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   680 into proprietary programs.  If your program is a subroutine library, you
   680 into proprietary programs.  If your program is a subroutine library, you
   681 may consider it more useful to permit linking proprietary applications with
   681 may consider it more useful to permit linking proprietary applications with
   682 the library.  If this is what you want to do, use the GNU Lesser General
   682 the library.  If this is what you want to do, use the GNU Lesser General
   683 Public License instead of this License.  But first, please read
   683 Public License instead of this License.  But first, please read
   684 <>.
   684 <>.
   686 ---------------------------------------------------------------------------
   688                 GNU Free Documentation License
   689                  Version 1.3, 3 November 2008
   692  Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
   693      <>
   694  Everyone is permitted to copy and distribute verbatim copies
   695  of this license document, but changing it is not allowed.
   697 0. PREAMBLE
   699 The purpose of this License is to make a manual, textbook, or other
   700 functional and useful document "free" in the sense of freedom: to
   701 assure everyone the effective freedom to copy and redistribute it,
   702 with or without modifying it, either commercially or noncommercially.
   703 Secondarily, this License preserves for the author and publisher a way
   704 to get credit for their work, while not being considered responsible
   705 for modifications made by others.
   707 This License is a kind of "copyleft", which means that derivative
   708 works of the document must themselves be free in the same sense.  It
   709 complements the GNU General Public License, which is a copyleft
   710 license designed for free software.
   712 We have designed this License in order to use it for manuals for free
   713 software, because free software needs free documentation: a free
   714 program should come with manuals providing the same freedoms that the
   715 software does.  But this License is not limited to software manuals;
   716 it can be used for any textual work, regardless of subject matter or
   717 whether it is published as a printed book.  We recommend this License
   718 principally for works whose purpose is instruction or reference.
   723 This License applies to any manual or other work, in any medium, that
   724 contains a notice placed by the copyright holder saying it can be
   725 distributed under the terms of this License.  Such a notice grants a
   726 world-wide, royalty-free license, unlimited in duration, to use that
   727 work under the conditions stated herein.  The "Document", below,
   728 refers to any such manual or work.  Any member of the public is a
   729 licensee, and is addressed as "you".  You accept the license if you
   730 copy, modify or distribute the work in a way requiring permission
   731 under copyright law.
   733 A "Modified Version" of the Document means any work containing the
   734 Document or a portion of it, either copied verbatim, or with
   735 modifications and/or translated into another language.
   737 A "Secondary Section" is a named appendix or a front-matter section of
   738 the Document that deals exclusively with the relationship of the
   739 publishers or authors of the Document to the Document's overall
   740 subject (or to related matters) and contains nothing that could fall
   741 directly within that overall subject.  (Thus, if the Document is in
   742 part a textbook of mathematics, a Secondary Section may not explain
   743 any mathematics.)  The relationship could be a matter of historical
   744 connection with the subject or with related matters, or of legal,
   745 commercial, philosophical, ethical or political position regarding
   746 them.
   748 The "Invariant Sections" are certain Secondary Sections whose titles
   749 are designated, as being those of Invariant Sections, in the notice
   750 that says that the Document is released under this License.  If a
   751 section does not fit the above definition of Secondary then it is not
   752 allowed to be designated as Invariant.  The Document may contain zero
   753 Invariant Sections.  If the Document does not identify any Invariant
   754 Sections then there are none.
   756 The "Cover Texts" are certain short passages of text that are listed,
   757 as Front-Cover Texts or Back-Cover Texts, in the notice that says that
   758 the Document is released under this License.  A Front-Cover Text may
   759 be at most 5 words, and a Back-Cover Text may be at most 25 words.
   761 A "Transparent" copy of the Document means a machine-readable copy,
   762 represented in a format whose specification is available to the
   763 general public, that is suitable for revising the document
   764 straightforwardly with generic text editors or (for images composed of
   765 pixels) generic paint programs or (for drawings) some widely available
   766 drawing editor, and that is suitable for input to text formatters or
   767 for automatic translation to a variety of formats suitable for input
   768 to text formatters.  A copy made in an otherwise Transparent file
   769 format whose markup, or absence of markup, has been arranged to thwart
   770 or discourage subsequent modification by readers is not Transparent.
