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 for GFDL
From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :

         GNU Free Documentation License (GNU)

From The Free On-line Dictionary of Computing (30 December 2018) :

  GNU Free Documentation License
      (GFDL) The Free Software Foundation's license
     designed to ensure the same freedoms for documentation that
     the GPL gives to software.
     This dictionary is distributed under the GFDL, see the
     copyright notice in the Free On-line Dictionary of Computing
     section (at the start of the source file).  The full text
     Version 1.1, March 2000
     Copyright 2000 Free Software Foundation, Inc.
     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
     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 written 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
     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
     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
     This License applies to any manual or other work that contains
     a notice placed by the copyright holder saying it can be
     distributed under the terms of this License.  The "Document",
     below, refers to any such manual or work.  Any member of the
     public is a licensee, and is addressed as "you".
     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.  (For example, 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.
     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
     A "Transparent" copy of the Document means a machine-readable
     copy, represented in a format whose specification is available
     to the general public, whose contents can be viewed and edited
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     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 has been designed to thwart or discourage
     subsequent modification by readers is not Transparent.  A copy
     that is not "Transparent" is called "Opaque".
     Examples of suitable formats for Transparent copies include
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     format, SGML or XML using a publicly available DTD, and
     standard-conforming simple HTML designed for human
     modification.  Opaque formats include PostScript, PDF,
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     proprietary word processors, SGML or XML for which the DTD
     and/or processing tools are not generally available, and the
     machine-generated HTML 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.
     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.
     If you publish printed copies 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
     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 publicly-accessible
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     copy of the Document, free of added material, which the
     general network-using public has access to download
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     protocols.  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.
     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 less than five).
     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", and 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. In any section entitled "Acknowledgements" or
     "Dedications", preserve the section's title, 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
     M. Delete any section entitled "Endorsements".  Such a section
     may not be included in the Modified Version.
     N. Do not retitle any existing section as "Endorsements" or to
     conflict in title with any Invariant Section.  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.
     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.
     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
     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
     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.
     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, does not as a whole count
     as a Modified Version of the Document, provided no compilation
     copyright is claimed for the compilation.  Such a compilation
     is called an "aggregate", and this License does not apply to
     the other self-contained works thus compiled with the
     Document, on account of their being thus compiled, if they 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 quarter of the entire aggregate, the Document's Cover
     Texts may be placed on covers that surround only the Document
     within the aggregate.  Otherwise they must appear on covers
     around the whole aggregate.
     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
     provided that you also include the original English version of
     this License.  In case of a disagreement between the
     translation and the original English version of this License,
     the original English version will prevail.
     You may not copy, modify, sublicense, or distribute the
     Document except as expressly provided for under this
     License.  Any other attempt to copy, modify, sublicense or
     distribute the Document is void, and will automatically
     terminate your rights under this License.  However, parties who
     have received copies, or rights, from you under this License
     will not have their licenses terminated so long as such
     parties remain in full compliance.
     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://gnu.org/copyleft/)">here (http://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.
     End of full text of GFDL.

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