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1
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2 GNU Free Documentation License
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3 Version 1.3, 3 November 2008
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4
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5
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6 Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
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7 <http://fsf.org/>
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8 Everyone is permitted to copy and distribute verbatim copies
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9 of this license document, but changing it is not allowed.
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10
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11 0. PREAMBLE
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12
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13 The purpose of this License is to make a manual, textbook, or other
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14 functional and useful document "free" in the sense of freedom: to
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15 assure everyone the effective freedom to copy and redistribute it,
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16 with or without modifying it, either commercially or noncommercially.
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17 Secondarily, this License preserves for the author and publisher a way
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18 to get credit for their work, while not being considered responsible
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19 for modifications made by others.
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20
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21 This License is a kind of "copyleft", which means that derivative
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22 works of the document must themselves be free in the same sense. It
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23 complements the GNU General Public License, which is a copyleft
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24 license designed for free software.
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25
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26 We have designed this License in order to use it for manuals for free
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27 software, because free software needs free documentation: a free
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28 program should come with manuals providing the same freedoms that the
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29 software does. But this License is not limited to software manuals;
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30 it can be used for any textual work, regardless of subject matter or
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31 whether it is published as a printed book. We recommend this License
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32 principally for works whose purpose is instruction or reference.
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33
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34
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35 1. APPLICABILITY AND DEFINITIONS
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36
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37 This License applies to any manual or other work, in any medium, that
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38 contains a notice placed by the copyright holder saying it can be
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39 distributed under the terms of this License. Such a notice grants a
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40 world-wide, royalty-free license, unlimited in duration, to use that
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41 work under the conditions stated herein. The "Document", below,
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42 refers to any such manual or work. Any member of the public is a
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43 licensee, and is addressed as "you". You accept the license if you
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44 copy, modify or distribute the work in a way requiring permission
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45 under copyright law.
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46
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47 A "Modified Version" of the Document means any work containing the
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48 Document or a portion of it, either copied verbatim, or with
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49 modifications and/or translated into another language.
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50
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51 A "Secondary Section" is a named appendix or a front-matter section of
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52 the Document that deals exclusively with the relationship of the
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53 publishers or authors of the Document to the Document's overall
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54 subject (or to related matters) and contains nothing that could fall
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55 directly within that overall subject. (Thus, if the Document is in
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56 part a textbook of mathematics, a Secondary Section may not explain
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57 any mathematics.) The relationship could be a matter of historical
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58 connection with the subject or with related matters, or of legal,
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59 commercial, philosophical, ethical or political position regarding
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60 them.
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61
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62 The "Invariant Sections" are certain Secondary Sections whose titles
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63 are designated, as being those of Invariant Sections, in the notice
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64 that says that the Document is released under this License. If a
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65 section does not fit the above definition of Secondary then it is not
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66 allowed to be designated as Invariant. The Document may contain zero
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67 Invariant Sections. If the Document does not identify any Invariant
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68 Sections then there are none.
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69
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70 The "Cover Texts" are certain short passages of text that are listed,
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71 as Front-Cover Texts or Back-Cover Texts, in the notice that says that
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72 the Document is released under this License. A Front-Cover Text may
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73 be at most 5 words, and a Back-Cover Text may be at most 25 words.
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74
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75 A "Transparent" copy of the Document means a machine-readable copy,
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76 represented in a format whose specification is available to the
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77 general public, that is suitable for revising the document
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78 straightforwardly with generic text editors or (for images composed of
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79 pixels) generic paint programs or (for drawings) some widely available
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80 drawing editor, and that is suitable for input to text formatters or
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81 for automatic translation to a variety of formats suitable for input
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82 to text formatters. A copy made in an otherwise Transparent file
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83 format whose markup, or absence of markup, has been arranged to thwart
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84 or discourage subsequent modification by readers is not Transparent.
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85 An image format is not Transparent if used for any substantial amount
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86 of text. A copy that is not "Transparent" is called "Opaque".
