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1 | .. -*- coding: utf-8; mode: rst -*- |
2 | ||
3 | .. _fdl: | |
4 | ||
5 | ****************************** | |
6 | GNU Free Documentation License | |
7 | ****************************** | |
8 | ||
9 | ||
10 | .. _fdl-preamble: | |
11 | ||
12 | 0. PREAMBLE | |
13 | =========== | |
14 | ||
15 | The purpose of this License is to make a manual, textbook, or other | |
16 | written document “free” in the sense of freedom: to assure everyone the | |
17 | effective freedom to copy and redistribute it, with or without modifying | |
18 | it, either commercially or noncommercially. Secondarily, this License | |
19 | preserves for the author and publisher a way to get credit for their | |
20 | work, while not being considered responsible for modifications made by | |
21 | others. | |
22 | ||
23 | This License is a kind of “copyleft”, which means that derivative works | |
24 | of the document must themselves be free in the same sense. It | |
25 | complements the GNU General Public License, which is a copyleft license | |
26 | designed for free software. | |
27 | ||
28 | We have designed this License in order to use it for manuals for free | |
29 | software, because free software needs free documentation: a free program | |
30 | should come with manuals providing the same freedoms that the software | |
31 | does. But this License is not limited to software manuals; it can be | |
32 | used for any textual work, regardless of subject matter or whether it is | |
33 | published as a printed book. We recommend this License principally for | |
34 | works whose purpose is instruction or reference. | |
35 | ||
36 | ||
37 | .. _fdl-section1: | |
38 | ||
39 | 1. APPLICABILITY AND DEFINITIONS | |
40 | ================================ | |
41 | ||
42 | ||
43 | .. _fdl-document: | |
e4aadf72 | 44 | |
5377d91f MH |
45 | This License applies to any manual or other work that contains a notice |
46 | placed by the copyright holder saying it can be distributed under the | |
47 | terms of this License. The “Document”, below, refers to any such manual | |
48 | or work. Any member of the public is a licensee, and is addressed as | |
49 | “you”. | |
50 | ||
51 | ||
52 | .. _fdl-modified: | |
e4aadf72 | 53 | |
5377d91f MH |
54 | A “Modified Version” of the Document means any work containing the |
55 | Document or a portion of it, either copied verbatim, or with | |
56 | modifications and/or translated into another language. | |
57 | ||
58 | ||
59 | .. _fdl-secondary: | |
e4aadf72 | 60 | |
5377d91f MH |
61 | A “Secondary Section” is a named appendix or a front-matter section of |
62 | the :ref:`Document <fdl-document>` that deals exclusively with the | |
63 | relationship of the publishers or authors of the Document to the | |
64 | Document's overall subject (or to related matters) and contains nothing | |
65 | that could fall directly within that overall subject. (For example, if | |
66 | the Document is in part a textbook of mathematics, a Secondary Section | |
67 | may not explain any mathematics.) The relationship could be a matter of | |
68 | historical connection with the subject or with related matters, or of | |
69 | legal, commercial, philosophical, ethical or political position | |
70 | regarding them. | |
71 | ||
72 | ||
73 | .. _fdl-invariant: | |
e4aadf72 | 74 | |
5377d91f MH |
75 | The “Invariant Sections” are certain |
76 | :ref:`Secondary Sections <fdl-secondary>` whose titles are designated, | |
77 | as being those of Invariant Sections, in the notice that says that the | |
78 | :ref:`Document <fdl-document>` is released under this License. | |
79 | ||
80 | ||
81 | .. _fdl-cover-texts: | |
e4aadf72 | 82 | |
5377d91f MH |
83 | The “Cover Texts” are certain short passages of text that are listed, as |
84 | Front-Cover Texts or Back-Cover Texts, in the notice that says that the | |
85 | :ref:`Document <fdl-document>` is released under this License. | |
86 | ||
87 | ||
88 | .. _fdl-transparent: | |
e4aadf72 | 89 | |
5377d91f MH |
90 | A “Transparent” copy of the :ref:`Document <fdl-document>` means a |
91 | machine-readable copy, represented in a format whose specification is | |
