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1 @c The GNU Free Documentation License.
2 @center Version 1.3, 3 November 2008
3
4 @c This file is intended to be included within another document,
5 @c hence no sectioning command or @node.
6
7 @display
8 Copyright @copyright{} 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
9 @uref{http://fsf.org/}
10
11 Everyone is permitted to copy and distribute verbatim copies
12 of this license document, but changing it is not allowed.
13 @end display
14
15 @enumerate 0
16 @item
17 PREAMBLE
18
19 The purpose of this License is to make a manual, textbook, or other
20 functional and useful document @dfn{free} in the sense of freedom: to
21 assure everyone the effective freedom to copy and redistribute it,
22 with or without modifying it, either commercially or noncommercially.
23 Secondarily, this License preserves for the author and publisher a way
24 to get credit for their work, while not being considered responsible
25 for modifications made by others.
26
27 This License is a kind of ``copyleft'', which means that derivative
28 works of the document must themselves be free in the same sense. It
29 complements the GNU General Public License, which is a copyleft
30 license designed for free software.
31
32 We have designed this License in order to use it for manuals for free
33 software, because free software needs free documentation: a free
34 program should come with manuals providing the same freedoms that the
35 software does. But this License is not limited to software manuals;
36 it can be used for any textual work, regardless of subject matter or
37 whether it is published as a printed book. We recommend this License
38 principally for works whose purpose is instruction or reference.
39
40 @item
41 APPLICABILITY AND DEFINITIONS
42
43 This License applies to any manual or other work, in any medium, that
44 contains a notice placed by the copyright holder saying it can be
45 distributed under the terms of this License. Such a notice grants a
46 world-wide, royalty-free license, unlimited in duration, to use that
47 work under the conditions stated herein. The ``Document'', below,
48 refers to any such manual or work. Any member of the public is a
49 licensee, and is addressed as ``you''. You accept the license if you
50 copy, modify or distribute the work in a way requiring permission
51 under copyright law.
52
53 A ``Modified Version'' of the Document means any work containing the
54 Document or a portion of it, either copied verbatim, or with
55 modifications and/or translated into another language.
56
57 A ``Secondary Section'' is a named appendix or a front-matter section
58 of the Document that deals exclusively with the relationship of the
59 publishers or authors of the Document to the Document's overall
60 subject (or to related matters) and contains nothing that could fall
61 directly within that overall subject. (Thus, if the Document is in
62 part a textbook of mathematics, a Secondary Section may not explain
63 any mathematics.) The relationship could be a matter of historical
64 connection with the subject or with related matters, or of legal,
65 commercial, philosophical, ethical or political position regarding
66 them.
67
68 The ``Invariant Sections'' are certain Secondary Sections whose titles
69 are designated, as being those of Invariant Sections, in the notice
70 that says that the Document is released under this License. If a
71 section does not fit the above definition of Secondary then it is not
72 allowed to be designated as Invariant. The Document may contain zero
73 Invariant Sections. If the Document does not identify any Invariant
74 Sections then there are none.
75
76 The ``Cover Texts'' are certain short passages of text that are listed,
77 as Front-Cover Texts or Back-Cover Texts, in the notice that says that
78 the Document is released under this License. A Front-Cover Text may
79 be at most 5 words, and a Back-Cover Text may be at most 25 words.
80
81 A ``Transparent'' copy of the Document means a machine-readable copy,
82 represented in a format whose specification is available to the
83 general public, that is suitable for revising the document
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86 drawing editor, and that is suitable for input to text formatters or
87 for automatic translation to a variety of formats suitable for input
88 to text formatters. A copy made in an otherwise Transparent file
89 format whose markup, or absence of markup, has been arranged to thwart
90 or discourage subsequent modification by readers is not Transparent.
91 An image format is not Transparent if used for any substantial amount
92 of text. A copy that is not ``Transparent'' is called ``Opaque''.