   771 An image format is not Transparent if used for any substantial amount
   772 of text.  A copy that is not "Transparent" is called "Opaque".
   774 Examples of suitable formats for Transparent copies include plain
   775 ASCII without markup, Texinfo input format, LaTeX input format, SGML
   776 or XML using a publicly available DTD, and standard-conforming simple
   777 HTML, PostScript or PDF designed for human modification.  Examples of
   778 transparent image formats include PNG, XCF and JPG.  Opaque formats
   779 include proprietary formats that can be read and edited only by
   780 proprietary word processors, SGML or XML for which the DTD and/or
   781 processing tools are not generally available, and the
   782 machine-generated HTML, PostScript or PDF produced by some word
   783 processors for output purposes only.
   785 The "Title Page" means, for a printed book, the title page itself,
   786 plus such following pages as are needed to hold, legibly, the material
   787 this License requires to appear in the title page.  For works in
   788 formats which do not have any title page as such, "Title Page" means
   789 the text near the most prominent appearance of the work's title,
   790 preceding the beginning of the body of the text.
   792 The "publisher" means any person or entity that distributes copies of
   793 the Document to the public.
   795 A section "Entitled XYZ" means a named subunit of the Document whose
   796 title either is precisely XYZ or contains XYZ in parentheses following
   797 text that translates XYZ in another language.  (Here XYZ stands for a
   798 specific section name mentioned below, such as "Acknowledgements",
   799 "Dedications", "Endorsements", or "History".)  To "Preserve the Title"
   800 of such a section when you modify the Document means that it remains a
   801 section "Entitled XYZ" according to this definition.
   803 The Document may include Warranty Disclaimers next to the notice which
   804 states that this License applies to the Document.  These Warranty
   805 Disclaimers are considered to be included by reference in this
   806 License, but only as regards disclaiming warranties: any other
   807 implication that these Warranty Disclaimers may have is void and has
   808 no effect on the meaning of this License.
   812 You may copy and distribute the Document in any medium, either
   813 commercially or noncommercially, provided that this License, the
   814 copyright notices, and the license notice saying this License applies
   815 to the Document are reproduced in all copies, and that you add no
   816 other conditions whatsoever to those of this License.  You may not use
   817 technical measures to obstruct or control the reading or further
   818 copying of the copies you make or distribute.  However, you may accept
   819 compensation in exchange for copies.  If you distribute a large enough
   820 number of copies you must also follow the conditions in section 3.
   822 You may also lend copies, under the same conditions stated above, and
   823 you may publicly display copies.
   828 If you publish printed copies (or copies in media that commonly have
   829 printed covers) of the Document, numbering more than 100, and the
   830 Document's license notice requires Cover Texts, you must enclose the
   831 copies in covers that carry, clearly and legibly, all these Cover
   832 Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on
   833 the back cover.  Both covers must also clearly and legibly identify
   834 you as the publisher of these copies.  The front cover must present
   835 the full title with all words of the title equally prominent and
   836 visible.  You may add other material on the covers in addition.
   837 Copying with changes limited to the covers, as long as they preserve
   838 the title of the Document and satisfy these conditions, can be treated
   839 as verbatim copying in other respects.
   841 If the required texts for either cover are too voluminous to fit
   842 legibly, you should put the first ones listed (as many as fit
   843 reasonably) on the actual cover, and continue the rest onto adjacent
   844 pages.
   846 If you publish or distribute Opaque copies of the Document numbering
   847 more than 100, you must either include a machine-readable Transparent
   848 copy along with each Opaque copy, or state in or with each Opaque copy
   849 a computer-network location from which the general network-using
   850 public has access to download using public-standard network protocols
   851 a complete Transparent copy of the Document, free of added material.
   852 If you use the latter option, you must take reasonably prudent steps,
   853 when you begin distribution of Opaque copies in quantity, to ensure
   854 that this Transparent copy will remain thus accessible at the stated
   855 location until at least one year after the last time you distribute an
   856 Opaque copy (directly or through your agents or retailers) of that
   857 edition to the public.