92 | available to the general public, whose contents can be viewed and edited | |
93 | directly and straightforwardly with generic text editors or (for images | |
94 | composed of pixels) generic paint programs or (for drawings) some widely | |
95 | available drawing editor, and that is suitable for input to text | |
96 | formatters or for automatic translation to a variety of formats suitable | |
97 | for input to text formatters. A copy made in an otherwise Transparent | |
98 | file format whose markup has been designed to thwart or discourage | |
99 | subsequent modification by readers is not Transparent. A copy that is | |
100 | not “Transparent” is called “Opaque”. | |
101 | ||
102 | Examples of suitable formats for Transparent copies include plain ASCII | |
103 | without markup, Texinfo input format, LaTeX input format, SGML or XML | |
104 | using a publicly available DTD, and standard-conforming simple HTML | |
105 | designed for human modification. Opaque formats include PostScript, PDF, | |
106 | proprietary formats that can be read and edited only by proprietary word | |
107 | processors, SGML or XML for which the DTD and/or processing tools are | |
108 | not generally available, and the machine-generated HTML produced by some | |
109 | word processors for output purposes only. | |
110 | ||
111 | ||
112 | .. _fdl-title-page: | |
e4aadf72 | 113 | |
5377d91f MH |
114 | The “Title Page” means, for a printed book, the title page itself, plus |
115 | such following pages as are needed to hold, legibly, the material this | |
116 | License requires to appear in the title page. For works in formats which | |
117 | do not have any title page as such, “Title Page” means the text near the | |
118 | most prominent appearance of the work's title, preceding the beginning | |
119 | of the body of the text. | |
120 | ||
121 | ||
122 | .. _fdl-section2: | |
123 | ||
124 | 2. VERBATIM COPYING | |
125 | =================== | |
126 | ||
127 | You may copy and distribute the :ref:`Document <fdl-document>` in any | |
128 | medium, either commercially or noncommercially, provided that this | |
129 | License, the copyright notices, and the license notice saying this | |
130 | License applies to the Document are reproduced in all copies, and that | |
131 | you add no other conditions whatsoever to those of this License. You may | |
132 | not use technical measures to obstruct or control the reading or further | |
133 | copying of the copies you make or distribute. However, you may accept | |
134 | compensation in exchange for copies. If you distribute a large enough | |
135 | number of copies you must also follow the conditions in | |
136 | :ref:`section 3 <fdl-section3>`. | |
137 | ||
138 | You may also lend copies, under the same conditions stated above, and | |
139 | you may publicly display copies. | |
140 | ||
141 | ||
142 | .. _fdl-section3: | |
143 | ||
144 | 3. COPYING IN QUANTITY | |
145 | ====================== | |
146 | ||
147 | If you publish printed copies of the :ref:`Document <fdl-document>` | |
148 | numbering more than 100, and the Document's license notice requires | |
149 | :ref:`Cover Texts <fdl-cover-texts>`, you must enclose the copies in | |
150 | covers that carry, clearly and legibly, all these Cover Texts: | |
151 | Front-Cover Texts on the front cover, and Back-Cover Texts on the back | |
152 | cover. Both covers must also clearly and legibly identify you as the | |
153 | publisher of these copies. The front cover must present the full title | |
154 | with all words of the title equally prominent and visible. You may add | |
155 | other material on the covers in addition. Copying with changes limited | |
156 | to the covers, as long as they preserve the title of the | |
157 | :ref:`Document <fdl-document>` and satisfy these conditions, can be | |
158 | treated as verbatim copying in other respects. | |
159 | ||
160 | If the required texts for either cover are too voluminous to fit | |
161 | legibly, you should put the first ones listed (as many as fit | |
162 | reasonably) on the actual cover, and continue the rest onto adjacent | |
163 | pages. | |
