1130561Sobrien@c -*-texinfo-*-
2130561Sobrien@node GNU Free Documentation License
3130561Sobrien@appendix GNU Free Documentation License
4130561Sobrien@center Version 1.1, March 2000
5130561Sobrien
6130561Sobrien@display
7218822SdimCopyright (C) 2000, 2003 Free Software Foundation, Inc.
8218822Sdim51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
9130561Sobrien
10130561SobrienEveryone is permitted to copy and distribute verbatim copies
11130561Sobrienof this license document, but changing it is not allowed.
12130561Sobrien@end display
13130561Sobrien@sp 1
14130561Sobrien@enumerate 0
15130561Sobrien@item
16130561SobrienPREAMBLE
17130561Sobrien
18130561SobrienThe purpose of this License is to make a manual, textbook, or other
19130561Sobrienwritten document ``free'' in the sense of freedom: to assure everyone
20130561Sobrienthe effective freedom to copy and redistribute it, with or without
21130561Sobrienmodifying it, either commercially or noncommercially.  Secondarily,
22130561Sobrienthis License preserves for the author and publisher a way to get
23130561Sobriencredit for their work, while not being considered responsible for
24130561Sobrienmodifications made by others.
25130561Sobrien
26130561SobrienThis License is a kind of ``copyleft'', which means that derivative
27130561Sobrienworks of the document must themselves be free in the same sense.  It
28130561Sobriencomplements the GNU General Public License, which is a copyleft
29130561Sobrienlicense designed for free software.
30130561Sobrien
31130561SobrienWe have designed this License in order to use it for manuals for free
32130561Sobriensoftware, because free software needs free documentation: a free
33130561Sobrienprogram should come with manuals providing the same freedoms that the
34130561Sobriensoftware does.  But this License is not limited to software manuals;
35130561Sobrienit can be used for any textual work, regardless of subject matter or
36130561Sobrienwhether it is published as a printed book.  We recommend this License
37130561Sobrienprincipally for works whose purpose is instruction or reference.
38130561Sobrien
39130561Sobrien@sp 1
40130561Sobrien@item
41130561SobrienAPPLICABILITY AND DEFINITIONS
42130561Sobrien
43130561SobrienThis License applies to any manual or other work that contains a
44130561Sobriennotice placed by the copyright holder saying it can be distributed
45130561Sobrienunder the terms of this License.  The ``Document'', below, refers to any
46130561Sobriensuch manual or work.  Any member of the public is a licensee, and is
47130561Sobrienaddressed as ``you.''
48130561Sobrien
49130561SobrienA ``Modified Version'' of the Document means any work containing the
50130561SobrienDocument or a portion of it, either copied verbatim, or with
51130561Sobrienmodifications and/or translated into another language.
52130561Sobrien
53130561SobrienA ``Secondary Section'' is a named appendix or a front-matter section of
54130561Sobrienthe Document that deals exclusively with the relationship of the
55130561Sobrienpublishers or authors of the Document to the Document's overall subject
56130561Sobrien(or to related matters) and contains nothing that could fall directly
57130561Sobrienwithin that overall subject.  (For example, if the Document is in part a
58130561Sobrientextbook of mathematics, a Secondary Section may not explain any
59130561Sobrienmathematics.)  The relationship could be a matter of historical
60130561Sobrienconnection with the subject or with related matters, or of legal,
61130561Sobriencommercial, philosophical, ethical or political position regarding
62130561Sobrienthem.
63130561Sobrien
64130561SobrienThe ``Invariant Sections'' are certain Secondary Sections whose titles
65130561Sobrienare designated, as being those of Invariant Sections, in the notice
66130561Sobrienthat says that the Document is released under this License.
67130561Sobrien
68130561SobrienThe ``Cover Texts'' are certain short passages of text that are listed,
69130561Sobrienas Front-Cover Texts or Back-Cover Texts, in the notice that says that
70130561Sobrienthe Document is released under this License.
71130561Sobrien
72130561SobrienA ``Transparent'' copy of the Document means a machine-readable copy,
73130561Sobrienrepresented in a format whose specification is available to the
74130561Sobriengeneral public, whose contents can be viewed and edited directly and
75130561Sobrienstraightforwardly with generic text editors or (for images composed of
76130561Sobrienpixels) generic paint programs or (for drawings) some widely available
77130561Sobriendrawing editor, and that is suitable for input to text formatters or
78130561Sobrienfor automatic translation to a variety of formats suitable for input
79130561Sobriento text formatters.  A copy made in an otherwise Transparent file
80130561Sobrienformat whose markup has been designed to thwart or discourage
81130561Sobriensubsequent modification by readers is not Transparent.  A copy that is
82130561Sobriennot ``Transparent'' is called ``Opaque.''
