1 | GNU LESSER GENERAL PUBLIC LICENSE
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2 | Version 2.1, February 1999
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3 |
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4 | Copyright (C) 1991, 1999 Free Software Foundation, Inc.
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5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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6 | Everyone is permitted to copy and distribute verbatim copies
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7 | of this license document, but changing it is not allowed.
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8 |
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9 | [This is the first released version of the Lesser GPL. It also counts
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10 | as the successor of the GNU Library Public License, version 2, hence
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11 | the version number 2.1.]
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12 |
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13 | Preamble
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14 |
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15 | The licenses for most software are designed to take away your
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16 | freedom to share and change it. By contrast, the GNU General Public
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17 | Licenses are intended to guarantee your freedom to share and change
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18 | free software--to make sure the software is free for all its users.
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19 |
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20 | This license, the Lesser General Public License, applies to some
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21 | specially designated software packages--typically libraries--of the
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22 | Free Software Foundation and other authors who decide to use it. You
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23 | can use it too, but we suggest you first think carefully about whether
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24 | this license or the ordinary General Public License is the better
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25 | strategy to use in any particular case, based on the explanations below.
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26 |
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27 | When we speak of free software, we are referring to freedom of use,
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28 | not price. Our General Public Licenses are designed to make sure that
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29 | you have the freedom to distribute copies of free software (and charge
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30 | for this service if you wish); that you receive source code or can get
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31 | it if you want it; that you can change the software and use pieces of
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32 | it in new free programs; and that you are informed that you can do
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33 | these things.
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34 |
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35 | To protect your rights, we need to make restrictions that forbid
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36 | distributors to deny you these rights or to ask you to surrender these
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37 | rights. These restrictions translate to certain responsibilities for
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38 | you if you distribute copies of the library or if you modify it.
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39 |
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40 | For example, if you distribute copies of the library, whether gratis
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41 | or for a fee, you must give the recipients all the rights that we gave
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42 | you. You must make sure that they, too, receive or can get the source
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43 | code. If you link other code with the library, you must provide
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44 | complete object files to the recipients, so that they can relink them
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45 | with the library after making changes to the library and recompiling
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46 | it. And you must show them these terms so they know their rights.
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47 |
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48 | We protect your rights with a two-step method: (1) we copyright the
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49 | library, and (2) we offer you this license, which gives you legal
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50 | permission to copy, distribute and/or modify the library.
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51 |
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52 | To protect each distributor, we want to make it very clear that
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53 | there is no warranty for the free library. Also, if the library is
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54 | modified by someone else and passed on, the recipients should know
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55 | that what they have is not the original version, so that the original
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56 | author's reputation will not be affected by problems that might be
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57 | introduced by others.
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58 |
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59 | Finally, software patents pose a constant threat to the existence of
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60 | any free program. We wish to make sure that a company cannot
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61 | effectively restrict the users of a free program by obtaining a
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62 | restrictive license from a patent holder. Therefore, we insist that
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63 | any patent license obtained for a version of the library must be
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64 | consistent with the full freedom of use specified in this license.
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65 |
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66 | Most GNU software, including some libraries, is covered by the
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67 | ordinary GNU General Public License. This license, the GNU Lesser
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68 | General Public License, applies to certain designated libraries, and
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69 | is quite different from the ordinary General Public License. We use
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70 | this license for certain libraries in order to permit linking those
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71 | libraries into non-free programs.
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72 |
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73 | When a program is linked with a library, whether statically or using
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74 | a shared library, the combination of the two is legally speaking a
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75 | combined work, a derivative of the original library. The ordinary
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76 | General Public License therefore permits such linking only if the
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77 | entire combination fits its criteria of freedom. The Lesser General
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78 | Public License permits more lax criteria for linking other code with
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79 | the library.
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80 |
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81 | We call this license the "Lesser" General Public License because it
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82 | does Less to protect the user's freedom than the ordinary General
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83 | Public License. It also provides other free software developers Less
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84 | of an advantage over competing non-free programs. These disadvantages
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85 | are the reason we use the ordinary General Public License for many
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86 | libraries. However, the Lesser license provides advantages in certain
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87 | special circumstances.
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88 |
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89 | For example, on rare occasions, there may be a special need to
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90 | encourage the widest possible use of a certain library, so that it becomes
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91 | a de-facto standard. To achieve this, non-free programs must be
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92 | allowed to use the library. A more frequent case is that a free
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93 | library does the same job as widely used non-free libraries. In this
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94 | case, there is little to gain by limiting the free library to free
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95 | software only, so we use the Lesser General Public License.
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96 |
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97 | In other cases, permission to use a particular library in non-free
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98 | programs enables a greater number of people to use a large body of
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99 | free software. For example, permission to use the GNU C Library in
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100 | non-free programs enables many more people to use the whole GNU
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101 | operating system, as well as its variant, the GNU/Linux operating
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102 | system.