164 | ||
165 | If you publish or distribute :ref:`Opaque <fdl-transparent>` copies of | |
166 | the :ref:`Document <fdl-document>` numbering more than 100, you must | |
167 | either include a machine-readable :ref:`Transparent <fdl-transparent>` | |
168 | copy along with each Opaque copy, or state in or with each Opaque copy a | |
169 | publicly-accessible computer-network location containing a complete | |
170 | Transparent copy of the Document, free of added material, which the | |
171 | general network-using public has access to download anonymously at no | |
172 | charge using public-standard network protocols. If you use the latter | |
173 | option, you must take reasonably prudent steps, when you begin | |
174 | distribution of Opaque copies in quantity, to ensure that this | |
175 | Transparent copy will remain thus accessible at the stated location | |
176 | until at least one year after the last time you distribute an Opaque | |
177 | copy (directly or through your agents or retailers) of that edition to | |
178 | the public. | |
179 | ||
180 | It is requested, but not required, that you contact the authors of the | |
181 | :ref:`Document <fdl-document>` well before redistributing any large | |
182 | number of copies, to give them a chance to provide you with an updated | |
183 | version of the Document. | |
184 | ||
185 | ||
186 | .. _fdl-section4: | |
187 | ||
188 | 4. MODIFICATIONS | |
189 | ================ | |
190 | ||
191 | You may copy and distribute a :ref:`Modified Version <fdl-modified>` | |
192 | of the :ref:`Document <fdl-document>` under the conditions of sections | |
193 | :ref:`2 <fdl-section2>` and :ref:`3 <fdl-section3>` above, provided | |
194 | that you release the Modified Version under precisely this License, with | |
195 | the Modified Version filling the role of the Document, thus licensing | |
196 | distribution and modification of the Modified Version to whoever | |
197 | possesses a copy of it. In addition, you must do these things in the | |
198 | Modified Version: | |
199 | ||
200 | - **A.** | |
5377d91f MH |
201 | Use in the :ref:`Title Page <fdl-title-page>` (and on the covers, |
202 | if any) a title distinct from that of the | |
203 | :ref:`Document <fdl-document>`, and from those of previous versions | |
204 | (which should, if there were any, be listed in the History section of | |
205 | the Document). You may use the same title as a previous version if | |
206 | the original publisher of that version gives permission. | |
207 | ||
208 | - **B.** | |
5377d91f MH |
209 | List on the :ref:`Title Page <fdl-title-page>`, as authors, one or |
210 | more persons or entities responsible for authorship of the | |
211 | modifications in the :ref:`Modified Version <fdl-modified>`, | |
212 | together with at least five of the principal authors of the | |
213 | :ref:`Document <fdl-document>` (all of its principal authors, if it | |
214 | has less than five). | |
215 | ||
216 | - **C.** | |
5377d91f MH |
217 | State on the :ref:`Title Page <fdl-title-page>` the name of the |
218 | publisher of the :ref:`Modified Version <fdl-modified>`, as the | |
219 | publisher. | |
220 | ||
221 | - **D.** | |
5377d91f MH |
222 | Preserve all the copyright notices of the |
223 | :ref:`Document <fdl-document>`. | |
224 | ||
225 | - **E.** | |
5377d91f MH |
226 | Add an appropriate copyright notice for your modifications adjacent |
227 | to the other copyright notices. | |
228 | ||
229 | - **F.** | |
5377d91f MH |
230 | Include, immediately after the copyright notices, a license notice |
231 | giving the public permission to use the | |
232 | :ref:`Modified Version <fdl-modified>` under the terms of this | |
233 | License, in the form shown in the Addendum below. | |
234 | ||
235 | - **G.** | |
5377d91f MH |
236 | Preserve in that license notice the full lists of |
237 | :ref:`Invariant Sections <fdl-invariant>` and required | |
238 | :ref:`Cover Texts <fdl-cover-texts>` given in the | |
239 | :ref:`Document's <fdl-document>` license notice. | |
240 | ||
241 | - **H.** | |
5377d91f MH |
242 | Include an unaltered copy of this License. |
243 | ||
244 | - **I.** | |
5377d91f MH |