83130561Sobrien
84130561SobrienExamples of suitable formats for Transparent copies include plain
85130561SobrienASCII without markup, Texinfo input format, LaTeX input format, SGML
86130561Sobrienor XML using a publicly available DTD, and standard-conforming simple
87130561SobrienHTML designed for human modification.  Opaque formats include
88130561SobrienPostScript, PDF, proprietary formats that can be read and edited only
89130561Sobrienby proprietary word processors, SGML or XML for which the DTD and/or
90130561Sobrienprocessing tools are not generally available, and the
91130561Sobrienmachine-generated HTML produced by some word processors for output
92130561Sobrienpurposes only.
93130561Sobrien
94130561SobrienThe ``Title Page'' means, for a printed book, the title page itself,
95130561Sobrienplus such following pages as are needed to hold, legibly, the material
96130561Sobrienthis License requires to appear in the title page.  For works in
97130561Sobrienformats which do not have any title page as such, ``Title Page'' means
98130561Sobrienthe text near the most prominent appearance of the work's title,
99130561Sobrienpreceding the beginning of the body of the text.
100130561Sobrien@sp 1
101130561Sobrien@item
102130561SobrienVERBATIM COPYING
103130561Sobrien
104130561SobrienYou may copy and distribute the Document in any medium, either
105130561Sobriencommercially or noncommercially, provided that this License, the
106130561Sobriencopyright notices, and the license notice saying this License applies
107130561Sobriento the Document are reproduced in all copies, and that you add no other
108130561Sobrienconditions whatsoever to those of this License.  You may not use
109130561Sobrientechnical measures to obstruct or control the reading or further
110130561Sobriencopying of the copies you make or distribute.  However, you may accept
111130561Sobriencompensation in exchange for copies.  If you distribute a large enough
112130561Sobriennumber of copies you must also follow the conditions in section 3.
113130561Sobrien
114130561SobrienYou may also lend copies, under the same conditions stated above, and
115130561Sobrienyou may publicly display copies.
116130561Sobrien@sp 1
117130561Sobrien@item
118130561SobrienCOPYING IN QUANTITY
119130561Sobrien
120130561SobrienIf you publish printed copies of the Document numbering more than 100,
121130561Sobrienand the Document's license notice requires Cover Texts, you must enclose
122130561Sobrienthe copies in covers that carry, clearly and legibly, all these Cover
123130561SobrienTexts: Front-Cover Texts on the front cover, and Back-Cover Texts on
124130561Sobrienthe back cover.  Both covers must also clearly and legibly identify
125130561Sobrienyou as the publisher of these copies.  The front cover must present
126130561Sobrienthe full title with all words of the title equally prominent and
127130561Sobrienvisible.  You may add other material on the covers in addition.
128130561SobrienCopying with changes limited to the covers, as long as they preserve
129130561Sobrienthe title of the Document and satisfy these conditions, can be treated
130130561Sobrienas verbatim copying in other respects.
131130561Sobrien
132130561SobrienIf the required texts for either cover are too voluminous to fit
133130561Sobrienlegibly, you should put the first ones listed (as many as fit
134130561Sobrienreasonably) on the actual cover, and continue the rest onto adjacent
135130561Sobrienpages.
136130561Sobrien
137130561SobrienIf you publish or distribute Opaque copies of the Document numbering
138130561Sobrienmore than 100, you must either include a machine-readable Transparent
139130561Sobriencopy along with each Opaque copy, or state in or with each Opaque copy
140130561Sobriena publicly-accessible computer-network location containing a complete
141130561SobrienTransparent copy of the Document, free of added material, which the
142130561Sobriengeneral network-using public has access to download anonymously at no
143130561Sobriencharge using public-standard network protocols.  If you use the latter
144130561Sobrienoption, you must take reasonably prudent steps, when you begin
145130561Sobriendistribution of Opaque copies in quantity, to ensure that this
146130561SobrienTransparent copy will remain thus accessible at the stated location
147130561Sobrienuntil at least one year after the last time you distribute an Opaque
148130561Sobriencopy (directly or through your agents or retailers) of that edition to
149130561Sobrienthe public.
