1@c -*-texinfo-*- 2@node GNU Free Documentation License 3@appendix GNU Free Documentation License 4@center Version 1.1, March 2000 5 6@display 7Copyright (C) 2000, Free Software Foundation, Inc. 859 Temple Place, Suite 330, Boston, MA 02111-1307 USA 9 10Everyone is permitted to copy and distribute verbatim copies 11of this license document, but changing it is not allowed. 12@end display 13@sp 1 14@enumerate 0 15@item 16PREAMBLE 17 18The purpose of this License is to make a manual, textbook, or other 19written document ``free'' in the sense of freedom: to assure everyone 20the effective freedom to copy and redistribute it, with or without 21modifying it, either commercially or noncommercially. Secondarily, 22this License preserves for the author and publisher a way to get 23credit for their work, while not being considered responsible for 24modifications made by others. 25 26This License is a kind of ``copyleft'', which means that derivative 27works of the document must themselves be free in the same sense. It 28complements the GNU General Public License, which is a copyleft 29license designed for free software. 30 31We have designed this License in order to use it for manuals for free 32software, because free software needs free documentation: a free 33program should come with manuals providing the same freedoms that the 34software does. But this License is not limited to software manuals; 35it can be used for any textual work, regardless of subject matter or 36whether it is published as a printed book. We recommend this License 37principally for works whose purpose is instruction or reference. 38 39@sp 1 40@item 41APPLICABILITY AND DEFINITIONS 42 43This License applies to any manual or other work that contains a 44notice placed by the copyright holder saying it can be distributed 45under the terms of this License. The ``Document'', below, refers to any 46such manual or work. Any member of the public is a licensee, and is 47addressed as ``you.'' 48 49A ``Modified Version'' of the Document means any work containing the 50Document or a portion of it, either copied verbatim, or with 51modifications and/or translated into another language. 52 53A ``Secondary Section'' is a named appendix or a front-matter section of 54the Document that deals exclusively with the relationship of the 55publishers or authors of the Document to the Document's overall subject 56(or to related matters) and contains nothing that could fall directly 57within that overall subject. (For example, if the Document is in part a 58textbook of mathematics, a Secondary Section may not explain any 59mathematics.) The relationship could be a matter of historical 60connection with the subject or with related matters, or of legal, 61commercial, philosophical, ethical or political position regarding 62them. 63 64The ``Invariant Sections'' are certain Secondary Sections whose titles 65are designated, as being those of Invariant Sections, in the notice 66that says that the Document is released under this License. 67 68The ``Cover Texts'' are certain short passages of text that are listed, 69as Front-Cover Texts or Back-Cover Texts, in the notice that says that 70the Document is released under this License. 71 72A ``Transparent'' copy of the Document means a machine-readable copy, 73represented in a format whose specification is available to the 74general public, whose contents can be viewed and edited directly and 75straightforwardly with generic text editors or (for images composed of 76pixels) generic paint programs or (for drawings) some widely available 77drawing editor, and that is suitable for input to text formatters or 78for automatic translation to a variety of formats suitable for input 79to text formatters. A copy made in an otherwise Transparent file 80format whose markup has been designed to thwart or discourage 81subsequent modification by readers is not Transparent. A copy that is 82not ``Transparent'' is called ``Opaque.'' 83 84Examples of suitable formats for Transparent copies include plain 85ASCII without markup, Texinfo input format, LaTeX input format, SGML 86or XML using a publicly available DTD, and standard-conforming simple 87HTML designed for human modification. Opaque formats include 88PostScript, PDF, proprietary formats that can be read and edited only 89by proprietary word processors, SGML or XML for which the DTD and/or 90processing tools are not generally available, and the 91machine-generated HTML produced by some word processors for output 92purposes only. 93 94The ``Title Page'' means, for a printed book, the title page itself, 95plus such following pages as are needed to hold, legibly, the material 96this License requires to appear in the title page. For works in 97formats which do not have any title page as such, ``Title Page'' means 98the text near the most prominent appearance of the work's title, 99preceding the beginning of the body of the text. 100@sp 1 101@item 102VERBATIM COPYING 103 104You may copy and distribute the Document in any medium, either 105commercially or noncommercially, provided that this License, the 106copyright notices, and the license notice saying this License applies 107to the Document are reproduced in all copies, and that you add no other 108conditions whatsoever to those of this License. You may not use 109technical measures to obstruct or control the reading or further 110copying of the copies you make or distribute. However, you may accept 111compensation in exchange for copies. If you distribute a large enough 112number of copies you must also follow the conditions in section 3. 113 114You may also lend copies, under the same conditions stated above, and 115you may publicly display copies. 116@sp 1 117@item 118COPYING IN QUANTITY 119 120If you publish printed copies of the Document numbering more than 100, 121and the Document's license notice requires Cover Texts, you must enclose 122the copies in covers that carry, clearly and legibly, all these Cover 123Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on 124the back cover. Both covers must also clearly and legibly identify 125you as the publisher of these copies. The front cover must present 126the full title with all words of the title equally prominent and 127visible. You may add other material on the covers in addition. 128Copying with changes limited to the covers, as long as they preserve 129the title of the Document and satisfy these conditions, can be treated 130as verbatim copying in other respects. 