93
94 Examples of suitable formats for Transparent copies include plain
95 @sc{ascii} without markup, Texinfo input format, La@TeX{} input
96 format, @acronym{SGML} or @acronym{XML} using a publicly available
97 @acronym{DTD}, and standard-conforming simple @acronym{HTML},
98 PostScript or @acronym{PDF} designed for human modification. Examples
99 of transparent image formats include @acronym{PNG}, @acronym{XCF} and
100 @acronym{JPG}. Opaque formats include proprietary formats that can be
101 read and edited only by proprietary word processors, @acronym{SGML} or
102 @acronym{XML} for which the @acronym{DTD} and/or processing tools are
103 not generally available, and the machine-generated @acronym{HTML},
104 PostScript or @acronym{PDF} produced by some word processors for
105 output purposes only.
106
107 The ``Title Page'' means, for a printed book, the title page itself,
108 plus such following pages as are needed to hold, legibly, the material
109 this License requires to appear in the title page. For works in
110 formats which do not have any title page as such, ``Title Page'' means
111 the text near the most prominent appearance of the work's title,
112 preceding the beginning of the body of the text.
113
114 The ``publisher'' means any person or entity that distributes copies
115 of the Document to the public.
116
117 A section ``Entitled XYZ'' means a named subunit of the Document whose
118 title either is precisely XYZ or contains XYZ in parentheses following
119 text that translates XYZ in another language. (Here XYZ stands for a
120 specific section name mentioned below, such as ``Acknowledgements'',
121 ``Dedications'', ``Endorsements'', or ``History''.) To ``Preserve the Title''
122 of such a section when you modify the Document means that it remains a
123 section ``Entitled XYZ'' according to this definition.
124
125 The Document may include Warranty Disclaimers next to the notice which
126 states that this License applies to the Document. These Warranty
127 Disclaimers are considered to be included by reference in this
128 License, but only as regards disclaiming warranties: any other
129 implication that these Warranty Disclaimers may have is void and has
130 no effect on the meaning of this License.
131
132 @item
133 VERBATIM COPYING
134
135 You may copy and distribute the Document in any medium, either
136 commercially or noncommercially, provided that this License, the
137 copyright notices, and the license notice saying this License applies
138 to the Document are reproduced in all copies, and that you add no other
139 conditions whatsoever to those of this License. You may not use
140 technical measures to obstruct or control the reading or further
141 copying of the copies you make or distribute. However, you may accept
142 compensation in exchange for copies. If you distribute a large enough
143 number of copies you must also follow the conditions in section 3.
144
145 You may also lend copies, under the same conditions stated above, and
146 you may publicly display copies.
147
148 @item
149 COPYING IN QUANTITY
150
151 If you publish printed copies (or copies in media that commonly have
152 printed covers) of the Document, numbering more than 100, and the
153 Document's license notice requires Cover Texts, you must enclose the
154 copies in covers that carry, clearly and legibly, all these Cover
155 Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on
156 the back cover. Both covers must also clearly and legibly identify
157 you as the publisher of these copies. The front cover must present
158 the full title with all words of the title equally prominent and
159 visible. You may add other material on the covers in addition.
160 Copying with changes limited to the covers, as long as they preserve
161 the title of the Document and satisfy these conditions, can be treated
162 as verbatim copying in other respects.
163
164 If the required texts for either cover are too voluminous to fit
165 legibly, you should put the first ones listed (as many as fit
166 reasonably) on the actual cover, and continue the rest onto adjacent
167 pages.
168
169 If you publish or distribute Opaque copies of the Document numbering
170 more than 100, you must either include a machine-readable Transparent
171 copy along with each Opaque copy, or state in or with each Opaque copy
172 a computer-network location from which the general network-using
173 public has access to download using public-standard network protocols
174 a complete Transparent copy of the Document, free of added material.
175 If you use the latter option, you must take reasonably prudent steps,
176 when you begin distribution of Opaque copies in quantity, to ensure
177 that this Transparent copy will remain thus accessible at the stated
178 location until at least one year after the last time you distribute an
179 Opaque copy (directly or through your agents or retailers) of that
180 edition to the public.
181
182 It is requested, but not required, that you contact the authors of the
183 Document well before redistributing any large number of copies, to give
184 them a chance to provide you with an updated version of the Document.