150130561Sobrien
151130561SobrienIt is requested, but not required, that you contact the authors of the
152130561SobrienDocument well before redistributing any large number of copies, to give
153130561Sobrienthem a chance to provide you with an updated version of the Document.
154130561Sobrien@sp 1
155130561Sobrien@item
156130561SobrienMODIFICATIONS
157130561Sobrien
158130561SobrienYou may copy and distribute a Modified Version of the Document under
159130561Sobrienthe conditions of sections 2 and 3 above, provided that you release
160130561Sobrienthe Modified Version under precisely this License, with the Modified
161130561SobrienVersion filling the role of the Document, thus licensing distribution
162130561Sobrienand modification of the Modified Version to whoever possesses a copy
163130561Sobrienof it.  In addition, you must do these things in the Modified Version:
164130561Sobrien
165130561SobrienA. Use in the Title Page (and on the covers, if any) a title distinct
166130561Sobrien   from that of the Document, and from those of previous versions
167130561Sobrien   (which should, if there were any, be listed in the History section
168130561Sobrien   of the Document).  You may use the same title as a previous version
169130561Sobrien   if the original publisher of that version gives permission.@*
170130561SobrienB. List on the Title Page, as authors, one or more persons or entities
171130561Sobrien   responsible for authorship of the modifications in the Modified
172130561Sobrien   Version, together with at least five of the principal authors of the
173130561Sobrien   Document (all of its principal authors, if it has less than five).@*
174130561SobrienC. State on the Title page the name of the publisher of the
175130561Sobrien   Modified Version, as the publisher.@*
176130561SobrienD. Preserve all the copyright notices of the Document.@*
177130561SobrienE. Add an appropriate copyright notice for your modifications
178130561Sobrien   adjacent to the other copyright notices.@*
179130561SobrienF. Include, immediately after the copyright notices, a license notice
180130561Sobrien   giving the public permission to use the Modified Version under the
181130561Sobrien   terms of this License, in the form shown in the Addendum below.@*
182130561SobrienG. Preserve in that license notice the full lists of Invariant Sections
183130561Sobrien   and required Cover Texts given in the Document's license notice.@*
184130561SobrienH. Include an unaltered copy of this License.@*
185130561SobrienI. Preserve the section entitled ``History'', and its title, and add to
186130561Sobrien   it an item stating at least the title, year, new authors, and
187130561Sobrien   publisher of the Modified Version as given on the Title Page.  If
188130561Sobrien   there is no section entitled ``History'' in the Document, create one
189130561Sobrien   stating the title, year, authors, and publisher of the Document as
190130561Sobrien   given on its Title Page, then add an item describing the Modified
191130561Sobrien   Version as stated in the previous sentence.@*
192130561SobrienJ. Preserve the network location, if any, given in the Document for
193130561Sobrien   public access to a Transparent copy of the Document, and likewise
194130561Sobrien   the network locations given in the Document for previous versions
195130561Sobrien   it was based on.  These may be placed in the ``History'' section.
196130561Sobrien   You may omit a network location for a work that was published at
197130561Sobrien   least four years before the Document itself, or if the original
198130561Sobrien   publisher of the version it refers to gives permission.@*
199130561SobrienK. In any section entitled ``Acknowledgements'' or ``Dedications'',
200130561Sobrien   preserve the section's title, and preserve in the section all the
201130561Sobrien   substance and tone of each of the contributor acknowledgements
202130561Sobrien   and/or dedications given therein.@*
203130561SobrienL. Preserve all the Invariant Sections of the Document,
204130561Sobrien   unaltered in their text and in their titles.  Section numbers
205130561Sobrien   or the equivalent are not considered part of the section titles.@*
206130561SobrienM. Delete any section entitled ``Endorsements.''  Such a section
207130561Sobrien   may not be included in the Modified Version.@*
208130561SobrienN. Do not retitle any existing section as ``Endorsements''
209130561Sobrien   or to conflict in title with any Invariant Section.@*
210130561Sobrien@sp 1
211130561SobrienIf the Modified Version includes new front-matter sections or
212130561Sobrienappendices that qualify as Secondary Sections and contain no material
213130561Sobriencopied from the Document, you may at your option designate some or all
214130561Sobrienof these sections as invariant.  To do this, add their titles to the
215130561Sobrienlist of Invariant Sections in the Modified Version's license notice.
