1 Valid-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later 2 Valid-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-only 3 Valid-License-Identifier: GFDL-1.1-no-invariants-or-later 4 Valid-License-Identifier: GFDL-1.1-no-invariants-only 5 SPDX-URL: https://spdx.org/licenses/GFDL-1.1-no-invariants-or-later.html 6 Usage-Guide: 7 The GNU Free Documentation License should only be used without 8 Invariant Sections, Front-Cover Texts or Back-Cover Texts. 9 It should not be used for new documents, except when they are 10 part of sections that are already using it (notably, the 11 userspace-api media documentation). 12 To use the license in source code, put the following SPDX tag/value pair 13 into a comment according to the placement guidelines in the licensing 14 rules documentation: 15 SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later 16 or 17 SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-only 18 or 19 SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 20 or 21 SPDX-License-Identifier: GFDL-1.1-no-invariants-only 22 License-Text: 23 GNU Free Documentation License 24 Version 1.1, March 2000 25 26 Copyright (C) 2000 Free Software Foundation, Inc. 27 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 28 Everyone is permitted to copy and distribute verbatim copies 29 of this license document, but changing it is not allowed. 30 31 32 0. PREAMBLE 33 34 The purpose of this License is to make a manual, textbook, or other 35 written document "free" in the sense of freedom: to assure everyone 36 the effective freedom to copy and redistribute it, with or without 37 modifying it, either commercially or noncommercially. Secondarily, 38 this License preserves for the author and publisher a way to get 39 credit for their work, while not being considered responsible for 40 modifications made by others. 41 42 This License is a kind of "copyleft", which means that derivative 43 works of the document must themselves be free in the same sense. It 44 complements the GNU General Public License, which is a copyleft 45 license designed for free software. 46 47 We have designed this License in order to use it for manuals for free 48 software, because free software needs free documentation: a free 49 program should come with manuals providing the same freedoms that the 50 software does. But this License is not limited to software manuals; 51 it can be used for any textual work, regardless of subject matter or 52 whether it is published as a printed book. We recommend this License 53 principally for works whose purpose is instruction or reference. 54 55 56 1. APPLICABILITY AND DEFINITIONS 57 58 This License applies to any manual or other work that contains a 59 notice placed by the copyright holder saying it can be distributed 60 under the terms of this License. The "Document", below, refers to any 61 such manual or work. Any member of the public is a licensee, and is 62 addressed as "you". 63 64 A "Modified Version" of the Document means any work containing the 65 Document or a portion of it, either copied verbatim, or with 66 modifications and/or translated into another language. 67 68 A "Secondary Section" is a named appendix or a front-matter section of 69 the Document that deals exclusively with the relationship of the 70 publishers or authors of the Document to the Document's overall subject 71 (or to related matters) and contains nothing that could fall directly 72 within that overall subject. (For example, if the Document is in part a 73 textbook of mathematics, a Secondary Section may not explain any 74 mathematics.) 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VERBATIM COPYING 118 119 You may copy and distribute the Document in any medium, either 120 commercially or noncommercially, provided that this License, the 121 copyright notices, and the license notice saying this License applies 122 to the Document are reproduced in all copies, and that you add no other 123 conditions whatsoever to those of this License. You may not use 124 technical measures to obstruct or control the reading or further 125 copying of the copies you make or distribute. However, you may accept 126 compensation in exchange for copies. If you distribute a large enough 127 number of copies you must also follow the conditions in section 3. 128 129 You may also lend copies, under the same conditions stated above, and 130 you may publicly display copies. 131 132 133 3. COPYING IN QUANTITY 134 135 If you publish printed copies of the Document numbering more than 100, 136 and the Document's license notice requires Cover Texts, you must enclose 137 the copies in covers that carry, clearly and legibly, all these Cover 138 Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on 139 the back cover. Both covers must also clearly and legibly identify 140 you as the publisher of these copies. The front cover must present 141 the full title with all words of the title equally prominent and 142 visible. 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If you use the latter 159 option, you must take reasonably prudent steps, when you begin 160 distribution of Opaque copies in quantity, to ensure that this 161 Transparent copy will remain thus accessible at the stated location 162 until at least one year after the last time you distribute an Opaque 163 copy (directly or through your agents or retailers) of that edition to 164 the public. 165 166 It is requested, but not required, that you contact the authors of the 167 Document well before redistributing any large number of copies, to give 168 them a chance to provide you with an updated version of the Document. 169 170 171 4. MODIFICATIONS 172 173 You may copy and distribute a Modified Version of the Document under 174 the conditions of sections 2 and 3 above, provided that you release 175 the Modified Version under precisely this License, with the Modified 176 Version filling the role of the Document, thus licensing distribution 177 and modification of the Modified Version to whoever possesses a copy 178 of it. In addition, you must do these things in the Modified Version: 179 180 A. Use in the Title Page (and on the covers, if any) a title distinct 181 from that of the Document, and from those of previous versions 182 (which should, if there were any, be listed in the History section 183 of the Document). You may use the same title as a previous version 184 if the original publisher of that version gives permission. 185 B. 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Preserve the section entitled "History", and its title, and add to 201 it an item stating at least the title, year, new authors, and 202 publisher of the Modified Version as given on the Title Page. If 203 there is no section entitled "History" in the Document, create one 204 stating the title, year, authors, and publisher of the Document as 205 given on its Title Page, then add an item describing the Modified 206 Version as stated in the previous sentence. 