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103 |
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104 | Although the Lesser General Public License is Less protective of the
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105 | users' freedom, it does ensure that the user of a program that is
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106 | linked with the Library has the freedom and the wherewithal to run
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107 | that program using a modified version of the Library.
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108 |
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109 | The precise terms and conditions for copying, distribution and
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110 | modification follow. Pay close attention to the difference between a
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111 | "work based on the library" and a "work that uses the library". The
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112 | former contains code derived from the library, whereas the latter must
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113 | be combined with the library in order to run.
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114 |
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115 | GNU LESSER GENERAL PUBLIC LICENSE
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116 | TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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117 |
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118 | 0. This License Agreement applies to any software library or other
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119 | program which contains a notice placed by the copyright holder or
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120 | other authorized party saying it may be distributed under the terms of
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121 | this Lesser General Public License (also called "this License").
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122 | Each licensee is addressed as "you".
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123 |
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124 | A "library" means a collection of software functions and/or data
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125 | prepared so as to be conveniently linked with application programs
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126 | (which use some of those functions and data) to form executables.
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127 |
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128 | The "Library", below, refers to any such software library or work
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129 | which has been distributed under these terms. A "work based on the
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130 | Library" means either the Library or any derivative work under
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131 | copyright law: that is to say, a work containing the Library or a
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132 | portion of it, either verbatim or with modifications and/or translated
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133 | straightforwardly into another language. (Hereinafter, translation is
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134 | included without limitation in the term "modification".)
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135 |
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136 | "Source code" for a work means the preferred form of the work for
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137 | making modifications to it. For a library, complete source code means
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138 | all the source code for all modules it contains, plus any associated
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139 | interface definition files, plus the scripts used to control compilation
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140 | and installation of the library.
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141 |
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142 | Activities other than copying, distribution and modification are not
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143 | covered by this License; they are outside its scope. The act of
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144 | running a program using the Library is not restricted, and output from
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145 | such a program is covered only if its contents constitute a work based
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146 | on the Library (independent of the use of the Library in a tool for
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147 | writing it). Whether that is true depends on what the Library does
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148 | and what the program that uses the Library does.
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149 |
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150 | 1. You may copy and distribute verbatim copies of the Library's
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151 | complete source code as you receive it, in any medium, provided that
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152 | you conspicuously and appropriately publish on each copy an
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153 | appropriate copyright notice and disclaimer of warranty; keep intact
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154 | all the notices that refer to this License and to the absence of any
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155 | warranty; and distribute a copy of this License along with the
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156 | Library.
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157 |
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158 | You may charge a fee for the physical act of transferring a copy,
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159 | and you may at your option offer warranty protection in exchange for a
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160 | fee.
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161 |
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162 | 2. You may modify your copy or copies of the Library or any portion
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163 | of it, thus forming a work based on the Library, and copy and
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164 | distribute such modifications or work under the terms of Section 1
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165 | above, provided that you also meet all of these conditions:
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166 |
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167 | a) The modified work must itself be a software library.
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168 |
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169 | b) You must cause the files modified to carry prominent notices
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170 | stating that you changed the files and the date of any change.
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171 |
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172 | c) You must cause the whole of the work to be licensed at no
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173 | charge to all third parties under the terms of this License.
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174 |
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175 | d) If a facility in the modified Library refers to a function or a
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176 | table of data to be supplied by an application program that uses
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177 | the facility, other than as an argument passed when the facility
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178 | is invoked, then you must make a good faith effort to ensure that,
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179 | in the event an application does not supply such function or
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180 | table, the facility still operates, and performs whatever part of
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181 | its purpose remains meaningful.
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182 |
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183 | (For example, a function in a library to compute square roots has
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184 | a purpose that is entirely well-defined independent of the
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185 | application. Therefore, Subsection 2d requires that any
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186 | application-supplied function or table used by this function must
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187 | be optional: if the application does not supply it, the square
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188 | root function must still compute square roots.)
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189 |
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190 | These requirements apply to the modified work as a whole. If
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191 | identifiable sections of that work are not derived from the Library,
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192 | and can be reasonably considered independent and separate works in
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193 | themselves, then this License, and its terms, do not apply to those
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194 | sections when you distribute them as separate works. But when you
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195 | distribute the same sections as part of a whole which is a work based
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196 | on the Library, the distribution of the whole must be on the terms of
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197 | this License, whose permissions for other licensees extend to the
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198 | entire whole, and thus to each and every part regardless of who wrote
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199 | it.
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200 |
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201 | Thus, it is not the intent of this section to claim rights or contest
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202 | your rights to work written entirely by you; rather, the intent is to
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203 | exercise the right to control the distribution of derivative or
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204 | collective works based on the Library.