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87
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88 Examples of suitable formats for Transparent copies include plain
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89 ASCII without markup, Texinfo input format, LaTeX input format, SGML
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90 or XML using a publicly available DTD, and standard-conforming simple
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91 HTML, PostScript or PDF designed for human modification. Examples of
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92 transparent image formats include PNG, XCF and JPG. Opaque formats
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93 include proprietary formats that can be read and edited only by
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94 proprietary word processors, SGML or XML for which the DTD and/or
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95 processing tools are not generally available, and the
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96 machine-generated HTML, PostScript or PDF produced by some word
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97 processors for output purposes only.
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98
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99 The "Title Page" means, for a printed book, the title page itself,
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100 plus such following pages as are needed to hold, legibly, the material
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101 this License requires to appear in the title page. For works in
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102 formats which do not have any title page as such, "Title Page" means
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103 the text near the most prominent appearance of the work's title,
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104 preceding the beginning of the body of the text.
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105
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106 The "publisher" means any person or entity that distributes copies of
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107 the Document to the public.
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108
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109 A section "Entitled XYZ" means a named subunit of the Document whose
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110 title either is precisely XYZ or contains XYZ in parentheses following
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111 text that translates XYZ in another language. (Here XYZ stands for a
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112 specific section name mentioned below, such as "Acknowledgements",
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113 "Dedications", "Endorsements", or "History".) To "Preserve the Title"
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114 of such a section when you modify the Document means that it remains a
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115 section "Entitled XYZ" according to this definition.
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116
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117 The Document may include Warranty Disclaimers next to the notice which
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118 states that this License applies to the Document. These Warranty
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119 Disclaimers are considered to be included by reference in this
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120 License, but only as regards disclaiming warranties: any other
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121 implication that these Warranty Disclaimers may have is void and has
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122 no effect on the meaning of this License.
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123
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124 2. VERBATIM COPYING
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125
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126 You may copy and distribute the Document in any medium, either
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127 commercially or noncommercially, provided that this License, the
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128 copyright notices, and the license notice saying this License applies
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129 to the Document are reproduced in all copies, and that you add no
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130 other conditions whatsoever to those of this License. You may not use
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131 technical measures to obstruct or control the reading or further
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132 copying of the copies you make or distribute. However, you may accept
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133 compensation in exchange for copies. If you distribute a large enough
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134 number of copies you must also follow the conditions in section 3.
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135
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136 You may also lend copies, under the same conditions stated above, and
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137 you may publicly display copies.
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138
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139
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140 3. COPYING IN QUANTITY
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141
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142 If you publish printed copies (or copies in media that commonly have
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143 printed covers) of the Document, numbering more than 100, and the
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144 Document's license notice requires Cover Texts, you must enclose the
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145 copies in covers that carry, clearly and legibly, all these Cover
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146 Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on
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147 the back cover. Both covers must also clearly and legibly identify
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148 you as the publisher of these copies. The front cover must present
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149 the full title with all words of the title equally prominent and
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150 visible. You may add other material on the covers in addition.
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151 Copying with changes limited to the covers, as long as they preserve
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152 the title of the Document and satisfy these conditions, can be treated
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153 as verbatim copying in other respects.
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154
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155 If the required texts for either cover are too voluminous to fit
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156 legibly, you should put the first ones listed (as many as fit
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157 reasonably) on the actual cover, and continue the rest onto adjacent
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158 pages.
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159
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160 If you publish or distribute Opaque copies of the Document numbering
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161 more than 100, you must either include a machine-readable Transparent
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162 copy along with each Opaque copy, or state in or with each Opaque copy
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163 a computer-network location from which the general network-using
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164 public has access to download using public-standard network protocols
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165 a complete Transparent copy of the Document, free of added material.
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166 If you use the latter option, you must take reasonably prudent steps,
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167 when you begin distribution of Opaque copies in quantity, to ensure
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168 that this Transparent copy will remain thus accessible at the stated
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169 location until at least one year after the last time you distribute an
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170 Opaque copy (directly or through your agents or retailers) of that
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171 edition to the public.
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172
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173 It is requested, but not required, that you contact the authors of the
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174 Document well before redistributing any large number of copies, to
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175 give them a chance to provide you with an updated version of the
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176 Document.