185
186 @item
187 MODIFICATIONS
188
189 You may copy and distribute a Modified Version of the Document under
190 the conditions of sections 2 and 3 above, provided that you release
191 the Modified Version under precisely this License, with the Modified
192 Version filling the role of the Document, thus licensing distribution
193 and modification of the Modified Version to whoever possesses a copy
194 of it. In addition, you must do these things in the Modified Version:
195
196 @enumerate A
197 @item
198 Use in the Title Page (and on the covers, if any) a title distinct
199 from that of the Document, and from those of previous versions
200 (which should, if there were any, be listed in the History section
201 of the Document). You may use the same title as a previous version
202 if the original publisher of that version gives permission.
203
204 @item
205 List on the Title Page, as authors, one or more persons or entities
206 responsible for authorship of the modifications in the Modified
207 Version, together with at least five of the principal authors of the
208 Document (all of its principal authors, if it has fewer than five),
209 unless they release you from this requirement.
210
211 @item
212 State on the Title page the name of the publisher of the
213 Modified Version, as the publisher.
214
215 @item
216 Preserve all the copyright notices of the Document.
217
218 @item
219 Add an appropriate copyright notice for your modifications
220 adjacent to the other copyright notices.
221
222 @item
223 Include, immediately after the copyright notices, a license notice
224 giving the public permission to use the Modified Version under the
225 terms of this License, in the form shown in the Addendum below.
226
227 @item
228 Preserve in that license notice the full lists of Invariant Sections
229 and required Cover Texts given in the Document's license notice.
230
231 @item
232 Include an unaltered copy of this License.
233
234 @item
235 Preserve the section Entitled ``History'', Preserve its Title, and add
236 to it an item stating at least the title, year, new authors, and
237 publisher of the Modified Version as given on the Title Page. If
238 there is no section Entitled ``History'' in the Document, create one
239 stating the title, year, authors, and publisher of the Document as
240 given on its Title Page, then add an item describing the Modified
241 Version as stated in the previous sentence.
242
243 @item
244 Preserve the network location, if any, given in the Document for
245 public access to a Transparent copy of the Document, and likewise
246 the network locations given in the Document for previous versions
247 it was based on. These may be placed in the ``History'' section.
248 You may omit a network location for a work that was published at
249 least four years before the Document itself, or if the original
250 publisher of the version it refers to gives permission.
251
252 @item
253 For any section Entitled ``Acknowledgements'' or ``Dedications'', Preserve
254 the Title of the section, and preserve in the section all the
255 substance and tone of each of the contributor acknowledgements and/or
256 dedications given therein.
257
258 @item
259 Preserve all the Invariant Sections of the Document,
260 unaltered in their text and in their titles. Section numbers
261 or the equivalent are not considered part of the section titles.
262
263 @item
264 Delete any section Entitled ``Endorsements''. Such a section
265 may not be included in the Modified Version.
266
267 @item
268 Do not retitle any existing section to be Entitled ``Endorsements'' or
269 to conflict in title with any Invariant Section.
270
271 @item
272 Preserve any Warranty Disclaimers.
273 @end enumerate
274
275 If the Modified Version includes new front-matter sections or
276 appendices that qualify as Secondary Sections and contain no material
277 copied from the Document, you may at your option designate some or all
278 of these sections as invariant. To do this, add their titles to the
279 list of Invariant Sections in the Modified Version's license notice.
280 These titles must be distinct from any other section titles.
281
282 You may add a section Entitled ``Endorsements'', provided it contains
283 nothing but endorsements of your Modified Version by various
284 parties---for example, statements of peer review or that the text has
285 been approved by an organization as the authoritative definition of a
286 standard.
287
288 You may add a passage of up to five words as a Front-Cover Text, and a
289 passage of up to 25 words as a Back-Cover Text, to the end of the list
290 of Cover Texts in the Modified Version. Only one passage of
291 Front-Cover Text and one of Back-Cover Text may be added by (or
292 through arrangements made by) any one entity. If the Document already
293 includes a cover text for the same cover, previously added by you or
294 by arrangement made by the same entity you are acting on behalf of,
295 you may not add another; but you may replace the old one, on explicit
296 permission from the previous publisher that added the old one.
