienLicense ``or any later version'' applies to it, you have the option of
333130561Sobrienfollowing the terms and conditions either of that specified version or
334130561Sobrienof any later version that has been published (not as a draft) by the
335130561SobrienFree Software Foundation.  If the Document does not specify a version
336130561Sobriennumber of this License, you may choose any version ever published (not
337130561Sobrienas a draft) by the Free Software Foundation.
338130561Sobrien
339130561Sobrien@end enumerate
340130561Sobrien
341130561Sobrien@unnumberedsec ADDENDUM: How to use this License for your documents
342130561Sobrien
343130561SobrienTo use this License in a document you have written, include a copy of
344130561Sobrienthe License in the document and put the following copyright and
345130561Sobrienlicense notices just after the title page:
346130561Sobrien
347130561Sobrien@smallexample
348130561Sobrien@group
349130561SobrienCopyright (C)  @var{year}  @var{your name}.
350130561SobrienPermission is granted to copy, distribute and/or modify this document
351130561Sobrienunder the terms of the GNU Free Documentation License, Version 1.1
352130561Sobrienor any later version published by the Free Software Foundation;
353130561Sobrienwith the Invariant Sections being @var{list their titles}, with the
354130561SobrienFront-Cover Texts being @var{list}, and with the Back-Cover Texts being @var{list}.
355130561SobrienA copy of the license is included in the section entitled "GNU
356130561SobrienFree Documentation License."
357130561Sobrien@end group
358130561Sobrien@end smallexample
359130561Sobrien
360130561SobrienIf you have no Invariant Sections, write ``with no Invariant Sections''
361130561Sobrieninstead of saying which ones are invariant.  If you have no
362130561SobrienFront-Cover Texts, write ``no Front-Cover Texts'' instead of
363130561Sobrien``Front-Cover Texts being @var{list}''; likewise for Back-Cover Texts.
364130561Sobrien
365130561SobrienIf your document contains nontrivial examples of program code, we
366130561Sobrienrecommend releasing these examples in parallel under your choice of
367130561Sobrienfree software license, such as the GNU General Public License,
368130561Sobriento permit their use in free software.
369