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177
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178
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179 4. MODIFICATIONS
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180
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181 You may copy and distribute a Modified Version of the Document under
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182 the conditions of sections 2 and 3 above, provided that you release
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183 the Modified Version under precisely this License, with the Modified
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184 Version filling the role of the Document, thus licensing distribution
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185 and modification of the Modified Version to whoever possesses a copy
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186 of it. In addition, you must do these things in the Modified Version:
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187
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188 A. Use in the Title Page (and on the covers, if any) a title distinct
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189 from that of the Document, and from those of previous versions
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190 (which should, if there were any, be listed in the History section
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191 of the Document). You may use the same title as a previous version
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192 if the original publisher of that version gives permission.
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193 B. List on the Title Page, as authors, one or more persons or entities
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194 responsible for authorship of the modifications in the Modified
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195 Version, together with at least five of the principal authors of the
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196 Document (all of its principal authors, if it has fewer than five),
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197 unless they release you from this requirement.
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198 C. State on the Title page the name of the publisher of the
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199 Modified Version, as the publisher.
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200 D. Preserve all the copyright notices of the Document.
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201 E. Add an appropriate copyright notice for your modifications
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202 adjacent to the other copyright notices.
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203 F. Include, immediately after the copyright notices, a license notice
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204 giving the public permission to use the Modified Version under the
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205 terms of this License, in the form shown in the Addendum below.
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206 G. Preserve in that license notice the full lists of Invariant Sections
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207 and required Cover Texts given in the Document's license notice.
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208 H. Include an unaltered copy of this License.
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209 I. Preserve the section Entitled "History", Preserve its Title, and add
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210 to it an item stating at least the title, year, new authors, and
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211 publisher of the Modified Version as given on the Title Page. If
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212 there is no section Entitled "History" in the Document, create one
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213 stating the title, year, authors, and publisher of the Document as
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214 given on its Title Page, then add an item describing the Modified
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215 Version as stated in the previous sentence.
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216 J. Preserve the network location, if any, given in the Document for
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217 public access to a Transparent copy of the Document, and likewise
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218 the network locations given in the Document for previous versions
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219 it was based on. These may be placed in the "History" section.
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220 You may omit a network location for a work that was published at
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221 least four years before the Document itself, or if the original
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222 publisher of the version it refers to gives permission.
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223 K. For any section Entitled "Acknowledgements" or "Dedications",
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224 Preserve the Title of the section, and preserve in the section all
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225 the substance and tone of each of the contributor acknowledgements
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226 and/or dedications given therein.
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227 L. Preserve all the Invariant Sections of the Document,
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228 unaltered in their text and in their titles. Section numbers
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229 or the equivalent are not considered part of the section titles.
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230 M. Delete any section Entitled "Endorsements". Such a section
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231 may not be included in the Modified Version.
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232 N. Do not retitle any existing section to be Entitled "Endorsements"
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233 or to conflict in title with any Invariant Section.
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234 O. Preserve any Warranty Disclaimers.
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235
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236 If the Modified Version includes new front-matter sections or
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237 appendices that qualify as Secondary Sections and contain no material
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238 copied from the Document, you may at your option designate some or all
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239 of these sections as invariant. To do this, add their titles to the
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240 list of Invariant Sections in the Modified Version's license notice.
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241 These titles must be distinct from any other section titles.
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242
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243 You may add a section Entitled "Endorsements", provided it contains
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244 nothing but endorsements of your Modified Version by various
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245 parties--for example, statements of peer review or that the text has
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246 been approved by an organization as the authoritative definition of a
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247 standard.
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248
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249 You may add a passage of up to five words as a Front-Cover Text, and a
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250 passage of up to 25 words as a Back-Cover Text, to the end of the list
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251 of Cover Texts in the Modified Version. Only one passage of
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252 Front-Cover Text and one of Back-Cover Text may be added by (or
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253 through arrangements made by) any one entity. If the Document already
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254 includes a cover text for the same cover, previously added by you or
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255 by arrangement made by the same entity you are acting on behalf of,
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256 you may not add another; but you may replace the old one, on explicit
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257 permission from the previous publisher that added the old one.