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205 |
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206 | In addition, mere aggregation of another work not based on the Library
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207 | with the Library (or with a work based on the Library) on a volume of
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208 | a storage or distribution medium does not bring the other work under
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209 | the scope of this License.
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210 |
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211 | 3. You may opt to apply the terms of the ordinary GNU General Public
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212 | License instead of this License to a given copy of the Library. To do
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213 | this, you must alter all the notices that refer to this License, so
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214 | that they refer to the ordinary GNU General Public License, version 2,
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215 | instead of to this License. (If a newer version than version 2 of the
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216 | ordinary GNU General Public License has appeared, then you can specify
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217 | that version instead if you wish.) Do not make any other change in
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218 | these notices.
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219 |
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220 | Once this change is made in a given copy, it is irreversible for
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221 | that copy, so the ordinary GNU General Public License applies to all
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222 | subsequent copies and derivative works made from that copy.
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223 |
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224 | This option is useful when you wish to copy part of the code of
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225 | the Library into a program that is not a library.
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226 |
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227 | 4. You may copy and distribute the Library (or a portion or
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228 | derivative of it, under Section 2) in object code or executable form
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229 | under the terms of Sections 1 and 2 above provided that you accompany
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230 | it with the complete corresponding machine-readable source code, which
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231 | must be distributed under the terms of Sections 1 and 2 above on a
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232 | medium customarily used for software interchange.
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233 |
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234 | If distribution of object code is made by offering access to copy
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235 | from a designated place, then offering equivalent access to copy the
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236 | source code from the same place satisfies the requirement to
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237 | distribute the source code, even though third parties are not
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238 | compelled to copy the source along with the object code.
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239 |
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240 | 5. A program that contains no derivative of any portion of the
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241 | Library, but is designed to work with the Library by being compiled or
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242 | linked with it, is called a "work that uses the Library". Such a
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243 | work, in isolation, is not a derivative work of the Library, and
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244 | therefore falls outside the scope of this License.
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245 |
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246 | However, linking a "work that uses the Library" with the Library
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247 | creates an executable that is a derivative of the Library (because it
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248 | contains portions of the Library), rather than a "work that uses the
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249 | library". The executable is therefore covered by this License.
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250 | Section 6 states terms for distribution of such executables.
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251 |
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252 | When a "work that uses the Library" uses material from a header file
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253 | that is part of the Library, the object code for the work may be a
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254 | derivative work of the Library even though the source code is not.
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255 | Whether this is true is especially significant if the work can be
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256 | linked without the Library, or if the work is itself a library. The
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257 | threshold for this to be true is not precisely defined by law.
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258 |
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259 | If such an object file uses only numerical parameters, data
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260 | structure layouts and accessors, and small macros and small inline
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261 | functions (ten lines or less in length), then the use of the object
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262 | file is unrestricted, regardless of whether it is legally a derivative
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263 | work. (Executables containing this object code plus portions of the
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264 | Library will still fall under Section 6.)
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265 |
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266 | Otherwise, if the work is a derivative of the Library, you may
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267 | distribute the object code for the work under the terms of Section 6.
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268 | Any executables containing that work also fall under Section 6,
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269 | whether or not they are linked directly with the Library itself.
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270 |
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271 | 6. As an exception to the Sections above, you may also combine or
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272 | link a "work that uses the Library" with the Library to produce a
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273 | work containing portions of the Library, and distribute that work
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274 | under terms of your choice, provided that the terms permit
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275 | modification of the work for the customer's own use and reverse
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276 | engineering for debugging such modifications.
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277 |
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278 | You must give prominent notice with each copy of the work that the
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279 | Library is used in it and that the Library and its use are covered by
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280 | this License. You must supply a copy of this License. If the work
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281 | during execution displays copyright notices, you must include the
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282 | copyright notice for the Library among them, as well as a reference
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283 | directing the user to the copy of this License. Also, you must do one
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284 | of these things:
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285 |
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286 | a) Accompany the work with the complete corresponding
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287 | machine-readable source code for the Library including whatever
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288 | changes were used in the work (which must be distributed under
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289 | Sections 1 and 2 above); and, if the work is an executable linked
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290 | with the Library, with the complete machine-readable "work that
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291 | uses the Library", as object code and/or source code, so that the
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292 | user can modify the Library and then relink to produce a modified
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293 | executable containing the modified Library. (It is understood
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294 | that the user who changes the contents of definitions files in the
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295 | Library will not necessarily be able to recompile the application
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296 | to use the modified definitions.)
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297 |
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298 | b) Use a suitable shared library mechanism for linking with the
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299 | Library. A suitable mechanism is one that (1) uses at run time a
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300 | copy of the library already present on the user's computer system,
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301 | rather than copying library functions into the executable, and (2)
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302 | will operate properly with a modified version of the library, if
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303 | the user installs one, as long as the modified version is
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304 | interface-compatible with the version that the work was made with.