131 132If the required texts for either cover are too voluminous to fit 133legibly, you should put the first ones listed (as many as fit 134reasonably) on the actual cover, and continue the rest onto adjacent 135pages. 136 137If you publish or distribute Opaque copies of the Document numbering 138more than 100, you must either include a machine-readable Transparent 139copy along with each Opaque copy, or state in or with each Opaque copy 140a publicly-accessible computer-network location containing a complete 141Transparent copy of the Document, free of added material, which the 142general network-using public has access to download anonymously at no 143charge using public-standard network protocols. If you use the latter 144option, you must take reasonably prudent steps, when you begin 145distribution of Opaque copies in quantity, to ensure that this 146Transparent copy will remain thus accessible at the stated location 147until at least one year after the last time you distribute an Opaque 148copy (directly or through your agents or retailers) of that edition to 149the public. 150 151It is requested, but not required, that you contact the authors of the 152Document well before redistributing any large number of copies, to give 153them a chance to provide you with an updated version of the Document. 154@sp 1 155@item 156MODIFICATIONS 157 158You may copy and distribute a Modified Version of the Document under 159the conditions of sections 2 and 3 above, provided that you release 160the Modified Version under precisely this License, with the Modified 161Version filling the role of the Document, thus licensing distribution 162and modification of the Modified Version to whoever possesses a copy 163of it. In addition, you must do these things in the Modified Version: 164 165A. Use in the Title Page (and on the covers, if any) a title distinct 166 from that of the Document, and from those of previous versions 167 (which should, if there were any, be listed in the History section 168 of the Document). You may use the same title as a previous version 169 if the original publisher of that version gives permission.@* 170B. List on the Title Page, as authors, one or more persons or entities 171 responsible for authorship of the modifications in the Modified 172 Version, together with at least five of the principal authors of the 173 Document (all of its principal authors, if it has less than five).@* 174C. State on the Title page the name of the publisher of the 175 Modified Version, as the publisher.@* 176D. Preserve all the copyright notices of the Document.@* 177E. Add an appropriate copyright notice for your modifications 178 adjacent to the other copyright notices.@* 179F. Include, immediately after the copyright notices, a license notice 180 giving the public permission to use the Modified Version under the 181 terms of this License, in the form shown in the Addendum below.@* 182G. Preserve in that license notice the full lists of Invariant Sections 183 and required Cover Texts given in the Document's license notice.@* 184H. Include an unaltered copy of this License.@* 185I. Preserve the section entitled ``History'', and its title, and add to 186 it an item stating at least the title, year, new authors, and 187 publisher of the Modified Version as given on the Title Page. If 188 there is no section entitled ``History'' in the Document, create one 189 stating the title, year, authors, and publisher of the Document as 190 given on its Title Page, then add an item describing the Modified 191 Version as stated in the previous sentence.@* 192J. Preserve the network location, if any, given in the Document for 193 public access to a Transparent copy of the Document, and likewise 194 the network locations given in the Document for previous versions 195 it was based on. These may be placed in the ``History'' section. 196 You may omit a network location for a work that was published at 197 least four years before the Document itself, or if the original 198 publisher of the version it refers to gives permission.@* 199K. In any section entitled ``Acknowledgements'' or ``Dedications'', 200 preserve the section's title, and preserve in the section all the 201 substance and tone of each of the contributor acknowledgements 202 and/or dedications given therein.@* 203L. Preserve all the Invariant Sections of the Document, 204 unaltered in their text and in their titles. Section numbers 205 or the equivalent are not considered part of the section titles.@* 206M. Delete any section entitled ``Endorsements.'' Such a section 207 may not be included in the Modified Version.@* 208N. Do not retitle any existing section as ``Endorsements'' 209 or to conflict in title with any Invariant Section.@* 210@sp 1 211If the Modified Version includes new front-matter sections or 212appendices that qualify as Secondary Sections and contain no material 213copied from the Document, you may at your option designate some or all 214of these sections as invariant. To do this, add their titles to the 215list of Invariant Sections in the Modified Version's license notice. 216These titles must be distinct from any other section titles. 217 218You may add a section entitled ``Endorsements'', provided it contains 219nothing but endorsements of your Modified Version by various 220parties--for example, statements of peer review or that the text has 221been approved by an organization as the authoritative definition of a 222standard. 223 224You may add a passage of up to five words as a Front-Cover Text, and a 225passage of up to 25 words as a Back-Cover Text, to the end of the list 226of Cover Texts in the Modified Version. Only one passage of 227Front-Cover Text and one of Back-Cover Text may be added by (or 228through arrangements made by) any one entity. If the Document already 229includes a cover text for the same cover, previously added by you or 230by arrangement made by the same entity you are acting on behalf of, 231you may not add another; but you may replace the old one, on explicit 232permission from the previous publisher that added the old one. 233 234The author(s) and publisher(s) of the Document do not by this License 235give permission to use their names for publicity for or to assert or 236imply endorsement of any Modified Version. 