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0001 Valid-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
0002 Valid-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-only
0003 Valid-License-Identifier: GFDL-1.1-no-invariants-or-later
0004 Valid-License-Identifier: GFDL-1.1-no-invariants-only
0005 SPDX-URL: https://spdx.org/licenses/GFDL-1.1-no-invariants-or-later.html
0006 Usage-Guide:
0007   The GNU Free Documentation License should only be used without
0008   Invariant Sections, Front-Cover Texts or Back-Cover Texts.
0009   It should not be used for new documents, except when they are
0010   part of sections that are already using it (notably, the
0011   userspace-api media documentation).
0012   To use the license in source code, put the following SPDX tag/value pair
0013   into a comment according to the placement guidelines in the licensing
0014   rules documentation:
0015     SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
0016   or
0017     SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-only
0018   or
0019     SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
0020   or
0021     SPDX-License-Identifier: GFDL-1.1-no-invariants-only
0022 License-Text:
0023                 GNU Free Documentation License
0024                    Version 1.1, March 2000
0025 
0026  Copyright (C) 2000  Free Software Foundation, Inc.
0027      51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
0028  Everyone is permitted to copy and distribute verbatim copies
0029  of this license document, but changing it is not allowed.
0030 
0031 
0032 0. PREAMBLE
0033 
0034 The purpose of this License is to make a manual, textbook, or other
0035 written document "free" in the sense of freedom: to assure everyone
0036 the effective freedom to copy and redistribute it, with or without
0037 modifying it, either commercially or noncommercially.  Secondarily,
0038 this License preserves for the author and publisher a way to get
0039 credit for their work, while not being considered responsible for
0040 modifications made by others.
0041 
0042 This License is a kind of "copyleft", which means that derivative
0043 works of the document must themselves be free in the same sense.  It
0044 complements the GNU General Public License, which is a copyleft
0045 license designed for free software.
0046 
0047 We have designed this License in order to use it for manuals for free
0048 software, because free software needs free documentation: a free
0049 program should come with manuals providing the same freedoms that the
0050 software does.  But this License is not limited to software manuals;
0051 it can be used for any textual work, regardless of subject matter or
0052 whether it is published as a printed book.  We recommend this License
0053 principally for works whose purpose is instruction or reference.
0054 
0055 
0056 1. APPLICABILITY AND DEFINITIONS
0057 
0058 This License applies to any manual or other work that contains a
0059 notice placed by the copyright holder saying it can be distributed
0060 under the terms of this License.  The "Document", below, refers to any
0061 such manual or work.  Any member of the public is a licensee, and is
0062 addressed as "you".
0063 
0064 A "Modified Version" of the Document means any work containing the
0065 Document or a portion of it, either copied verbatim, or with
0066 modifications and/or translated into another language.
0067 
0068 A "Secondary Section" is a named appendix or a front-matter section of
0069 the Document that deals exclusively with the relationship of the
0070 publishers or authors of the Document to the Document's overall subject
0071 (or to related matters) and contains nothing that could fall directly
0072 within that overall subject.  (For example, if the Document is in part a
0073 textbook of mathematics, a Secondary Section may not explain any
0074 mathematics.)  The relationship could be a matter of historical
0075 connection with the subject or with related matters, or of legal,
0076 commercial, philosophical, ethical or political position regarding
0077 them.
0078 
0079 The "Invariant Sections" are certain Secondary Sections whose titles
0080 are designated, as being those of Invariant Sections, in the notice
0081 that says that the Document is released under this License.
0082 
0083 The "Cover Texts" are certain short passages of text that are listed,
0084 as Front-Cover Texts or Back-Cover Texts, in the notice that says that
0085 the Document is released under this License.
0086 
0087 A "Transparent" copy of the Document means a machine-readable copy,
0088 represented in a format whose specification is available to the
0089 general public, whose contents can be viewed and edited directly and
0090 straightforwardly with generic text editors or (for images composed of
0091 pixels) generic paint programs or (for drawings) some widely available
0092 drawing editor, and that is suitable for input to text formatters or
0093 for automatic translation to a variety of formats suitable for input
0094 to text formatters.  A copy made in an otherwise Transparent file
0095 format whose markup has been designed to thwart or discourage
0096 subsequent modification by readers is not Transparent.  A copy that is
0097 not "Transparent" is called "Opaque".
