Wikipedia Texto de la Licencia de documentación libre de GNU

                 GNU Free Documentation License                   Version 1.3, 3 November 2008  Copyright © 2000, 2001, 2002, 2007, 2008  Free Software Foundation, Inc. <http://fsf.org/>  Everyone is permitted to copy and distribute verbatim copies of this  license document, but changing it is not allowed.  0. PREAMBLE  The purpose of this License is to make a manual, textbook, or other  functional and useful document "free" in the sense of freedom: to assure  everyone the effective freedom to copy and redistribute it, with or  without modifying it, either commercially or noncommercially. Secondarily,  this License preserves for the author and publisher a way to get credit  for their work, while not being considered responsible for modifications  made by others.  This License is a kind of "copyleft", which means that derivative works  of the document must themselves be free in the same sense. It complements  the GNU General Public License, which is a copyleft license designed for  free software.  We have designed this License in order to use it for manuals for free  software, because free software needs free documentation: a free program  should come with manuals providing the same freedoms that the software does.  But this License is not limited to software manuals; it can be used for  any textual work, regardless of subject matter or whether it is published  as a printed book. We recommend this License principally for works whose  purpose is instruction or reference.  1. APPLICABILITY AND DEFINITIONS  This License applies to any manual or other work, in any medium, that  contains a notice placed by the copyright holder saying it can be  distributed under the terms of this License. Such a notice grants  a world-wide, royalty-free license, unlimited in duration, to use that  work under the conditions stated herein. The "Document", below, refers  to any such manual or work. Any member of the public is a licensee, and  is addressed as "you". You accept the license if you copy, modify or  distribute the work in a way requiring permission under copyright law.  A "Modified Version" of the Document means any work containing the Document  or a portion of it, either copied verbatim, or with modifications and/or  translated into another language.  A "Secondary Section" is a named appendix or a front-matter section  of the Document that deals exclusively with the relationship of the  publishers or authors of the Document to the Document's overall subject  (or to related matters) and contains nothing that could fall directly  within that overall subject. (Thus, if the Document is in part a textbook  of mathematics, a Secondary Section may not explain any mathematics.)  The relationship could be a matter of historical connection with the  subject or with related matters, or of legal, commercial, philosophical,  ethical or political position regarding them.  The "Invariant Sections" are certain Secondary Sections whose titles  are designated, as being those of Invariant Sections, in the notice that  says that the Document is released under this License. If a section  does not fit the above definition of Secondary then it is not allowed  to be designated as Invariant. The Document may contain zero Invariant  Sections. If the Document does not identify any Invariant Sections then  there are none.  The "Cover Texts" are certain short passages of text that are listed,  as Front-Cover Texts or Back-Cover Texts, in the notice that says that  the Document is released under this License. A Front-Cover Text may be  at most 5 words, and a Back-Cover Text may be at most 25 words.  A "Transparent" copy of the Document means a machine-readable copy,  represented in a format whose specification is available to the general  public, that is suitable for revising the document straightforwardly  with generic text editors or (for images composed of pixels) generic  paint programs or (for drawings) some widely available drawing editor,  and that is suitable for input to text formatters or for automatic  translation to a variety of formats suitable for input to text formatters.  A copy made in an otherwise Transparent file format whose markup,  or absence of markup, has been arranged to thwart or discourage subsequent  modification by readers is not Transparent. An image format is not  Transparent if used for any substantial amount of text. A copy that is  not "Transparent" is called "Opaque".  Examples of suitable formats for Transparent copies include plain ASCII  without markup, Texinfo input format, LaTeX input format, SGML or XML  using a publicly available DTD, and standard-conforming simple HTML,  PostScript or PDF designed for human modification. Examples of transparent  image formats include PNG, XCF and JPG. Opaque formats include proprietary  formats that can be read and edited only by proprietary word processors,  SGML or XML for which the DTD and/or processing tools are not generally  available, and the machine-generated HTML, PostScript or PDF produced by  some word processors for output purposes only.  The "Title Page" means, for a printed book, the title page itself, plus  such following pages as are needed to hold, legibly, the material this  License requires to appear in the title page. For works in formats which  do not have any title page as such, "Title Page" means the text near the  most prominent appearance of the work's title, preceding the beginning  of the body of the text.  The "publisher" means any person or entity that distributes copies of  the Document to the public.  