237@sp 1 238@item 239COMBINING DOCUMENTS 240 241You may combine the Document with other documents released under this 242License, under the terms defined in section 4 above for modified 243versions, provided that you include in the combination all of the 244Invariant Sections of all of the original documents, unmodified, and 245list them all as Invariant Sections of your combined work in its 246license notice. 247 248The combined work need only contain one copy of this License, and 249multiple identical Invariant Sections may be replaced with a single 250copy. If there are multiple Invariant Sections with the same name but 251different contents, make the title of each such section unique by 252adding at the end of it, in parentheses, the name of the original 253author or publisher of that section if known, or else a unique number. 254Make the same adjustment to the section titles in the list of 255Invariant Sections in the license notice of the combined work. 256 257In the combination, you must combine any sections entitled ``History'' 258in the various original documents, forming one section entitled 259``History''; likewise combine any sections entitled ``Acknowledgements'', 260and any sections entitled ``Dedications.'' You must delete all sections 261entitled ``Endorsements.'' 262@sp 1 263@item 264COLLECTIONS OF DOCUMENTS 265 266You may make a collection consisting of the Document and other documents 267released under this License, and replace the individual copies of this 268License in the various documents with a single copy that is included in 269the collection, provided that you follow the rules of this License for 270verbatim copying of each of the documents in all other respects. 271 272You may extract a single document from such a collection, and distribute 273it individually under this License, provided you insert a copy of this 274License into the extracted document, and follow this License in all 275other respects regarding verbatim copying of that document. 276@sp 1 277@item 278AGGREGATION WITH INDEPENDENT WORKS 279 280A compilation of the Document or its derivatives with other separate 281and independent documents or works, in or on a volume of a storage or 282distribution medium, does not as a whole count as a Modified Version 283of the Document, provided no compilation copyright is claimed for the 284compilation. Such a compilation is called an ``aggregate'', and this 285License does not apply to the other self-contained works thus compiled 286with the Document, on account of their being thus compiled, if they 287are not themselves derivative works of the Document. 288 289If the Cover Text requirement of section 3 is applicable to these 290copies of the Document, then if the Document is less than one quarter 291of the entire aggregate, the Document's Cover Texts may be placed on 292covers that surround only the Document within the aggregate. 293Otherwise they must appear on covers around the whole aggregate. 294@sp 1 295@item 296TRANSLATION 297 298Translation is considered a kind of modification, so you may 299distribute translations of the Document under the terms of section 4. 300Replacing Invariant Sections with translations requires special 301permission from their copyright holders, but you may include 302translations of some or all Invariant Sections in addition to the 303original versions of these Invariant Sections. You may include a 304translation of this License provided that you also include the 305original English version of this License. In case of a disagreement 306between the translation and the original English version of this 307License, the original English version will prevail. 308@sp 1 309@item 310TERMINATION 311 312You may not copy, modify, sublicense, or distribute the Document except 313as expressly provided for under this License. Any other attempt to 314copy, modify, sublicense or distribute the Document is void, and will 315automatically terminate your rights under this License. However, 316parties who have received copies, or rights, from you under this 317License will not have their licenses terminated so long as such 318parties remain in full compliance. 319@sp 1 320@item 321FUTURE REVISIONS OF THIS LICENSE 322 323The Free Software Foundation may publish new, revised versions 324of the GNU Free Documentation License from time to time. Such new 325versions will be similar in spirit to the present version, but may 326differ in detail to address new problems or concerns. See 327http://www.gnu.org/copyleft/. 328 329Each version of the License is given a distinguishing version number. 330If the Document specifies that a particular numbered version of this 331License ``or any later version'' applies to it, you have the option of 332following the terms and conditions either of that specified version or 333of any later version that has been published (not as a draft) by the 334Free Software Foundation. If the Document does not specify a version 335number of this License, you may choose any version ever published (not 336as a draft) by the Free Software Foundation. 337 338@end enumerate 339 340@unnumberedsec ADDENDUM: How to use this License for your documents 341 342To use this License in a document you have written, include a copy of 343the License in the document and put the following copyright and 344license notices just after the title page: 345 346@smallexample 347@group 348Copyright (C) @var{year} @var{your name}. 349Permission is granted to copy, distribute and/or modify this document 350under the terms of the GNU Free Documentation License, Version 1.1 351or any later version published by the Free Software Foundation; 352with the Invariant Sections being @var{list their titles}, with the 353Front-Cover Texts being @var{list}, and with the Back-Cover Texts being @var{list}. 354A copy of the license is included in the section entitled "GNU 355Free Documentation License." 356@end group 357@end smallexample 358 359If you have no Invariant Sections, write ``with no Invariant Sections'' 360instead of saying which ones are invariant. If you have no 361Front-Cover Texts, write ``no Front-Cover Texts'' instead of 362``Front-Cover Texts being @var{list}''; likewise for Back-Cover Texts. 363 364If your document contains nontrivial examples of program code, we 365recommend releasing these examples in parallel under your choice of 366free software license, such as the GNU General Public License, 367to permit their use in free software. 368