grep: GNU Free Documentation License
1
1 7.1 GNU Free Documentation License
1 ==================================
1
1 Version 1.3, 3 November 2008
1
1 Copyright © 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
1 <http://fsf.org/>
1
1 Everyone is permitted to copy and distribute verbatim copies
1 of this license document, but changing it is not allowed.
1
1 0. PREAMBLE
1
1 The purpose of this License is to make a manual, textbook, or other
1 functional and useful document “free” in the sense of freedom: to
1 assure everyone the effective freedom to copy and redistribute it,
1 with or without modifying it, either commercially or
1 noncommercially. Secondarily, this License preserves for the
1 author and publisher a way to get credit for their work, while not
1 being considered responsible for modifications made by others.
1
1 This License is a kind of “copyleft”, which means that derivative
1 works of the document must themselves be free in the same sense.
1 It complements the GNU General Public License, which is a copyleft
1 license designed for free software.
1
1 We have designed this License in order to use it for manuals for
1 free software, because free software needs free documentation: a
1 free program should come with manuals providing the same freedoms
1 that the software does. But this License is not limited to
1 software manuals; it can be used for any textual work, regardless
1 of subject matter or whether it is published as a printed book. We
1 recommend this License principally for works whose purpose is
1 instruction or reference.
1
1 1. APPLICABILITY AND DEFINITIONS
1
1 This License applies to any manual or other work, in any medium,
1 that contains a notice placed by the copyright holder saying it can
1 be distributed under the terms of this License. Such a notice
1 grants a world-wide, royalty-free license, unlimited in duration,
1 to use that work under the conditions stated herein. The
1 “Document”, below, refers to any such manual or work. Any member
1 of the public is a licensee, and is addressed as “you”. You accept
1 the license if you copy, modify or distribute the work in a way
1 requiring permission under copyright law.
1
1 A “Modified Version” of the Document means any work containing the
1 Document or a portion of it, either copied verbatim, or with
1 modifications and/or translated into another language.
1
1 A “Secondary Section” is a named appendix or a front-matter section
1 of the Document that deals exclusively with the relationship of the
1 publishers or authors of the Document to the Document’s overall
1 subject (or to related matters) and contains nothing that could
1 fall directly within that overall subject. (Thus, if the Document
1 is in part a textbook of mathematics, a Secondary Section may not
1 explain any mathematics.) The relationship could be a matter of
1 historical connection with the subject or with related matters, or
1 of legal, commercial, philosophical, ethical or political position
1 regarding them.
1
1 The “Invariant Sections” are certain Secondary Sections whose
1 titles are designated, as being those of Invariant Sections, in the
1 notice that says that the Document is released under this License.
1 If a section does not fit the above definition of Secondary then it
1 is not allowed to be designated as Invariant. The Document may
1 contain zero Invariant Sections. If the Document does not identify
1 any Invariant Sections then there are none.
1
1 The “Cover Texts” are certain short passages of text that are
1 listed, as Front-Cover Texts or Back-Cover Texts, in the notice
1 that says that the Document is released under this License. A
1 Front-Cover Text may be at most 5 words, and a Back-Cover Text may
1 be at most 25 words.
1
1 A “Transparent” copy of the Document means a machine-readable copy,
1 represented in a format whose specification is available to the
1 general public, that is suitable for revising the document
1 straightforwardly with generic text editors or (for images composed
1 of pixels) generic paint programs or (for drawings) some widely
1 available drawing editor, and that is suitable for input to text
1 formatters or for automatic translation to a variety of formats
1 suitable for input to text formatters. A copy made in an otherwise
1 Transparent file format whose markup, or absence of markup, has
1 been arranged to thwart or discourage subsequent modification by
1 readers is not Transparent. An image format is not Transparent if
1 used for any substantial amount of text. A copy that is not
1 “Transparent” is called “Opaque”.
1
1 Examples of suitable formats for Transparent copies include plain
1 ASCII without markup, Texinfo input format, LaTeX input format,
1 SGML or XML using a publicly available DTD, and standard-conforming
1 simple HTML, PostScript or PDF designed for human modification.