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258
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259 The author(s) and publisher(s) of the Document do not by this License
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260 give permission to use their names for publicity for or to assert or
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261 imply endorsement of any Modified Version.
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262
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263
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264 5. COMBINING DOCUMENTS
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265
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266 You may combine the Document with other documents released under this
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267 License, under the terms defined in section 4 above for modified
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268 versions, provided that you include in the combination all of the
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269 Invariant Sections of all of the original documents, unmodified, and
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270 list them all as Invariant Sections of your combined work in its
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271 license notice, and that you preserve all their Warranty Disclaimers.
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272
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273 The combined work need only contain one copy of this License, and
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274 multiple identical Invariant Sections may be replaced with a single
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275 copy. If there are multiple Invariant Sections with the same name but
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276 different contents, make the title of each such section unique by
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277 adding at the end of it, in parentheses, the name of the original
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278 author or publisher of that section if known, or else a unique number.
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279 Make the same adjustment to the section titles in the list of
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280 Invariant Sections in the license notice of the combined work.
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281
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282 In the combination, you must combine any sections Entitled "History"
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283 in the various original documents, forming one section Entitled
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284 "History"; likewise combine any sections Entitled "Acknowledgements",
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285 and any sections Entitled "Dedications". You must delete all sections
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286 Entitled "Endorsements".
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287
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288
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289 6. COLLECTIONS OF DOCUMENTS
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290
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291 You may make a collection consisting of the Document and other
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292 documents released under this License, and replace the individual
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293 copies of this License in the various documents with a single copy
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294 that is included in the collection, provided that you follow the rules
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295 of this License for verbatim copying of each of the documents in all
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296 other respects.
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297
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298 You may extract a single document from such a collection, and
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299 distribute it individually under this License, provided you insert a
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300 copy of this License into the extracted document, and follow this
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301 License in all other respects regarding verbatim copying of that
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302 document.
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303
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304
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305 7. AGGREGATION WITH INDEPENDENT WORKS
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306
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307 A compilation of the Document or its derivatives with other separate
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308 and independent documents or works, in or on a volume of a storage or
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309 distribution medium, is called an "aggregate" if the copyright
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310 resulting from the compilation is not used to limit the legal rights
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311 of the compilation's users beyond what the individual works permit.
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312 When the Document is included in an aggregate, this License does not
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313 apply to the other works in the aggregate which are not themselves
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314 derivative works of the Document.
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315
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316 If the Cover Text requirement of section 3 is applicable to these
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317 copies of the Document, then if the Document is less than one half of
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318 the entire aggregate, the Document's Cover Texts may be placed on
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319 covers that bracket the Document within the aggregate, or the
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320 electronic equivalent of covers if the Document is in electronic form.
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321 Otherwise they must appear on printed covers that bracket the whole
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322 aggregate.
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323
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324
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325 8. TRANSLATION
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326
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327 Translation is considered a kind of modification, so you may
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328 distribute translations of the Document under the terms of section 4.
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329 Replacing Invariant Sections with translations requires special
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330 permission from their copyright holders, but you may include
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331 translations of some or all Invariant Sections in addition to the
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332 original versions of these Invariant Sections. You may include a
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333 translation of this License, and all the license notices in the
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334 Document, and any Warranty Disclaimers, provided that you also include
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335 the original English version of this License and the original versions
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336 of those notices and disclaimers. In case of a disagreement between
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337 the translation and the original version of this License or a notice
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338 or disclaimer, the original version will prevail.
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339
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340 If a section in the Document is Entitled "Acknowledgements",
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341 "Dedications", or "History", the requirement (section 4) to Preserve
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342 its Title (section 1) will typically require changing the actual
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343 title.
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344
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345
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346 9. TERMINATION
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347
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348 You may not copy, modify, sublicense, or distribute the Document
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349 except as expressly provided under this License. Any attempt
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350 otherwise to copy, modify, sublicense, or distribute it is void, and
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351 will automatically terminate your rights under this License.