   859 It is requested, but not required, that you contact the authors of the
   860 Document well before redistributing any large number of copies, to
   861 give them a chance to provide you with an updated version of the
   862 Document.
   867 You may copy and distribute a Modified Version of the Document under
   868 the conditions of sections 2 and 3 above, provided that you release
   869 the Modified Version under precisely this License, with the Modified
   870 Version filling the role of the Document, thus licensing distribution
   871 and modification of the Modified Version to whoever possesses a copy
   872 of it.  In addition, you must do these things in the Modified Version:
   874 A. Use in the Title Page (and on the covers, if any) a title distinct
   875    from that of the Document, and from those of previous versions
   876    (which should, if there were any, be listed in the History section
   877    of the Document).  You may use the same title as a previous version
   878    if the original publisher of that version gives permission.
   879 B. List on the Title Page, as authors, one or more persons or entities
   880    responsible for authorship of the modifications in the Modified
   881    Version, together with at least five of the principal authors of the
   882    Document (all of its principal authors, if it has fewer than five),
   883    unless they release you from this requirement.
   884 C. State on the Title page the name of the publisher of the
   885    Modified Version, as the publisher.
   886 D. Preserve all the copyright notices of the Document.
   887 E. Add an appropriate copyright notice for your modifications
   888    adjacent to the other copyright notices.
   889 F. Include, immediately after the copyright notices, a license notice
   890    giving the public permission to use the Modified Version under the
   891    terms of this License, in the form shown in the Addendum below.
   892 G. Preserve in that license notice the full lists of Invariant Sections
   893    and required Cover Texts given in the Document's license notice.
   894 H. Include an unaltered copy of this License.
   895 I. Preserve the section Entitled "History", Preserve its Title, and add
   896    to it an item stating at least the title, year, new authors, and
   897    publisher of the Modified Version as given on the Title Page.  If
   898    there is no section Entitled "History" in the Document, create one
   899    stating the title, year, authors, and publisher of the Document as
   900    given on its Title Page, then add an item describing the Modified
   901    Version as stated in the previous sentence.
   902 J. Preserve the network location, if any, given in the Document for
   903    public access to a Transparent copy of the Document, and likewise
   904    the network locations given in the Document for previous versions
   905    it was based on.  These may be placed in the "History" section.
   906    You may omit a network location for a work that was published at
   907    least four years before the Document itself, or if the original
   908    publisher of the version it refers to gives permission.
   909 K. For any section Entitled "Acknowledgements" or "Dedications",
   910    Preserve the Title of the section, and preserve in the section all
   911    the substance and tone of each of the contributor acknowledgements
   912    and/or dedications given therein.
   913 L. Preserve all the Invariant Sections of the Document,
   914    unaltered in their text and in their titles.  Section numbers
   915    or the equivalent are not considered part of the section titles.
   916 M. Delete any section Entitled "Endorsements".  Such a section
   917    may not be included in the Modified Version.
   918 N. Do not retitle any existing section to be Entitled "Endorsements"
   919    or to conflict in title with any Invariant Section.
   920 O. Preserve any Warranty Disclaimers.
   922 If the Modified Version includes new front-matter sections or
   923 appendices that qualify as Secondary Sections and contain no material
   924 copied from the Document, you may at your option designate some or all
   925 of these sections as invariant.  To do this, add their titles to the
   926 list of Invariant Sections in the Modified Version's license notice.
   927 These titles must be distinct from any other section titles.
   929 You may add a section Entitled "Endorsements", provided it contains
   930 nothing but endorsements of your Modified Version by various
   931 parties--for example, statements of peer review or that the text has
   932 been approved by an organization as the authoritative definition of a
   933 standard.