1 Examples of transparent image formats include PNG, XCF and JPG.
1 Opaque formats include proprietary formats that can be read and
1 edited only by proprietary word processors, SGML or XML for which
1 the DTD and/or processing tools are not generally available, and
1 the machine-generated HTML, PostScript or PDF produced by some word
1 processors for output purposes only.
1
1 The “Title Page” means, for a printed book, the title page itself,
1 plus such following pages as are needed to hold, legibly, the
1 material this License requires to appear in the title page. For
1 works in formats which do not have any title page as such, “Title
1 Page” means the text near the most prominent appearance of the
1 work’s title, preceding the beginning of the body of the text.
1
1 The “publisher” means any person or entity that distributes copies
1 of the Document to the public.
1
1 A section “Entitled XYZ” means a named subunit of the Document
1 whose title either is precisely XYZ or contains XYZ in parentheses
1 following text that translates XYZ in another language. (Here XYZ
1 stands for a specific section name mentioned below, such as
1 “Acknowledgements”, “Dedications”, “Endorsements”, or “History”.)
1 To “Preserve the Title” of such a section when you modify the
1 Document means that it remains a section “Entitled XYZ” according
1 to this definition.
1
1 The Document may include Warranty Disclaimers next to the notice
1 which states that this License applies to the Document. These
1 Warranty Disclaimers are considered to be included by reference in
1 this License, but only as regards disclaiming warranties: any other
1 implication that these Warranty Disclaimers may have is void and
1 has no effect on the meaning of this License.
1
1 2. VERBATIM COPYING
1
1 You may copy and distribute the Document in any medium, either
1 commercially or noncommercially, provided that this License, the
1 copyright notices, and the license notice saying this License
1 applies to the Document are reproduced in all copies, and that you
1 add no other conditions whatsoever to those of this License. You
1 may not use technical measures to obstruct or control the reading
1 or further copying of the copies you make or distribute. However,
1 you may accept compensation in exchange for copies. If you
1 distribute a large enough number of copies you must also follow the
1 conditions in section 3.
1
1 You may also lend copies, under the same conditions stated above,
1 and you may publicly display copies.
1
1 3. COPYING IN QUANTITY
1
1 If you publish printed copies (or copies in media that commonly
1 have printed covers) of the Document, numbering more than 100, and
1 the Document’s license notice requires Cover Texts, you must
1 enclose the copies in covers that carry, clearly and legibly, all
1 these Cover Texts: Front-Cover Texts on the front cover, and
1 Back-Cover Texts on the back cover. Both covers must also clearly
1 and legibly identify you as the publisher of these copies. The
1 front cover must present the full title with all words of the title
1 equally prominent and visible. You may add other material on the
1 covers in addition. Copying with changes limited to the covers, as
1 long as they preserve the title of the Document and satisfy these
1 conditions, can be treated as verbatim copying in other respects.
1
1 If the required texts for either cover are too voluminous to fit
1 legibly, you should put the first ones listed (as many as fit
1 reasonably) on the actual cover, and continue the rest onto
1 adjacent pages.
1
1 If you publish or distribute Opaque copies of the Document
1 numbering more than 100, you must either include a machine-readable
1 Transparent copy along with each Opaque copy, or state in or with
1 each Opaque copy a computer-network location from which the general
1 network-using public has access to download using public-standard
1 network protocols a complete Transparent copy of the Document, free
1 of added material. If you use the latter option, you must take
1 reasonably prudent steps, when you begin distribution of Opaque
1 copies in quantity, to ensure that this Transparent copy will
1 remain thus accessible at the stated location until at least one
1 year after the last time you distribute an Opaque copy (directly or
1 through your agents or retailers) of that edition to the public.