297
298 The author(s) and publisher(s) of the Document do not by this License
299 give permission to use their names for publicity for or to assert or
300 imply endorsement of any Modified Version.
301
302 @item
303 COMBINING DOCUMENTS
304
305 You may combine the Document with other documents released under this
306 License, under the terms defined in section 4 above for modified
307 versions, provided that you include in the combination all of the
308 Invariant Sections of all of the original documents, unmodified, and
309 list them all as Invariant Sections of your combined work in its
310 license notice, and that you preserve all their Warranty Disclaimers.
311
312 The combined work need only contain one copy of this License, and
313 multiple identical Invariant Sections may be replaced with a single
314 copy. If there are multiple Invariant Sections with the same name but
315 different contents, make the title of each such section unique by
316 adding at the end of it, in parentheses, the name of the original
317 author or publisher of that section if known, or else a unique number.
318 Make the same adjustment to the section titles in the list of
319 Invariant Sections in the license notice of the combined work.
320
321 In the combination, you must combine any sections Entitled ``History''
322 in the various original documents, forming one section Entitled
323 ``History''; likewise combine any sections Entitled ``Acknowledgements'',
324 and any sections Entitled ``Dedications''. You must delete all
325 sections Entitled ``Endorsements.''
326
327 @item
328 COLLECTIONS OF DOCUMENTS
329
330 You may make a collection consisting of the Document and other documents
331 released under this License, and replace the individual copies of this
332 License in the various documents with a single copy that is included in
333 the collection, provided that you follow the rules of this License for
334 verbatim copying of each of the documents in all other respects.
335
336 You may extract a single document from such a collection, and distribute
337 it individually under this License, provided you insert a copy of this
338 License into the extracted document, and follow this License in all
339 other respects regarding verbatim copying of that document.
340
341 @item
342 AGGREGATION WITH INDEPENDENT WORKS
343
344 A compilation of the Document or its derivatives with other separate
345 and independent documents or works, in or on a volume of a storage or
346 distribution medium, is called an ``aggregate'' if the copyright
347 resulting from the compilation is not used to limit the legal rights
348 of the compilation's users beyond what the individual works permit.
349 When the Document is included in an aggregate, this License does not
350 apply to the other works in the aggregate which are not themselves
351 derivative works of the Document.
352
353 If the Cover Text requirement of section 3 is applicable to these
354 copies of the Document, then if the Document is less than one half of
355 the entire aggregate, the Document's Cover Texts may be placed on
356 covers that bracket the Document within the aggregate, or the
357 electronic equivalent of covers if the Document is in electronic form.
358 Otherwise they must appear on printed covers that bracket the whole
359 aggregate.
360
361 @item
362 TRANSLATION
363
364 Translation is considered a kind of modification, so you may
365 distribute translations of the Document under the terms of section 4.
366 Replacing Invariant Sections with translations requires special
367 permission from their copyright holders, but you may include
368 translations of some or all Invariant Sections in addition to the
369 original versions of these Invariant Sections. You may include a
370 translation of this License, and all the license notices in the
371 Document, and any Warranty Disclaimers, provided that you also include
372 the original English version of this License and the original versions
373 of those notices and disclaimers. In case of a disagreement between
374 the translation and the original version of this License or a notice
375 or disclaimer, the original version will prevail.
376
377 If a section in the Document is Entitled ``Acknowledgements'',
378 ``Dedications'', or ``History'', the requirement (section 4) to Preserve
379 its Title (section 1) will typically require changing the actual
380 title.
381
382 @item
383 TERMINATION
384
385 You may not copy, modify, sublicense, or distribute the Document
386 except as expressly provided under this License. Any attempt
387 otherwise to copy, modify, sublicense, or distribute it is void, and
388 will automatically terminate your rights under this License.
389
390 However, if you cease all violation of this License, then your license
391 from a particular copyright holder is reinstated (a) provisionally,
392 unless and until the copyright holder explicitly and finally
393 terminates your license, and (b) permanently, if the copyright holder
394 fails to notify you of the violation by some reasonable means prior to
395 60 days after the cessation.