0098 
0099 Examples of suitable formats for Transparent copies include plain
0100 ASCII without markup, Texinfo input format, LaTeX input format, SGML
0101 or XML using a publicly available DTD, and standard-conforming simple
0102 HTML designed for human modification.  Opaque formats include
0103 PostScript, PDF, proprietary formats that can be read and edited only
0104 by proprietary word processors, SGML or XML for which the DTD and/or
0105 processing tools are not generally available, and the
0106 machine-generated HTML produced by some word processors for output
0107 purposes only.
0108 
0109 The "Title Page" means, for a printed book, the title page itself,
0110 plus such following pages as are needed to hold, legibly, the material
0111 this License requires to appear in the title page.  For works in
0112 formats which do not have any title page as such, "Title Page" means
0113 the text near the most prominent appearance of the work's title,
0114 preceding the beginning of the body of the text.
0115 
0116 
0117 2. VERBATIM COPYING
0118 
0119 You may copy and distribute the Document in any medium, either
0120 commercially or noncommercially, provided that this License, the
0121 copyright notices, and the license notice saying this License applies
0122 to the Document are reproduced in all copies, and that you add no other
0123 conditions whatsoever to those of this License.  You may not use
0124 technical measures to obstruct or control the reading or further
0125 copying of the copies you make or distribute.  However, you may accept
0126 compensation in exchange for copies.  If you distribute a large enough
0127 number of copies you must also follow the conditions in section 3.
0128 
0129 You may also lend copies, under the same conditions stated above, and
0130 you may publicly display copies.
0131 
0132 
0133 3. COPYING IN QUANTITY
0134 
0135 If you publish printed copies of the Document numbering more than 100,
0136 and the Document's license notice requires Cover Texts, you must enclose
0137 the copies in covers that carry, clearly and legibly, all these Cover
0138 Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on
0139 the back cover.  Both covers must also clearly and legibly identify
0140 you as the publisher of these copies.  The front cover must present
0141 the full title with all words of the title equally prominent and
0142 visible.  You may add other material on the covers in addition.
0143 Copying with changes limited to the covers, as long as they preserve
0144 the title of the Document and satisfy these conditions, can be treated
0145 as verbatim copying in other respects.
0146 
0147 If the required texts for either cover are too voluminous to fit
0148 legibly, you should put the first ones listed (as many as fit
0149 reasonably) on the actual cover, and continue the rest onto adjacent
0150 pages.
0151 
0152 If you publish or distribute Opaque copies of the Document numbering
0153 more than 100, you must either include a machine-readable Transparent
0154 copy along with each Opaque copy, or state in or with each Opaque copy
0155 a publicly-accessible computer-network location containing a complete
0156 Transparent copy of the Document, free of added material, which the
0157 general network-using public has access to download anonymously at no
0158 charge using public-standard network protocols.  If you use the latter
0159 option, you must take reasonably prudent steps, when you begin
0160 distribution of Opaque copies in quantity, to ensure that this
0161 Transparent copy will remain thus accessible at the stated location
0162 until at least one year after the last time you distribute an Opaque
0163 copy (directly or through your agents or retailers) of that edition to
0164 the public.
0165 
0166 It is requested, but not required, that you contact the authors of the
0167 Document well before redistributing any large number of copies, to give
0168 them a chance to provide you with an updated version of the Document.
0169 
0170 
0171 4. MODIFICATIONS
0172 
0173 You may copy and distribute a Modified Version of the Document under
0174 the conditions of sections 2 and 3 above, provided that you release
0175 the Modified Version under precisely this License, with the Modified
0176 Version filling the role of the Document, thus licensing distribution
0177 and modification of the Modified Version to whoever possesses a copy
0178 of it.  In addition, you must do these things in the Modified Version:
0179 
0180 A. Use in the Title Page (and on the covers, if any) a title distinct
0181    from that of the Document, and from those of previous versions
0182    (which should, if there were any, be listed in the History section
0183    of the Document).  You may use the same title as a previous version
0184    if the original publisher of that version gives permission.
0185 B. List on the Title Page, as authors, one or more persons or entities
0186    responsible for authorship of the modifications in the Modified
0187    Version, together with at least five of the principal authors of the
0188    Document (all of its principal authors, if it has less than five).
0189 C. State on the Title page the name of the publisher of the
0190    Modified Version, as the publisher.
0191 D. Preserve all the copyright notices of the Document.
0192 E. Add an appropriate copyright notice for your modifications
0193    adjacent to the other copyright notices.