1
1 It is requested, but not required, that you contact the authors of
1 the Document well before redistributing any large number of copies,
1 to give them a chance to provide you with an updated version of the
1 Document.
1
1 4. MODIFICATIONS
1
1 You may copy and distribute a Modified Version of the Document
1 under the conditions of sections 2 and 3 above, provided that you
1 release the Modified Version under precisely this License, with the
1 Modified Version filling the role of the Document, thus licensing
1 distribution and modification of the Modified Version to whoever
1 possesses a copy of it. In addition, you must do these things in
1 the Modified Version:
1
1 A. Use in the Title Page (and on the covers, if any) a title
1 distinct from that of the Document, and from those of previous
1 versions (which should, if there were any, be listed in the
1 History section of the Document). You may use the same title
1 as a previous version if the original publisher of that
1 version gives permission.
1
1 B. List on the Title Page, as authors, one or more persons or
1 entities responsible for authorship of the modifications in
1 the Modified Version, together with at least five of the
1 principal authors of the Document (all of its principal
1 authors, if it has fewer than five), unless they release you
1 from this requirement.
1
1 C. State on the Title page the name of the publisher of the
1 Modified Version, as the publisher.
1
1 D. Preserve all the copyright notices of the Document.
1
1 E. Add an appropriate copyright notice for your modifications
1 adjacent to the other copyright notices.
1
1 F. Include, immediately after the copyright notices, a license
1 notice giving the public permission to use the Modified
1 Version under the terms of this License, in the form shown in
1 the Addendum below.
1
1 G. Preserve in that license notice the full lists of Invariant
1 Sections and required Cover Texts given in the Document’s
1 license notice.
1
1 H. Include an unaltered copy of this License.
1
1 I. Preserve the section Entitled “History”, Preserve its Title,
1 and add to it an item stating at least the title, year, new
1 authors, and publisher of the Modified Version as given on the
1 Title Page. If there is no section Entitled “History” in the
1 Document, create one stating the title, year, authors, and
1 publisher of the Document as given on its Title Page, then add
1 an item describing the Modified Version as stated in the
1 previous sentence.
1
1 J. Preserve the network location, if any, given in the Document
1 for public access to a Transparent copy of the Document, and
1 likewise the network locations given in the Document for
1 previous versions it was based on. These may be placed in the
1 “History” section. You may omit a network location for a work
1 that was published at least four years before the Document
1 itself, or if the original publisher of the version it refers
1 to gives permission.
1
1 K. For any section Entitled “Acknowledgements” or “Dedications”,
1 Preserve the Title of the section, and preserve in the section
1 all the substance and tone of each of the contributor
1 acknowledgements and/or dedications given therein.
1
1 L. Preserve all the Invariant Sections of the Document, unaltered
1 in their text and in their titles. Section numbers or the
1 equivalent are not considered part of the section titles.
1
1 M. Delete any section Entitled “Endorsements”. Such a section
1 may not be included in the Modified Version.
1
1 N. Do not retitle any existing section to be Entitled
1 “Endorsements” or to conflict in title with any Invariant
1 Section.
1
1 O. Preserve any Warranty Disclaimers.
1
1 If the Modified Version includes new front-matter sections or
1 appendices that qualify as Secondary Sections and contain no
1 material copied from the Document, you may at your option designate
1 some or all of these sections as invariant. To do this, add their
1 titles to the list of Invariant Sections in the Modified Version’s
1 license notice. These titles must be distinct from any other
1 section titles.
1
1 You may add a section Entitled “Endorsements”, provided it contains
1 nothing but endorsements of your Modified Version by various
1 parties—for example, statements of peer review or that the text has
1 been approved by an organization as the authoritative definition of
1 a standard.
1
1 You may add a passage of up to five words as a Front-Cover Text,
1 and a passage of up to 25 words as a Back-Cover Text, to the end of
1 the list of Cover Texts in the Modified Version. Only one passage
1 of Front-Cover Text and one of Back-Cover Text may be added by (or
1 through arrangements made by) any one entity. If the Document
1 already includes a cover text for the same cover, previously added
1 by you or by arrangement made by the same entity you are acting on
1 behalf of, you may not add another; but you may replace the old
1 one, on explicit permission from the previous publisher that added
1 the old one.