245 | Preserve the section entitled “History”, and its title, and add to it |
246 | an item stating at least the title, year, new authors, and publisher | |
ac4141ce | 247 | of the :ref:`Modified Version <fdl-modified>` as given on the |
5377d91f MH |
248 | :ref:`Title Page <fdl-title-page>`. If there is no section entitled |
249 | “History” in the :ref:`Document <fdl-document>`, create one stating | |
250 | the title, year, authors, and publisher of the Document as given on | |
251 | its Title Page, then add an item describing the Modified Version as | |
252 | stated in the previous sentence. | |
253 | ||
254 | - **J.** | |
5377d91f MH |
255 | Preserve the network location, if any, given in the |
256 | :ref:`Document <fdl-document>` for public access to a | |
257 | :ref:`Transparent <fdl-transparent>` copy of the Document, and | |
258 | likewise the network locations given in the Document for previous | |
259 | versions it was based on. These may be placed in the “History” | |
260 | section. You may omit a network location for a work that was | |
261 | published at least four years before the Document itself, or if the | |
262 | original publisher of the version it refers to gives permission. | |
263 | ||
264 | - **K.** | |
5377d91f MH |
265 | In any section entitled “Acknowledgements” or “Dedications”, preserve |
266 | the section's title, and preserve in the section all the substance | |
267 | and tone of each of the contributor acknowledgements and/or | |
268 | dedications given therein. | |
269 | ||
270 | - **L.** | |
5377d91f MH |
271 | Preserve all the :ref:`Invariant Sections <fdl-invariant>` of the |
272 | :ref:`Document <fdl-document>`, unaltered in their text and in | |
273 | their titles. Section numbers or the equivalent are not considered | |
274 | part of the section titles. | |
275 | ||
276 | - **M.** | |
5377d91f MH |
277 | Delete any section entitled “Endorsements”. Such a section may not be |
278 | included in the :ref:`Modified Version <fdl-modified>`. | |
279 | ||
280 | - **N.** | |
5377d91f MH |
281 | Do not retitle any existing section as “Endorsements” or to conflict |
282 | in title with any :ref:`Invariant Section <fdl-invariant>`. | |
283 | ||
284 | If the :ref:`Modified Version <fdl-modified>` includes new | |
285 | front-matter sections or appendices that qualify as | |
286 | :ref:`Secondary Sections <fdl-secondary>` and contain no material | |
287 | copied from the Document, you may at your option designate some or all | |
288 | of these sections as invariant. To do this, add their titles to the list | |
289 | of :ref:`Invariant Sections <fdl-invariant>` in the Modified Version's | |
290 | license notice. These titles must be distinct from any other section | |
291 | titles. | |
292 | ||
293 | You may add a section entitled “Endorsements”, provided it contains | |
294 | nothing but endorsements of your | |
295 | :ref:`Modified Version <fdl-modified>` by various parties--for | |
296 | example, statements of peer review or that the text has been approved by | |
297 | an organization as the authoritative definition of a standard. | |
298 | ||
299 | You may add a passage of up to five words as a | |
300 | :ref:`Front-Cover Text <fdl-cover-texts>`, and a passage of up to 25 | |
301 | words as a :ref:`Back-Cover Text <fdl-cover-texts>`, to the end of the | |
302 | list of :ref:`Cover Texts <fdl-cover-texts>` in the | |
303 | :ref:`Modified Version <fdl-modified>`. Only one passage of | |
304 | Front-Cover Text and one of Back-Cover Text may be added by (or through | |
305 | arrangements made by) any one entity. If the | |
306 | :ref:`Document <fdl-document>` already includes a cover text for the | |
307 | same cover, previously added by you or by arrangement made by the same | |
308 | entity you are acting on behalf of, you may not add another; but you may | |
309 | replace the old one, on explicit permission from the previous publisher | |
310 | that added the old one. | |
311 | ||
312 | The author(s) and publisher(s) of the :ref:`Document <fdl-document>` | |
313 | do not by this License give permission to use their names for publicity | |