0194 F. Include, immediately after the copyright notices, a license notice
0195    giving the public permission to use the Modified Version under the
0196    terms of this License, in the form shown in the Addendum below.
0197 G. Preserve in that license notice the full lists of Invariant Sections
0198    and required Cover Texts given in the Document's license notice.
0199 H. Include an unaltered copy of this License.
0200 I. Preserve the section entitled "History", and its title, and add to
0201    it an item stating at least the title, year, new authors, and
0202    publisher of the Modified Version as given on the Title Page.  If
0203    there is no section entitled "History" in the Document, create one
0204    stating the title, year, authors, and publisher of the Document as
0205    given on its Title Page, then add an item describing the Modified
0206    Version as stated in the previous sentence.
0207 J. Preserve the network location, if any, given in the Document for
0208    public access to a Transparent copy of the Document, and likewise
0209    the network locations given in the Document for previous versions
0210    it was based on.  These may be placed in the "History" section.
0211    You may omit a network location for a work that was published at
0212    least four years before the Document itself, or if the original
0213    publisher of the version it refers to gives permission.
0214 K. In any section entitled "Acknowledgements" or "Dedications",
0215    preserve the section's title, and preserve in the section all the
0216    substance and tone of each of the contributor acknowledgements
0217    and/or dedications given therein.
0218 L. Preserve all the Invariant Sections of the Document,
0219    unaltered in their text and in their titles.  Section numbers
0220    or the equivalent are not considered part of the section titles.
0221 M. Delete any section entitled "Endorsements".  Such a section
0222    may not be included in the Modified Version.
0223 N. Do not retitle any existing section as "Endorsements"
0224    or to conflict in title with any Invariant Section.
0225 
0226 If the Modified Version includes new front-matter sections or
0227 appendices that qualify as Secondary Sections and contain no material
0228 copied from the Document, you may at your option designate some or all
0229 of these sections as invariant.  To do this, add their titles to the
0230 list of Invariant Sections in the Modified Version's license notice.
0231 These titles must be distinct from any other section titles.
0232 
0233 You may add a section entitled "Endorsements", provided it contains
0234 nothing but endorsements of your Modified Version by various
0235 parties--for example, statements of peer review or that the text has
0236 been approved by an organization as the authoritative definition of a
0237 standard.
0238 
0239 You may add a passage of up to five words as a Front-Cover Text, and a
0240 passage of up to 25 words as a Back-Cover Text, to the end of the list
0241 of Cover Texts in the Modified Version.  Only one passage of
0242 Front-Cover Text and one of Back-Cover Text may be added by (or
0243 through arrangements made by) any one entity.  If the Document already
0244 includes a cover text for the same cover, previously added by you or
0245 by arrangement made by the same entity you are acting on behalf of,
0246 you may not add another; but you may replace the old one, on explicit
0247 permission from the previous publisher that added the old one.
0248 
0249 The author(s) and publisher(s) of the Document do not by this License
0250 give permission to use their names for publicity for or to assert or
0251 imply endorsement of any Modified Version.
0252 
0253 
0254 5. COMBINING DOCUMENTS
0255 
0256 You may combine the Document with other documents released under this
0257 License, under the terms defined in section 4 above for modified
0258 versions, provided that you include in the combination all of the
0259 Invariant Sections of all of the original documents, unmodified, and
0260 list them all as Invariant Sections of your combined work in its
0261 license notice.
0262 
0263 The combined work need only contain one copy of this License, and
0264 multiple identical Invariant Sections may be replaced with a single
0265 copy.  If there are multiple Invariant Sections with the same name but
0266 different contents, make the title of each such section unique by
0267 adding at the end of it, in parentheses, the name of the original
0268 author or publisher of that section if known, or else a unique number.
0269 Make the same adjustment to the section titles in the list of
0270 Invariant Sections in the license notice of the combined work.
0271 
0272 In the combination, you must combine any sections entitled "History"
0273 in the various original documents, forming one section entitled
0274 "History"; likewise combine any sections entitled "Acknowledgements",
0275 and any sections entitled "Dedications".  You must delete all sections
0276 entitled "Endorsements."