207 J. Preserve the network location, if any, given in the Document for 208 public access to a Transparent copy of the Document, and likewise 209 the network locations given in the Document for previous versions 210 it was based on. These may be placed in the "History" section. 211 You may omit a network location for a work that was published at 212 least four years before the Document itself, or if the original 213 publisher of the version it refers to gives permission. 214 K. In any section entitled "Acknowledgements" or "Dedications", 215 preserve the section's title, and preserve in the section all the 216 substance and tone of each of the contributor acknowledgements 217 and/or dedications given therein. 218 L. Preserve all the Invariant Sections of the Document, 219 unaltered in their text and in their titles. Section numbers 220 or the equivalent are not considered part of the section titles. 221 M. Delete any section entitled "Endorsements". Such a section 222 may not be included in the Modified Version. 223 N. Do not retitle any existing section as "Endorsements" 224 or to conflict in title with any Invariant Section. 225 226 If the Modified Version includes new front-matter sections or 227 appendices that qualify as Secondary Sections and contain no material 228 copied from the Document, you may at your option designate some or all 229 of these sections as invariant. To do this, add their titles to the 230 list of Invariant Sections in the Modified Version's license notice. 231 These titles must be distinct from any other section titles. 232 233 You may add a section entitled "Endorsements", provided it contains 234 nothing but endorsements of your Modified Version by various 235 parties--for example, statements of peer review or that the text has 236 been approved by an organization as the authoritative definition of a 237 standard. 238 239 You may add a passage of up to five words as a Front-Cover Text, and a 240 passage of up to 25 words as a Back-Cover Text, to the end of the list 241 of Cover Texts in the Modified Version. Only one passage of 242 Front-Cover Text and one of Back-Cover Text may be added by (or 243 through arrangements made by) any one entity. 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COMBINING DOCUMENTS 255 256 You may combine the Document with other documents released under this 257 License, under the terms defined in section 4 above for modified 258 versions, provided that you include in the combination all of the 259 Invariant Sections of all of the original documents, unmodified, and 260 list them all as Invariant Sections of your combined work in its 261 license notice. 262 263 The combined work need only contain one copy of this License, and 264 multiple identical Invariant Sections may be replaced with a single 265 copy. If there are multiple Invariant Sections with the same name but 266 different contents, make the title of each such section unique by 267 adding at the end of it, in parentheses, the name of the original 268 author or publisher of that section if known, or else a unique number. 269 Make the same adjustment to the section titles in the list of 270 Invariant Sections in the license notice of the combined work. 271 272 In the combination, you must combine any sections entitled "History" 273 in the various original documents, forming one section entitled 274 "History"; likewise combine any sections entitled "Acknowledgements", 275 and any sections entitled "Dedications". You must delete all sections 276 entitled "Endorsements." 277 278 279 6. COLLECTIONS OF DOCUMENTS 280 281 You may make a collection consisting of the Document and other documents 282 released under this License, and replace the individual copies of this 283 License in the various documents with a single copy that is included in 284 the collection, provided that you follow the rules of this License for 285 verbatim copying of each of the documents in all other respects. 286 287 You may extract a single document from such a collection, and distribute 288 it individually under this License, provided you insert a copy of this 289 License into the extracted document, and follow this License in all 290 other respects regarding verbatim copying of that document. 291 292 293 7. AGGREGATION WITH INDEPENDENT WORKS 294 295 A compilation of the Document or its derivatives with other separate 296 and independent documents or works, in or on a volume of a storage or 297 distribution medium, does not as a whole count as a Modified Version 298 of the Document, provided no compilation copyright is claimed for the 299 compilation. Such a compilation is called an "aggregate", and this 300 License does not apply to the other self-contained works thus compiled 301 with the Document, on account of their being thus compiled, if they 302 are not themselves derivative works of the Document. 303 304 If the Cover Text requirement of section 3 is applicable to these 305 copies of the Document, then if the Document is less than one quarter 306 of the entire aggregate, the Document's Cover Texts may be placed on 307 covers that surround only the Document within the aggregate. 308 Otherwise they must appear on covers around the whole aggregate. 309 310 311 8. TRANSLATION 312 313 Translation is considered a kind of modification, so you may 314 distribute translations of the Document under the terms of section 4. 315 Replacing Invariant Sections with translations requires special 316 permission from their copyright holders, but you may include 317 translations of some or all Invariant Sections in addition to the 318 original versions of these Invariant Sections. You may include a 319 translation of this License provided that you also include the 320 original English version of this License. In case of a disagreement 321 between the translation and the original English version of this 322 License, the original English version will prevail. 323 324 325 9. TERMINATION 326 327 You may not copy, modify, sublicense, or distribute the Document except 328 as expressly provided for under this License. Any other attempt to 329 copy, modify, sublicense or distribute the Document is void, and will 330 automatically terminate your rights under this License. However, 331 parties who have received copies, or rights, from you under this 332 License will not have their licenses terminated so long as such 333 parties remain in full compliance. 334 335 336 10. FUTURE REVISIONS OF THIS LICENSE 337 338 The Free Software Foundation may publish new, revised versions 339 of the GNU Free Documentation License from time to time. Such new 340 versions will be similar in spirit to the present version, but may 341 differ in detail to address new problems or concerns. See 342 https://www.gnu.org/licenses/. 343 344 Each version of the License is given a distinguishing version number. 345 If the Document specifies that a particular numbered version of this 346 License "or any later version" applies to it, you have the option of 347 following the terms and conditions either of that specified version or 348 of any later version that has been published (not as a draft) by the 349 Free Software Foundation. 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