216130561SobrienThese titles must be distinct from any other section titles.
217130561Sobrien
218130561SobrienYou may add a section entitled ``Endorsements'', provided it contains
219130561Sobriennothing but endorsements of your Modified Version by various
220130561Sobrienparties--for example, statements of peer review or that the text has
221130561Sobrienbeen approved by an organization as the authoritative definition of a
222130561Sobrienstandard.
223130561Sobrien
224130561SobrienYou may add a passage of up to five words as a Front-Cover Text, and a
225130561Sobrienpassage of up to 25 words as a Back-Cover Text, to the end of the list
226130561Sobrienof Cover Texts in the Modified Version.  Only one passage of
227130561SobrienFront-Cover Text and one of Back-Cover Text may be added by (or
228130561Sobrienthrough arrangements made by) any one entity.  If the Document already
229130561Sobrienincludes a cover text for the same cover, previously added by you or
230130561Sobrienby arrangement made by the same entity you are acting on behalf of,
231130561Sobrienyou may not add another; but you may replace the old one, on explicit
232130561Sobrienpermission from the previous publisher that added the old one.
233130561Sobrien
234130561SobrienThe author(s) and publisher(s) of the Document do not by this License
235130561Sobriengive permission to use their names for publicity for or to assert or
236130561Sobrienimply endorsement of any Modified Version.
237130561Sobrien@sp 1
238130561Sobrien@item
239130561SobrienCOMBINING DOCUMENTS
240130561Sobrien
241130561SobrienYou may combine the Document with other documents released under this
242130561SobrienLicense, under the terms defined in section 4 above for modified
243130561Sobrienversions, provided that you include in the combination all of the
244130561SobrienInvariant Sections of all of the original documents, unmodified, and
245130561Sobrienlist them all as Invariant Sections of your combined work in its
246130561Sobrienlicense notice.
247130561Sobrien
248130561SobrienThe combined work need only contain one copy of this License, and
249130561Sobrienmultiple identical Invariant Sections may be replaced with a single
250130561Sobriencopy.  If there are multiple Invariant Sections with the same name but
251130561Sobriendifferent contents, make the title of each such section unique by
252130561Sobrienadding at the end of it, in parentheses, the name of the original
253130561Sobrienauthor or publisher of that section if known, or else a unique number.
254130561SobrienMake the same adjustment to the section titles in the list of
255130561SobrienInvariant Sections in the license notice of the combined work.
256130561Sobrien
257130561SobrienIn the combination, you must combine any sections entitled ``History''
258130561Sobrienin the various original documents, forming one section entitled
259130561Sobrien``History''; likewise combine any sections entitled ``Acknowledgements'',
260130561Sobrienand any sections entitled ``Dedications.''  You must delete all sections
261130561Sobrienentitled ``Endorsements.''
262130561Sobrien@sp 1
263130561Sobrien@item
264130561SobrienCOLLECTIONS OF DOCUMENTS
265130561Sobrien
266130561SobrienYou may make a collection consisting of the Document and other documents
267130561Sobrienreleased under this License, and replace the individual copies of this
268130561SobrienLicense in the various documents with a single copy that is included in
269130561Sobrienthe collection, provided that you follow the rules of this License for
270130561Sobrienverbatim copying of each of the documents in all other respects.
271130561Sobrien
272130561SobrienYou may extract a single document from such a collection, and distribute
273130561Sobrienit individually under this License, provided you insert a copy of this
274130561SobrienLicense into the extracted document, and follow this License in all
275130561Sobrienother respects regarding verbatim copying of that document.
276130561Sobrien@sp 1
277130561Sobrien@item
278130561SobrienAGGREGATION WITH INDEPENDENT WORKS
279130561Sobrien
280130561SobrienA compilation of the Document or its derivatives with other separate
281130561Sobrienand independent documents or works, in or on a volume of a storage or
282130561Sobriendistribution medium, does not as a whole count as a Modified Version
283130561Sobrienof the Document, provided no compilation copyright is claimed for the
284130561Sobriencompilation.  Such a compilation is called an ``aggregate'', and this
285130561SobrienLicense does not apply to the other self-contained works thus compiled
286130561Sobrienwith the Document, on account of their being thus compiled, if they
287130561Sobrienare not themselves derivative works of the Document.