0277 
0278 
0279 6. COLLECTIONS OF DOCUMENTS
0280 
0281 You may make a collection consisting of the Document and other documents
0282 released under this License, and replace the individual copies of this
0283 License in the various documents with a single copy that is included in
0284 the collection, provided that you follow the rules of this License for
0285 verbatim copying of each of the documents in all other respects.
0286 
0287 You may extract a single document from such a collection, and distribute
0288 it individually under this License, provided you insert a copy of this
0289 License into the extracted document, and follow this License in all
0290 other respects regarding verbatim copying of that document.
0291 
0292 
0293 7. AGGREGATION WITH INDEPENDENT WORKS
0294 
0295 A compilation of the Document or its derivatives with other separate
0296 and independent documents or works, in or on a volume of a storage or
0297 distribution medium, does not as a whole count as a Modified Version
0298 of the Document, provided no compilation copyright is claimed for the
0299 compilation.  Such a compilation is called an "aggregate", and this
0300 License does not apply to the other self-contained works thus compiled
0301 with the Document, on account of their being thus compiled, if they
0302 are not themselves derivative works of the Document.
0303 
0304 If the Cover Text requirement of section 3 is applicable to these
0305 copies of the Document, then if the Document is less than one quarter
0306 of the entire aggregate, the Document's Cover Texts may be placed on
0307 covers that surround only the Document within the aggregate.
0308 Otherwise they must appear on covers around the whole aggregate.
0309 
0310 
0311 8. TRANSLATION
0312 
0313 Translation is considered a kind of modification, so you may
0314 distribute translations of the Document under the terms of section 4.
0315 Replacing Invariant Sections with translations requires special
0316 permission from their copyright holders, but you may include
0317 translations of some or all Invariant Sections in addition to the
0318 original versions of these Invariant Sections.  You may include a
0319 translation of this License provided that you also include the
0320 original English version of this License.  In case of a disagreement
0321 between the translation and the original English version of this
0322 License, the original English version will prevail.
0323 
0324 
0325 9. TERMINATION
0326 
0327 You may not copy, modify, sublicense, or distribute the Document except
0328 as expressly provided for under this License.  Any other attempt to
0329 copy, modify, sublicense or distribute the Document is void, and will
0330 automatically terminate your rights under this License.  However,
0331 parties who have received copies, or rights, from you under this
0332 License will not have their licenses terminated so long as such
0333 parties remain in full compliance.
0334 
0335 
0336 10. FUTURE REVISIONS OF THIS LICENSE
0337 
0338 The Free Software Foundation may publish new, revised versions
0339 of the GNU Free Documentation License from time to time.  Such new
0340 versions will be similar in spirit to the present version, but may
0341 differ in detail to address new problems or concerns.  See
0342 https://www.gnu.org/licenses/.
0343 
0344 Each version of the License is given a distinguishing version number.
0345 If the Document specifies that a particular numbered version of this
0346 License "or any later version" applies to it, you have the option of
0347 following the terms and conditions either of that specified version or
0348 of any later version that has been published (not as a draft) by the
0349 Free Software Foundation.  If the Document does not specify a version
0350 number of this License, you may choose any version ever published (not
0351 as a draft) by the Free Software Foundation.
0352 
0353 
0354 ADDENDUM: How to use this License for your documents
0355 
0356 To use this License in a document you have written, include a copy of
0357 the License in the document and put the following copyright and
0358 license notices just after the title page:
0359 
0360       Copyright (c)  YEAR  YOUR NAME.
0361       Permission is granted to copy, distribute and/or modify this document
0362       under the terms of the GNU Free Documentation License, Version 1.1
0363       or any later version published by the Free Software Foundation;
0364       with the Invariant Sections being LIST THEIR TITLES, with the
0365       Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST.
0366       A copy of the license is included in the section entitled "GNU
0367       Free Documentation License".
0368 
0369 If you have no Invariant Sections, write "with no Invariant Sections"
0370 instead of saying which ones are invariant.  If you have no
0371 Front-Cover Texts, write "no Front-Cover Texts" instead of
0372 "Front-Cover Texts being LIST"; likewise for Back-Cover Texts.
0373 
0374 If your document contains nontrivial examples of program code, we
0375 recommend releasing these examples in parallel under your choice of
0376 free software license, such as the GNU General Public License,
0377 to permit their use in free software.