A section "Entitled XYZ" means a named subunit of the Document whose  title either is precisely XYZ or contains XYZ in parentheses following  text that translates XYZ in another language. (Here XYZ stands for a  specific section name mentioned below, such as "Acknowledgements",  "Dedications", "Endorsements", or "History".) To "Preserve the Title"  of such a section when you modify the Document means that it remains  a section "Entitled XYZ" according to this definition.  The Document may include Warranty Disclaimers next to the notice which  states that this License applies to the Document. These Warranty  Disclaimers are considered to be included by reference in this License,  but only as regards disclaiming warranties: any other implication that  these Warranty Disclaimers may have is void and has no effect on the  meaning of this License.  2. VERBATIM COPYING  You may copy and distribute the Document in any medium, either  commercially or noncommercially, provided that this License, the  copyright notices, and the license notice saying this License applies  to the Document are reproduced in all copies, and that you add no other  conditions whatsoever to those of this License. You may not use technical  measures to obstruct or control the reading or further copying of the  copies you make or distribute. However, you may accept compensation  in exchange for copies. If you distribute a large enough number of copies  you must also follow the conditions in section 3.  You may also lend copies, under the same conditions stated above, and  you may publicly display copies.  3. COPYING IN QUANTITY  If you publish printed copies (or copies in media that commonly have printed covers) of the Document, numbering more than 100, and the  Document's license notice requires Cover Texts, you must enclose the  copies in covers that carry, clearly and legibly, all these Cover Texts:  Front-Cover Texts on the front cover, and Back-Cover Texts on the back  cover. Both covers must also clearly and legibly identify you as the  publisher of these copies. The front cover must present the full title  with all words of the title equally prominent and visible. You may add  other material on the covers in addition. Copying with changes limited  to the covers, as long as they preserve the title of the Document and  satisfy these conditions, can be treated as verbatim copying in other  respects.  If the required texts for either cover are too voluminous to fit legibly,  you should put the first ones listed (as many as fit reasonably) on the  actual cover, and continue the rest onto adjacent pages.  If you publish or distribute Opaque copies of the Document numbering  more than 100, you must either include a machine-readable Transparent  copy along with each Opaque copy, or state in or with each Opaque copy  a computer-network location from which the general network-using public  has access to download using public-standard network protocols a complete  Transparent copy of the Document, free of added material. If you use the  latter option, you must take reasonably prudent steps, when you begin  distribution of Opaque copies in quantity, to ensure that this Transparent  copy will remain thus accessible at the stated location until at least  one year after the last time you distribute an Opaque copy (directly or  through your agents or retailers) of that edition to the public.  It is requested, but not required, that you contact the authors of the  Document well before redistributing any large number of copies, to give  them a chance to provide you with an updated version of the Document.  4. MODIFICATIONS  You may copy and distribute a Modified Version of the Document under the  conditions of sections 2 and 3 above, provided that you release the  Modified Version under precisely this License, with the Modified Version  filling the role of the Document, thus licensing distribution and  modification of the Modified Version to whoever possesses a copy of it.  In addition, you must do these things in the Modified Version:      * A. Use in the Title Page (and on the covers, if any) a title  distinct from that of the Document, and from those of previous versions  (which should, if there were any, be listed in the History section of the  Document). You may use the same title as a previous version if the original  publisher of that version gives permission.     * B. List on the Title Page, as authors, one or more persons or  entities responsible for authorship of the modifications in the Modified  Version, together with at least five of the principal authors of the  Document (all of its principal authors, if it has fewer than five), unless  they release you from this requirement.     * C. State on the Title page the name of the publisher of the Modified  Version, as the publisher.     * D. Preserve all the copyright notices of the Document.     * E. Add an appropriate copyright notice for your modifications  adjacent to the other copyright notices.     * F. Include, immediately after the copyright notices, a license  notice giving the public permission to use the Modified Version under the  terms of this License, in the form shown in the Addendum below.     * G. Preserve in that license notice the full lists of Invariant  Sections and required Cover Texts given in the Document's license notice.     * H. Include an unaltered copy of this License.     * I. Preserve the section Entitled "History", Preserve its Title,  and add to it an item stating at least the title, year, new authors, and  publisher of the Modified Version as given on the Title Page. If there is  no section Entitled "History" in the Document, create one stating the  title, year, authors, and publisher of the Document as given on its Title  Page, then add an item describing the Modified Version as stated in the  previous sentence.     * J. Preserve the network location, if any, given in the Document for  public access to a Transparent copy of the Document, and likewise the  network locations given in the Document for previous versions it was  based on. These may be placed in the "History" section. You may omit a  network location for a work that was published at least four years before  the Document itself, or if the original publisher of the version it refers  to gives permission.     * K. For any section Entitled "Acknowledgements" or "Dedications",  Preserve the Title of the section, and preserve in the section all the  substance and tone of each of the contributor acknowledgements and/or  dedications given therein.     * L. Preserve all the Invariant Sections of the Document, unaltered  in their text and in their titles. Section numbers or the equivalent are  not considered part of the section titles.     * M. Delete any section Entitled "Endorsements". Such a section may not be included in the Modified Version.     * N. Do not retitle any existing section to be Entitled "Endorsements"  or to conflict in title with any Invariant Section.     * O. Preserve any Warranty Disclaimers.  If the Modified Version includes new front-matter sections or appendices  that qualify as Secondary Sections and contain no material copied from  the Document, you may at your option designate some or all of these  sections as invariant. To do this, add their titles to the list of  Invariant Sections in the Modified Version's license notice. These titles  must be distinct from any other section titles.  You may add a section Entitled "Endorsements", provided it contains  nothing but endorsements of your Modified Version by various parties—for  example, statements of peer review or that the text has been approved by  an organization as the authoritative definition of a standard.  You may add a passage of up to five words as a Front-Cover Text, and  a passage of up to 25 words as a Back-Cover Text, to the end of the list  of Cover Texts in the Modified Version. Only one passage of Front-Cover  Text and one of Back-Cover Text may be added by (or through arrangements  made by) any one entity. If the Document already includes a cover text  for the same cover, previously added by you or by arrangement made by the  same entity you are acting on behalf of, you may not add another; but you  may replace the old one, on explicit permission from the previous publisher  that added the old one.  The author(s) and publisher(s) of the Document do not by this License give  permission to use their names for publicity for or to assert or imply  endorsement of any Modified Version.  5. COMBINING DOCUMENTS  You may combine the Document with other documents released under this  License, under the terms defined in section 4 above for modified versions,  provided that you include in the combination all of the Invariant Sections  of all of the original documents, unmodified, and list them all as  Invariant Sections of your combined work in its license notice, and that  you preserve all their Warranty Disclaimers.  The combined work need only contain one copy of this License, and multiple  identical Invariant Sections may be replaced with a single copy. If there  are multiple Invariant Sections with the same name but different contents,  make the title of each such section unique by adding at the end of it,  in parentheses, the name of the original author or publisher of that  section if known, or else a unique number. Make the same adjustment to  the section titles in the list of Invariant Sections in the license notice  of the combined work.  In the combination, you must combine any sections Entitled "History"  in the various original documents, forming one section Entitled "History"; likewise combine any sections Entitled "Acknowledgements", and any  sections Entitled "Dedications". You must delete all sections Entitled  "Endorsements".  6. COLLECTIONS OF DOCUMENTS  You may make a collection consisting of the Document and other documents  released under this License, and replace the individual copies of this  License in the various documents with a single copy that is included  in the collection, provided that you follow the rules of this License  for verbatim copying of each of the documents in all other respects.  You may extract a single document from such a collection, and distribute  it individually under this License, provided you insert a copy of this  License into the extracted document, and follow this License in all other  respects regarding verbatim copying of that document.  7. AGGREGATION WITH INDEPENDENT WORKS  A compilation of the Document or its derivatives with other separate and  independent documents or works, in or on a volume of a storage or  distribution medium, is called an "aggregate" if the copyright resulting  from the compilation is not used to limit the legal rights of the  compilation's users beyond what the individual works permit. When the  Document is included in an aggregate, this License does not apply to the  other works in the aggregate which are not themselves derivative works  of the Document.  If the Cover Text requirement of section 3 is applicable to these copies  of the Document, then if the Document is less than one half of the entire  aggregate, the Document's Cover Texts may be placed on covers that  bracket the Document within the aggregate, or the electronic equivalent  of covers if the Document is in electronic form. Otherwise they must  appear on printed covers that bracket the whole aggregate.  