1
1 The author(s) and publisher(s) of the Document do not by this
1 License give permission to use their names for publicity for or to
1 assert or imply endorsement of any Modified Version.
1
1 5. COMBINING DOCUMENTS
1
1 You may combine the Document with other documents released under
1 this License, under the terms defined in section 4 above for
1 modified versions, provided that you include in the combination all
1 of the Invariant Sections of all of the original documents,
1 unmodified, and list them all as Invariant Sections of your
1 combined work in its license notice, and that you preserve all
1 their Warranty Disclaimers.
1
1 The combined work need only contain one copy of this License, and
1 multiple identical Invariant Sections may be replaced with a single
1 copy. If there are multiple Invariant Sections with the same name
1 but different contents, make the title of each such section unique
1 by adding at the end of it, in parentheses, the name of the
1 original author or publisher of that section if known, or else a
1 unique number. Make the same adjustment to the section titles in
1 the list of Invariant Sections in the license notice of the
1 combined work.
1
1 In the combination, you must combine any sections Entitled
1 “History” in the various original documents, forming one section
1 Entitled “History”; likewise combine any sections Entitled
1 “Acknowledgements”, and any sections Entitled “Dedications”. You
1 must delete all sections Entitled “Endorsements.”
1
1 6. COLLECTIONS OF DOCUMENTS
1
1 You may make a collection consisting of the Document and other
1 documents released under this License, and replace the individual
1 copies of this License in the various documents with a single copy
1 that is included in the collection, provided that you follow the
1 rules of this License for verbatim copying of each of the documents
1 in all other respects.
1
1 You may extract a single document from such a collection, and
1 distribute it individually under this License, provided you insert
1 a copy of this License into the extracted document, and follow this
1 License in all other respects regarding verbatim copying of that
1 document.
1
1 7. AGGREGATION WITH INDEPENDENT WORKS
1
1 A compilation of the Document or its derivatives with other
1 separate and independent documents or works, in or on a volume of a
1 storage or distribution medium, is called an “aggregate” if the
1 copyright resulting from the compilation is not used to limit the
1 legal rights of the compilation’s users beyond what the individual
1 works permit. When the Document is included in an aggregate, this
1 License does not apply to the other works in the aggregate which
1 are not themselves derivative works of the Document.
1
1 If the Cover Text requirement of section 3 is applicable to these
1 copies of the Document, then if the Document is less than one half
1 of the entire aggregate, the Document’s Cover Texts may be placed
1 on covers that bracket the Document within the aggregate, or the
1 electronic equivalent of covers if the Document is in electronic
1 form. Otherwise they must appear on printed covers that bracket
1 the whole aggregate.
1
1 8. TRANSLATION
1
1 Translation is considered a kind of modification, so you may
1 distribute translations of the Document under the terms of section
1 4. Replacing Invariant Sections with translations requires special
1 permission from their copyright holders, but you may include
1 translations of some or all Invariant Sections in addition to the
1 original versions of these Invariant Sections. You may include a
1 translation of this License, and all the license notices in the
1 Document, and any Warranty Disclaimers, provided that you also
1 include the original English version of this License and the
1 original versions of those notices and disclaimers. In case of a
1 disagreement between the translation and the original version of
1 this License or a notice or disclaimer, the original version will
1 prevail.
1
1 If a section in the Document is Entitled “Acknowledgements”,
1 “Dedications”, or “History”, the requirement (section 4) to
1 Preserve its Title (section 1) will typically require changing the
1 actual title.
1
1 9. TERMINATION
1
1 You may not copy, modify, sublicense, or distribute the Document
1 except as expressly provided under this License. Any attempt
1 otherwise to copy, modify, sublicense, or distribute it is void,
1 and will automatically terminate your rights under this License.
1
1 However, if you cease all violation of this License, then your
1 license from a particular copyright holder is reinstated (a)
1 provisionally, unless and until the copyright holder explicitly and
1 finally terminates your license, and (b) permanently, if the
1 copyright holder fails to notify you of the violation by some
1 reasonable means prior to 60 days after the cessation.