   935 You may add a passage of up to five words as a Front-Cover Text, and a
   936 passage of up to 25 words as a Back-Cover Text, to the end of the list
   937 of Cover Texts in the Modified Version.  Only one passage of
   938 Front-Cover Text and one of Back-Cover Text may be added by (or
   939 through arrangements made by) any one entity.  If the Document already
   940 includes a cover text for the same cover, previously added by you or
   941 by arrangement made by the same entity you are acting on behalf of,
   942 you may not add another; but you may replace the old one, on explicit
   943 permission from the previous publisher that added the old one.
   945 The author(s) and publisher(s) of the Document do not by this License
   946 give permission to use their names for publicity for or to assert or
   947 imply endorsement of any Modified Version.
   952 You may combine the Document with other documents released under this
   953 License, under the terms defined in section 4 above for modified
   954 versions, provided that you include in the combination all of the
   955 Invariant Sections of all of the original documents, unmodified, and
   956 list them all as Invariant Sections of your combined work in its
   957 license notice, and that you preserve all their Warranty Disclaimers.
   959 The combined work need only contain one copy of this License, and
   960 multiple identical Invariant Sections may be replaced with a single
   961 copy.  If there are multiple Invariant Sections with the same name but
   962 different contents, make the title of each such section unique by
   963 adding at the end of it, in parentheses, the name of the original
   964 author or publisher of that section if known, or else a unique number.
   965 Make the same adjustment to the section titles in the list of
   966 Invariant Sections in the license notice of the combined work.
   968 In the combination, you must combine any sections Entitled "History"
   969 in the various original documents, forming one section Entitled
   970 "History"; likewise combine any sections Entitled "Acknowledgements",
   971 and any sections Entitled "Dedications".  You must delete all sections
   972 Entitled "Endorsements".
   977 You may make a collection consisting of the Document and other
   978 documents released under this License, and replace the individual
   979 copies of this License in the various documents with a single copy
   980 that is included in the collection, provided that you follow the rules
   981 of this License for verbatim copying of each of the documents in all
   982 other respects.
   984 You may extract a single document from such a collection, and
   985 distribute it individually under this License, provided you insert a
   986 copy of this License into the extracted document, and follow this
   987 License in all other respects regarding verbatim copying of that
   988 document.
   993 A compilation of the Document or its derivatives with other separate
   994 and independent documents or works, in or on a volume of a storage or
   995 distribution medium, is called an "aggregate" if the copyright
   996 resulting from the compilation is not used to limit the legal rights
   997 of the compilation's users beyond what the individual works permit.
   998 When the Document is included in an aggregate, this License does not
   999 apply to the other works in the aggregate which are not themselves
  1000 derivative works of the Document.
  1002 If the Cover Text requirement of section 3 is applicable to these
  1003 copies of the Document, then if the Document is less than one half of
  1004 the entire aggregate, the Document's Cover Texts may be placed on
  1005 covers that bracket the Document within the aggregate, or the
  1006 electronic equivalent of covers if the Document is in electronic form.
  1007 Otherwise they must appear on printed covers that bracket the whole
  1008 aggregate.
  1013 Translation is considered a kind of modification, so you may
  1014 distribute translations of the Document under the terms of section 4.
  1015 Replacing Invariant Sections with translations requires special
  1016 permission from their copyright holders, but you may include
  1017 translations of some or all Invariant Sections in addition to the
  1018 original versions of these Invariant Sections.  You may include a
  1019 translation of this License, and all the license notices in the
  1020 Document, and any Warranty Disclaimers, provided that you also include
  1021 the original English version of this License and the original versions
  1022 of those notices and disclaimers.  In case of a disagreement between
  1023 the translation and the original version of this License or a notice
  1024 or disclaimer, the original version will prevail.
  1026 If a section in the Document is Entitled "Acknowledgements",
  1027 "Dedications", or "History", the requirement (section 4) to Preserve
  1028 its Title (section 1) will typically require changing the actual
  1029 title.
  1034 You may not copy, modify, sublicense, or distribute the Document
  1035 except as expressly provided under this License.  Any attempt
  1036 otherwise to copy, modify, sublicense, or distribute it is void, and
  1037 will automatically terminate your rights under this License.