8. TRANSLATION  Translation is considered a kind of modification, so you may distribute  translations of the Document under the terms of section 4. Replacing  Invariant Sections with translations requires special permission from  their copyright holders, but you may include translations of some or all  Invariant Sections in addition to the original versions of these  Invariant Sections. You may include a translation of this License, and  all the license notices in the Document, and any Warranty Disclaimers,  provided that you also include the original English version of this  License and the original versions of those notices and disclaimers. In  case of a disagreement between the translation and the original version  of this License or a notice or disclaimer, the original version will prevail.  If a section in the Document is Entitled "Acknowledgements", "Dedications",  or "History", the requirement (section 4) to Preserve its Title (section 1)  will typically require changing the actual title.  9. TERMINATION  You may not copy, modify, sublicense, or distribute the Document except  as expressly provided under this License. Any attempt otherwise to copy,  modify, sublicense, or distribute it is void, and will automatically  terminate your rights under this License.  However, if you cease all violation of this License, then your license  from a particular copyright holder is reinstated (a) provisionally,  unless and until the copyright holder explicitly and finally terminates  your license, and (b) permanently, if the copyright holder fails to  notify you of the violation by some reasonable means prior to 60 days  after the cessation.  Moreover, your license from a particular copyright holder is reinstated  permanently if the copyright holder notifies you of the violation by some  reasonable means, this is the first time you have received notice of  violation of this License (for any work) from that copyright holder, and  you cure the violation prior to 30 days after your receipt of the notice.  Termination of your rights under this section does not terminate the  licenses of parties who have received copies or rights from you under  this License. If your rights have been terminated and not permanently  reinstated, receipt of a copy of some or all of the same material does  not give you any rights to use it.  10. FUTURE REVISIONS OF THIS LICENSE  The Free Software Foundation may publish new, revised versions of the  GNU Free Documentation License from time to time. Such new versions will  be similar in spirit to the present version, but may differ in detail  to address new problems or concerns. See http://www.gnu.org/copyleft/.  Each version of the License is given a distinguishing version number.  If the Document specifies that a particular numbered version of this  License "or any later version" applies to it, you have the option of  following the terms and conditions either of that specified version  or of any later version that has been published (not as a draft) by the  Free Software Foundation. If the Document does not specify a version  number of this License, you may choose any version ever published (not  as a draft) by the Free Software Foundation. If the Document specifies  that a proxy can decide which future versions of this License can be  used, that proxy's public statement of acceptance of a version permanently  authorizes you to choose that version for the Document.  11. RELICENSING  "Massive Multiauthor Collaboration Site" (or "MMC Site") means any World  Wide Web server that publishes copyrightable works and also provides  prominent facilities for anybody to edit those works. A public wiki that  anybody can edit is an example of such a server. A "Massive Multiauthor  Collaboration" (or "MMC") contained in the site means any set of  copyrightable works thus published on the MMC site.  "CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0 license  published by Creative Commons Corporation, a not-for-profit corporation  with a principal place of business in San Francisco, California, as well  as future copyleft versions of that license published by that same  organization.  "Incorporate" means to publish or republish a Document, in whole or in  part, as part of another Document.  An MMC is "eligible for relicensing" if it is licensed under this License,  and if all works that were first published under this License somewhere  other than this MMC, and subsequently incorporated in whole or in part  into the MMC, (1) had no cover texts or invariant sections, and (2) were  thus incorporated prior to November 1, 2008.  The operator of an MMC Site may republish an MMC contained in the site  under CC-BY-SA on the same site at any time before August 1, 2009,  provided the MMC is eligible for relicensing.  ADDENDUM: How to use this License for your documents  To use this License in a document you have written, include a copy of  the License in the document and put the following copyright and license  notices just after the title page:      Copyright (C)  YEAR  YOUR NAME.     Permission is granted to copy, distribute and/or modify this      document under the terms of the GNU Free Documentation License,      Version 1.3 or any later version published by the Free Software      Foundation; with no Invariant Sections, no Front-Cover Texts,      and no Back-Cover Texts. A copy of the license is included in      the section entitled "GNU Free Documentation License".  If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,  replace the "with … Texts." line with this:      with the Invariant Sections being LIST THEIR TITLES, with      the Front-Cover Texts being LIST, and with the Back-Cover      Texts being LIST.  If you have Invariant Sections without Cover Texts, or some other  combination of the three, merge those two alternatives to suit the situation.  If your document contains nontrivial examples of program code, we recommend  releasing these examples in parallel under your choice of free software  license, such as the GNU General Public License, to permit their use  in free software.