1
1 Moreover, your license from a particular copyright holder is
1 reinstated permanently if the copyright holder notifies you of the
1 violation by some reasonable means, this is the first time you have
1 received notice of violation of this License (for any work) from
1 that copyright holder, and you cure the violation prior to 30 days
1 after your receipt of the notice.
1
1 Termination of your rights under this section does not terminate
1 the licenses of parties who have received copies or rights from you
1 under this License. If your rights have been terminated and not
1 permanently reinstated, receipt of a copy of some or all of the
1 same material does not give you any rights to use it.
1
1 10. FUTURE REVISIONS OF THIS LICENSE
1
1 The Free Software Foundation may publish new, revised versions of
1 the GNU Free Documentation License from time to time. Such new
1 versions will be similar in spirit to the present version, but may
1 differ in detail to address new problems or concerns. See
1 <http://www.gnu.org/copyleft/>.
1
1 Each version of the License is given a distinguishing version
1 number. If the Document specifies that a particular numbered
1 version of this License “or any later version” applies to it, you
1 have the option of following the terms and conditions either of
1 that specified version or of any later version that has been
1 published (not as a draft) by the Free Software Foundation. If the
1 Document does not specify a version number of this License, you may
1 choose any version ever published (not as a draft) by the Free
1 Software Foundation. If the Document specifies that a proxy can
1 decide which future versions of this License can be used, that
1 proxy’s public statement of acceptance of a version permanently
1 authorizes you to choose that version for the Document.
1
1 11. RELICENSING
1
1 “Massive Multiauthor Collaboration Site” (or “MMC Site”) means any
1 World Wide Web server that publishes copyrightable works and also
1 provides prominent facilities for anybody to edit those works. A
1 public wiki that anybody can edit is an example of such a server.
1 A “Massive Multiauthor Collaboration” (or “MMC”) contained in the
1 site means any set of copyrightable works thus published on the MMC
1 site.
1
1 “CC-BY-SA” means the Creative Commons Attribution-Share Alike 3.0
1 license published by Creative Commons Corporation, a not-for-profit
1 corporation with a principal place of business in San Francisco,
1 California, as well as future copyleft versions of that license
1 published by that same organization.
1
1 “Incorporate” means to publish or republish a Document, in whole or
1 in part, as part of another Document.
1
1 An MMC is “eligible for relicensing” if it is licensed under this
1 License, and if all works that were first published under this
1 License somewhere other than this MMC, and subsequently
1 incorporated in whole or in part into the MMC, (1) had no cover
1 texts or invariant sections, and (2) were thus incorporated prior
1 to November 1, 2008.
1
1 The operator of an MMC Site may republish an MMC contained in the
1 site under CC-BY-SA on the same site at any time before August 1,
1 2009, provided the MMC is eligible for relicensing.
1
1 ADDENDUM: How to use this License for your documents
1 ====================================================
1
1 To use this License in a document you have written, include a copy of
1 the License in the document and put the following copyright and license
1 notices just after the title page:
1
1 Copyright (C) YEAR YOUR NAME.
1 Permission is granted to copy, distribute and/or modify this document
1 under the terms of the GNU Free Documentation License, Version 1.3
1 or any later version published by the Free Software Foundation;
1 with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
1 Texts. A copy of the license is included in the section entitled ``GNU
1 Free Documentation License''.
1
1 If you have Invariant Sections, Front-Cover Texts and Back-Cover
1 Texts, replace the “with...Texts.” line with this:
1
1 with the Invariant Sections being LIST THEIR TITLES, with
1 the Front-Cover Texts being LIST, and with the Back-Cover Texts
1 being LIST.
1
1 If you have Invariant Sections without Cover Texts, or some other
1 combination of the three, merge those two alternatives to suit the
1 situation.
1
1 If your document contains nontrivial examples of program code, we
1 recommend releasing these examples in parallel under your choice of free
1 software license, such as the GNU General Public License, to permit
1 their use in free software.
1