288130561Sobrien
289130561SobrienIf the Cover Text requirement of section 3 is applicable to these
290130561Sobriencopies of the Document, then if the Document is less than one quarter
291130561Sobrienof the entire aggregate, the Document's Cover Texts may be placed on
292130561Sobriencovers that surround only the Document within the aggregate.
293130561SobrienOtherwise they must appear on covers around the whole aggregate.
294130561Sobrien@sp 1
295130561Sobrien@item
296130561SobrienTRANSLATION
297130561Sobrien
298130561SobrienTranslation is considered a kind of modification, so you may
299130561Sobriendistribute translations of the Document under the terms of section 4.
300130561SobrienReplacing Invariant Sections with translations requires special
301130561Sobrienpermission from their copyright holders, but you may include
302130561Sobrientranslations of some or all Invariant Sections in addition to the
303130561Sobrienoriginal versions of these Invariant Sections.  You may include a
304130561Sobrientranslation of this License provided that you also include the
305130561Sobrienoriginal English version of this License.  In case of a disagreement
306130561Sobrienbetween the translation and the original English version of this
307130561SobrienLicense, the original English version will prevail.
308130561Sobrien@sp 1
309130561Sobrien@item
310130561SobrienTERMINATION
311130561Sobrien
312130561SobrienYou may not copy, modify, sublicense, or distribute the Document except
313130561Sobrienas expressly provided for under this License.  Any other attempt to
314130561Sobriencopy, modify, sublicense or distribute the Document is void, and will
315130561Sobrienautomatically terminate your rights under this License.  However,
316130561Sobrienparties who have received copies, or rights, from you under this
317130561SobrienLicense will not have their licenses terminated so long as such
318130561Sobrienparties remain in full compliance.
319130561Sobrien@sp 1
320130561Sobrien@item
321130561SobrienFUTURE REVISIONS OF THIS LICENSE
322130561Sobrien
323130561SobrienThe Free Software Foundation may publish new, revised versions
324130561Sobrienof the GNU Free Documentation License from time to time.  Such new
325130561Sobrienversions will be similar in spirit to the present version, but may
326130561Sobriendiffer in detail to address new problems or concerns.  See
327130561Sobrienhttp://www.gnu.org/copyleft/.
328130561Sobrien
329130561SobrienEach version of the License is given a distinguishing version number.
330130561SobrienIf the Document specifies that a particular numbered version of this
331130561SobrienLicense ``or any later version'' applies to it, you have the option of
332130561Sobrienfollowing the terms and conditions either of that specified version or
333130561Sobrienof any later version that has been published (not as a draft) by the
334130561SobrienFree Software Foundation.  If the Document does not specify a version
335130561Sobriennumber of this License, you may choose any version ever published (not
336130561Sobrienas a draft) by the Free Software Foundation.
337130561Sobrien
338130561Sobrien@end enumerate
339130561Sobrien
340130561Sobrien@unnumberedsec ADDENDUM: How to use this License for your documents
341130561Sobrien
342130561SobrienTo use this License in a document you have written, include a copy of
343130561Sobrienthe License in the document and put the following copyright and
344130561Sobrienlicense notices just after the title page:
345130561Sobrien
346130561Sobrien@smallexample
347130561Sobrien@group
348130561SobrienCopyright (C)  @var{year}  @var{your name}.
349130561SobrienPermission is granted to copy, distribute and/or modify this document
350130561Sobrienunder the terms of the GNU Free Documentation License, Version 1.1
351130561Sobrienor any later version published by the Free Software Foundation;
352130561Sobrienwith the Invariant Sections being @var{list their titles}, with the
353130561SobrienFront-Cover Texts being @var{list}, and with the Back-Cover Texts being @var{list}.
354130561SobrienA copy of the license is included in the section entitled "GNU
355130561SobrienFree Documentation License."
356130561Sobrien@end group
357130561Sobrien@end smallexample
358130561Sobrien
359130561SobrienIf you have no Invariant Sections, write ``with no Invariant Sections''
360130561Sobrieninstead of saying which ones are invariant.  If you have no
361130561SobrienFront-Cover Texts, write ``no Front-Cover Texts'' instead of
362130561Sobrien``Front-Cover Texts being @var{list}''; likewise for Back-Cover Texts.
363130561Sobrien
364130561SobrienIf your document contains nontrivial examples of program code, we
365130561Sobrienrecommend releasing these examples in parallel under your choice of
366130561Sobrienfree software license, such as the GNU General Public License,
367130561Sobriento permit their use in free software.
368