  1039 However, if you cease all violation of this License, then your license
  1040 from a particular copyright holder is reinstated (a) provisionally,
  1041 unless and until the copyright holder explicitly and finally
  1042 terminates your license, and (b) permanently, if the copyright holder
  1043 fails to notify you of the violation by some reasonable means prior to
  1044 60 days after the cessation.
  1046 Moreover, your license from a particular copyright holder is
  1047 reinstated permanently if the copyright holder notifies you of the
  1048 violation by some reasonable means, this is the first time you have
  1049 received notice of violation of this License (for any work) from that
  1050 copyright holder, and you cure the violation prior to 30 days after
  1051 your receipt of the notice.
  1053 Termination of your rights under this section does not terminate the
  1054 licenses of parties who have received copies or rights from you under
  1055 this License.  If your rights have been terminated and not permanently
  1056 reinstated, receipt of a copy of some or all of the same material does
  1057 not give you any rights to use it.
  1062 The Free Software Foundation may publish new, revised versions of the
  1063 GNU Free Documentation License from time to time.  Such new versions
  1064 will be similar in spirit to the present version, but may differ in
  1065 detail to address new problems or concerns.  See
  1068 Each version of the License is given a distinguishing version number.
  1069 If the Document specifies that a particular numbered version of this
  1070 License "or any later version" applies to it, you have the option of
  1071 following the terms and conditions either of that specified version or
  1072 of any later version that has been published (not as a draft) by the
  1073 Free Software Foundation.  If the Document does not specify a version
  1074 number of this License, you may choose any version ever published (not
  1075 as a draft) by the Free Software Foundation.  If the Document
  1076 specifies that a proxy can decide which future versions of this
  1077 License can be used, that proxy's public statement of acceptance of a
  1078 version permanently authorizes you to choose that version for the
  1079 Document.
  1081 11. RELICENSING
  1083 "Massive Multiauthor Collaboration Site" (or "MMC Site") means any
  1084 World Wide Web server that publishes copyrightable works and also
  1085 provides prominent facilities for anybody to edit those works.  A
  1086 public wiki that anybody can edit is an example of such a server.  A
  1087 "Massive Multiauthor Collaboration" (or "MMC") contained in the site
  1088 means any set of copyrightable works thus published on the MMC site.
  1090 "CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0 
  1091 license published by Creative Commons Corporation, a not-for-profit 
  1092 corporation with a principal place of business in San Francisco, 
  1093 California, as well as future copyleft versions of that license 
  1094 published by that same organization.
  1096 "Incorporate" means to publish or republish a Document, in whole or in 
  1097 part, as part of another Document.
  1099 An MMC is "eligible for relicensing" if it is licensed under this 
  1100 License, and if all works that were first published under this License 
  1101 somewhere other than this MMC, and subsequently incorporated in whole or 
  1102 in part into the MMC, (1) had no cover texts or invariant sections, and 
  1103 (2) were thus incorporated prior to November 1, 2008.
  1105 The operator of an MMC Site may republish an MMC contained in the site
  1106 under CC-BY-SA on the same site at any time before August 1, 2009,
  1107 provided the MMC is eligible for relicensing.
  1110 ADDENDUM: How to use this License for your documents
  1112 To use this License in a document you have written, include a copy of
  1113 the License in the document and put the following copyright and
  1114 license notices just after the title page:
  1116     Copyright (c)  YEAR  YOUR NAME.
  1117     Permission is granted to copy, distribute and/or modify this document
  1118     under the terms of the GNU Free Documentation License, Version 1.3
  1119     or any later version published by the Free Software Foundation;
  1120     with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
  1121     A copy of the license is included in the section entitled "GNU
  1122     Free Documentation License".
  1124 If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
  1125 replace the "with...Texts." line with this:
  1127     with the Invariant Sections being LIST THEIR TITLES, with the
  1128     Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST.
  1130 If you have Invariant Sections without Cover Texts, or some other
  1131 combination of the three, merge those two alternatives to suit the
  1132 situation.
  1134 If your document contains nontrivial examples of program code, we
  1135 recommend releasing these examples in parallel under your choice of
  1136 free software license, such as the GNU General Public License,
  1137 to permit their use in free software.