396
397 Moreover, your license from a particular copyright holder is
398 reinstated permanently if the copyright holder notifies you of the
399 violation by some reasonable means, this is the first time you have
400 received notice of violation of this License (for any work) from that
401 copyright holder, and you cure the violation prior to 30 days after
402 your receipt of the notice.
403
404 Termination of your rights under this section does not terminate the
405 licenses of parties who have received copies or rights from you under
406 this License. If your rights have been terminated and not permanently
407 reinstated, receipt of a copy of some or all of the same material does
408 not give you any rights to use it.
409
410 @item
411 FUTURE REVISIONS OF THIS LICENSE
412
413 The Free Software Foundation may publish new, revised versions
414 of the GNU Free Documentation License from time to time. Such new
415 versions will be similar in spirit to the present version, but may
416 differ in detail to address new problems or concerns. See
417 @uref{http://www.gnu.org/copyleft/}.
418
419 Each version of the License is given a distinguishing version number.
420 If the Document specifies that a particular numbered version of this
421 License ``or any later version'' applies to it, you have the option of
422 following the terms and conditions either of that specified version or
423 of any later version that has been published (not as a draft) by the
424 Free Software Foundation. If the Document does not specify a version
425 number of this License, you may choose any version ever published (not
426 as a draft) by the Free Software Foundation. If the Document
427 specifies that a proxy can decide which future versions of this
428 License can be used, that proxy's public statement of acceptance of a
429 version permanently authorizes you to choose that version for the
430 Document.
431
432 @item
433 RELICENSING
434
435 ``Massive Multiauthor Collaboration Site'' (or ``MMC Site'') means any
436 World Wide Web server that publishes copyrightable works and also
437 provides prominent facilities for anybody to edit those works. A
438 public wiki that anybody can edit is an example of such a server. A
439 ``Massive Multiauthor Collaboration'' (or ``MMC'') contained in the
440 site means any set of copyrightable works thus published on the MMC
441 site.
442
443 ``CC-BY-SA'' means the Creative Commons Attribution-Share Alike 3.0
444 license published by Creative Commons Corporation, a not-for-profit
445 corporation with a principal place of business in San Francisco,
446 California, as well as future copyleft versions of that license
447 published by that same organization.
448
449 ``Incorporate'' means to publish or republish a Document, in whole or
450 in part, as part of another Document.
451
452 An MMC is ``eligible for relicensing'' if it is licensed under this
453 License, and if all works that were first published under this License
454 somewhere other than this MMC, and subsequently incorporated in whole
455 or in part into the MMC, (1) had no cover texts or invariant sections,
456 and (2) were thus incorporated prior to November 1, 2008.
457
458 The operator of an MMC Site may republish an MMC contained in the site
459 under CC-BY-SA on the same site at any time before August 1, 2009,
460 provided the MMC is eligible for relicensing.
461
462 @end enumerate
463
464 @page
465 @heading ADDENDUM: How to use this License for your documents
466
467 To use this License in a document you have written, include a copy of
468 the License in the document and put the following copyright and
469 license notices just after the title page:
470
471 @smallexample
472 @group
473 Copyright (C) @var{year} @var{your name}.
474 Permission is granted to copy, distribute and/or modify this document
475 under the terms of the GNU Free Documentation License, Version 1.3
476 or any later version published by the Free Software Foundation;
477 with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
478 Texts. A copy of the license is included in the section entitled ``GNU
479 Free Documentation License''.
480 @end group
481 @end smallexample
482
483 If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
484 replace the ``with@dots{}Texts.'' line with this:
485
486 @smallexample
487 @group
488 with the Invariant Sections being @var{list their titles}, with
489 the Front-Cover Texts being @var{list}, and with the Back-Cover Texts
490 being @var{list}.
491 @end group
492 @end smallexample
493
494 If you have Invariant Sections without Cover Texts, or some other
495 combination of the three, merge those two alternatives to suit the
496 situation.
497
498 If your document contains nontrivial examples of program code, we
499 recommend releasing these examples in parallel under your choice of
500 free software license, such as the GNU General Public License,
501 to permit their use in free software.
502
503 @c Local Variables:
504 @c ispell-local-pdict: "ispell-dict"
505 @c End:
506