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352
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353 However, if you cease all violation of this License, then your license
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354 from a particular copyright holder is reinstated (a) provisionally,
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355 unless and until the copyright holder explicitly and finally
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356 terminates your license, and (b) permanently, if the copyright holder
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357 fails to notify you of the violation by some reasonable means prior to
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358 60 days after the cessation.
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359
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360 Moreover, your license from a particular copyright holder is
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361 reinstated permanently if the copyright holder notifies you of the
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362 violation by some reasonable means, this is the first time you have
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363 received notice of violation of this License (for any work) from that
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364 copyright holder, and you cure the violation prior to 30 days after
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365 your receipt of the notice.
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366
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367 Termination of your rights under this section does not terminate the
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368 licenses of parties who have received copies or rights from you under
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369 this License. If your rights have been terminated and not permanently
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370 reinstated, receipt of a copy of some or all of the same material does
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371 not give you any rights to use it.
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372
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373
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374 10. FUTURE REVISIONS OF THIS LICENSE
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375
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376 The Free Software Foundation may publish new, revised versions of the
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377 GNU Free Documentation License from time to time. Such new versions
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378 will be similar in spirit to the present version, but may differ in
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379 detail to address new problems or concerns. See
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380 http://www.gnu.org/copyleft/.
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381
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382 Each version of the License is given a distinguishing version number.
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383 If the Document specifies that a particular numbered version of this
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384 License "or any later version" applies to it, you have the option of
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385 following the terms and conditions either of that specified version or
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386 of any later version that has been published (not as a draft) by the
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387 Free Software Foundation. If the Document does not specify a version
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388 number of this License, you may choose any version ever published (not
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389 as a draft) by the Free Software Foundation. If the Document
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390 specifies that a proxy can decide which future versions of this
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391 License can be used, that proxy's public statement of acceptance of a
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392 version permanently authorizes you to choose that version for the
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393 Document.
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394
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395 11. RELICENSING
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396
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397 "Massive Multiauthor Collaboration Site" (or "MMC Site") means any
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398 World Wide Web server that publishes copyrightable works and also
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399 provides prominent facilities for anybody to edit those works. A
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400 public wiki that anybody can edit is an example of such a server. A
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401 "Massive Multiauthor Collaboration" (or "MMC") contained in the site
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402 means any set of copyrightable works thus published on the MMC site.
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403
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404 "CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0
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405 license published by Creative Commons Corporation, a not-for-profit
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406 corporation with a principal place of business in San Francisco,
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407 California, as well as future copyleft versions of that license
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408 published by that same organization.
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409
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410 "Incorporate" means to publish or republish a Document, in whole or in
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411 part, as part of another Document.
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412
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413 An MMC is "eligible for relicensing" if it is licensed under this
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414 License, and if all works that were first published under this License
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415 somewhere other than this MMC, and subsequently incorporated in whole or
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416 in part into the MMC, (1) had no cover texts or invariant sections, and
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417 (2) were thus incorporated prior to November 1, 2008.
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418
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419 The operator of an MMC Site may republish an MMC contained in the site
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420 under CC-BY-SA on the same site at any time before August 1, 2009,
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421 provided the MMC is eligible for relicensing.
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422
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423
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424 ADDENDUM: How to use this License for your documents
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425
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426 To use this License in a document you have written, include a copy of
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427 the License in the document and put the following copyright and
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428 license notices just after the title page:
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429
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430 Copyright (c) YEAR YOUR NAME.
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431 Permission is granted to copy, distribute and/or modify this document
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432 under the terms of the GNU Free Documentation License, Version 1.3
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433 or any later version published by the Free Software Foundation;
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434 with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
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435 A copy of the license is included in the section entitled "GNU
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436 Free Documentation License".
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437
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438 If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
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439 replace the "with...Texts." line with this:
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440
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441 with the Invariant Sections being LIST THEIR TITLES, with the
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442 Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST.
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443
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444 If you have Invariant Sections without Cover Texts, or some other
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445 combination of the three, merge those two alternatives to suit the
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446 situation.
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447
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448 If your document contains nontrivial examples of program code, we
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449 recommend releasing these examples in parallel under your choice of
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450 free software license, such as the GNU General Public License,
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451 to permit their use in free software.
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