314 | for or to assert or imply endorsement of any | |
315 | :ref:`Modified Version <fdl-modified>`. | |
316 | ||
317 | ||
318 | .. _fdl-section5: | |
319 | ||
320 | 5. COMBINING DOCUMENTS | |
321 | ====================== | |
322 | ||
323 | You may combine the :ref:`Document <fdl-document>` with other | |
324 | documents released under this License, under the terms defined in | |
325 | :ref:`section 4 <fdl-section4>` above for modified versions, provided | |
326 | that you include in the combination all of the | |
327 | :ref:`Invariant Sections <fdl-invariant>` of all of the original | |
328 | documents, unmodified, and list them all as Invariant Sections of your | |
329 | combined work in its license notice. | |
330 | ||
331 | The combined work need only contain one copy of this License, and | |
332 | multiple identical :ref:`Invariant Sections <fdl-invariant>` may be | |
333 | replaced with a single copy. If there are multiple Invariant Sections | |
334 | with the same name but different contents, make the title of each such | |
335 | section unique by adding at the end of it, in parentheses, the name of | |
336 | the original author or publisher of that section if known, or else a | |
337 | unique number. Make the same adjustment to the section titles in the | |
338 | list of Invariant Sections in the license notice of the combined work. | |
339 | ||
340 | In the combination, you must combine any sections entitled “History” in | |
341 | the various original documents, forming one section entitled “History”; | |
342 | likewise combine any sections entitled “Acknowledgements”, and any | |
343 | sections entitled “Dedications”. You must delete all sections entitled | |
344 | “Endorsements.” | |
345 | ||
346 | ||
347 | .. _fdl-section6: | |
348 | ||
349 | 6. COLLECTIONS OF DOCUMENTS | |
350 | =========================== | |
351 | ||
352 | You may make a collection consisting of the | |
353 | :ref:`Document <fdl-document>` and other documents released under this | |
354 | License, and replace the individual copies of this License in the | |
355 | various documents with a single copy that is included in the collection, | |
356 | provided that you follow the rules of this License for verbatim copying | |
357 | of each of the documents in all other respects. | |
358 | ||
359 | You may extract a single document from such a collection, and dispbibute | |
360 | it individually under this License, provided you insert a copy of this | |
361 | License into the extracted document, and follow this License in all | |
362 | other respects regarding verbatim copying of that document. | |
363 | ||
364 | ||
365 | .. _fdl-section7: | |
366 | ||
367 | 7. AGGREGATION WITH INDEPENDENT WORKS | |
368 | ===================================== | |
369 | ||
370 | A compilation of the :ref:`Document <fdl-document>` or its derivatives | |
371 | with other separate and independent documents or works, in or on a | |
372 | volume of a storage or distribution medium, does not as a whole count as | |
373 | a :ref:`Modified Version <fdl-modified>` of the Document, provided no | |
374 | compilation copyright is claimed for the compilation. Such a compilation | |
375 | is called an “aggregate”, and this License does not apply to the other | |
376 | self-contained works thus compiled with the Document , on account of | |
377 | their being thus compiled, if they are not themselves derivative works | |
378 | of the Document. If the :ref:`Cover Text <fdl-cover-texts>` | |
379 | requirement of :ref:`section 3 <fdl-section3>` is applicable to these | |
380 | copies of the Document, then if the Document is less than one quarter of | |
381 | the entire aggregate, the Document's Cover Texts may be placed on covers | |
382 | that surround only the Document within the aggregate. Otherwise they | |
383 | must appear on covers around the whole aggregate. | |
384 | ||
385 | ||
386 | .. _fdl-section8: | |
387 | ||
388 | 8. TRANSLATION | |
389 | ============== | |
390 | ||
391 | Translation is considered a kind of modification, so you may distribute | |
392 | translations of the :ref:`Document <fdl-document>` under the terms of | |
393 | :ref:`section 4 <fdl-section4>`. Replacing | |
394 | :ref:`Invariant Sections <fdl-invariant>` with translations requires | |
395 | special permission from their copyright holders, but you may include | |
396 | translations of some or all Invariant Sections in addition to the | |
397 | original versions of these Invariant Sections. You may include a | |
398 | translation of this License provided that you also include the original | |
399 | English version of this License. In case of a disagreement between the | |
400 | translation and the original English version of this License, the | |
401 | original English version will prevail. | |
402 | ||
403 | ||
404 | .. _fdl-section9: | |
405 | ||
406 | 9. TERMINATION | |
407 | ============== | |
408 | ||
409 | You may not copy, modify, sublicense, or distribute the | |
410 | :ref:`Document <fdl-document>` except as expressly provided for under | |
411 | this License. Any other attempt to copy, modify, sublicense or | |
412 | distribute the Document is void, and will automatically terminate your | |
413 | rights under this License. However, parties who have received copies, or | |
414 | rights, from you under this License will not have their licenses | |
415 | terminated so long as such parties remain in full compliance. | |
416 | ||
417 | ||
418 | .. _fdl-section10: | |
419 | ||
420 | 10. FUTURE REVISIONS OF THIS LICENSE | |
421 | ==================================== | |
422 | ||
423 | The `Free Software Foundation <http://www.gnu.org/fsf/fsf.html>`__ | |
424 | may publish new, revised versions of the GNU Free Documentation License | |
425 | from time to time. Such new versions will be similar in spirit to the | |
426 | present version, but may differ in detail to address new problems or | |
427 | concerns. See | |
428 | `http://www.gnu.org/copyleft/ <http://www.gnu.org/copyleft>`__. | |
429 | ||
430 | Each version of the License is given a distinguishing version number. If | |
431 | the :ref:`Document <fdl-document>` specifies that a particular | |
432 | numbered version of this License “or any later version” applies to it, | |
433 | you have the option of following the terms and conditions either of that | |
434 | specified version or of any later version that has been published (not | |
435 | as a draft) by the Free Software Foundation. If the Document does not | |
436 | specify a version number of this License, you may choose any version | |
437 | ever published (not as a draft) by the Free Software Foundation. | |
438 | ||
439 | ||
440 | .. _fdl-using: | |
441 | ||
442 | Addendum | |
443 | ======== | |
444 | ||
445 | To use this License in a document you have written, include a copy of | |
446 | the License in the document and put the following copyright and license | |
447 | notices just after the title page: | |
448 | ||
449 | Copyright © YEAR YOUR NAME. | |
450 | ||
451 | Permission is granted to copy, distribute and/or modify this | |
452 | document under the terms of the GNU Free Documentation License, | |
453 | Version 1.1 or any later version published by the Free Software | |
454 | Foundation; with the :ref:`Invariant Sections <fdl-invariant>` | |
455 | being LIST THEIR TITLES, with the | |
456 | :ref:`Front-Cover Texts <fdl-cover-texts>` being LIST, and with | |
457 | the :ref:`Back-Cover Texts <fdl-cover-texts>` being LIST. A copy | |
458 | of the license is included in the section entitled “GNU Free | |
459 | Documentation License”. | |
460 | ||
461 | If you have no :ref:`Invariant Sections <fdl-invariant>`, write “with | |
462 | no Invariant Sections” instead of saying which ones are invariant. If | |
463 | you have no :ref:`Front-Cover Texts <fdl-cover-texts>`, write “no | |
464 | Front-Cover Texts” instead of “Front-Cover Texts being LIST”; likewise | |
465 | for :ref:`Back-Cover Texts <fdl-cover-texts>`. | |
466 | ||
467 | If your document contains nontrivial examples of program code, we | |
468 | recommend releasing these examples in parallel under your choice of free | |
469 | software license, such as the | |
470 | `GNU General Public License <http://www.gnu.org/copyleft/gpl.html>`__, | |
471 | to permit their use in free software. |