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305 |
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306 | c) Accompany the work with a written offer, valid for at
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307 | least three years, to give the same user the materials
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308 | specified in Subsection 6a, above, for a charge no more
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309 | than the cost of performing this distribution.
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310 |
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311 | d) If distribution of the work is made by offering access to copy
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312 | from a designated place, offer equivalent access to copy the above
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313 | specified materials from the same place.
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314 |
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315 | e) Verify that the user has already received a copy of these
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316 | materials or that you have already sent this user a copy.
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317 |
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318 | For an executable, the required form of the "work that uses the
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319 | Library" must include any data and utility programs needed for
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320 | reproducing the executable from it. However, as a special exception,
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321 | the materials to be distributed need not include anything that is
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322 | normally distributed (in either source or binary form) with the major
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323 | components (compiler, kernel, and so on) of the operating system on
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324 | which the executable runs, unless that component itself accompanies
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325 | the executable.
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326 |
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327 | It may happen that this requirement contradicts the license
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328 | restrictions of other proprietary libraries that do not normally
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329 | accompany the operating system. Such a contradiction means you cannot
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330 | use both them and the Library together in an executable that you
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331 | distribute.
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332 |
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333 | 7. You may place library facilities that are a work based on the
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334 | Library side-by-side in a single library together with other library
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335 | facilities not covered by this License, and distribute such a combined
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336 | library, provided that the separate distribution of the work based on
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337 | the Library and of the other library facilities is otherwise
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338 | permitted, and provided that you do these two things:
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339 |
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340 | a) Accompany the combined library with a copy of the same work
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341 | based on the Library, uncombined with any other library
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342 | facilities. This must be distributed under the terms of the
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343 | Sections above.
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344 |
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345 | b) Give prominent notice with the combined library of the fact
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346 | that part of it is a work based on the Library, and explaining
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347 | where to find the accompanying uncombined form of the same work.
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348 |
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349 | 8. You may not copy, modify, sublicense, link with, or distribute
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350 | the Library except as expressly provided under this License. Any
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351 | attempt otherwise to copy, modify, sublicense, link with, or
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352 | distribute the Library is void, and will automatically terminate your
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354 | or rights, from you under this License will not have their licenses
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355 | terminated so long as such parties remain in full compliance.
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356 |
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357 | 9. You are not required to accept this License, since you have not
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358 | signed it. However, nothing else grants you permission to modify or
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359 | distribute the Library or its derivative works. These actions are
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360 | prohibited by law if you do not accept this License. Therefore, by
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361 | modifying or distributing the Library (or any work based on the
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363 | all its terms and conditions for copying, distributing or modifying
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364 | the Library or works based on it.
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365 |
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366 | 10. Each time you redistribute the Library (or any work based on the
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367 | Library), the recipient automatically receives a license from the
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370 | restrictions on the recipients' exercise of the rights granted herein.
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371 | You are not responsible for enforcing compliance by third parties with
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372 | this License.
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373 |
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374 | 11. If, as a consequence of a court judgment or allegation of patent
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375 | infringement or for any other reason (not limited to patent issues),
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376 | conditions are imposed on you (whether by court order, agreement or
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377 | otherwise) that contradict the conditions of this License, they do not
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378 | excuse you from the conditions of this License. If you cannot
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379 | distribute so as to satisfy simultaneously your obligations under this
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380 | License and any other pertinent obligations, then as a consequence you
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381 | may not distribute the Library at all. For example, if a patent
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382 | license would not permit royalty-free redistribution of the Library by
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383 | all those who receive copies directly or indirectly through you, then
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384 | the only way you could satisfy both it and this License would be to
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385 | refrain entirely from distribution of the Library.
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386 |
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387 | If any portion of this section is held invalid or unenforceable under any
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388 | particular circumstance, the balance of the section is intended to apply,
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389 | and the section as a whole is intended to apply in other circumstances.
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390 |
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391 | It is not the purpose of this section to induce you to infringe any
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392 | patents or other property right claims or to contest validity of any
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393 | such claims; this section has the sole purpose of protecting the
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394 | integrity of the free software distribution system which is
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395 | implemented by public license practices. Many people have made
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397 | through that system in reliance on consistent application of that
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399 | to distribute software through any other system and a licensee cannot
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400 | impose that choice.
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401 |
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402 | This section is intended to make thoroughly clear what is believed to
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403 | be a consequence of the rest of this License.
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404 |
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405 | 12. If the distribution and/or use of the Library is restricted in
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406 | certain countries either by patents or by copyrighted interfaces, the
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407 | original copyright holder who places the Library under this License may add
|
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408 | an explicit geographical distribution limitation excluding those countries,
|
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409 | so that distribution is permitted only in or among countries not thus
|
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410 | excluded. In such case, this License incorporates the limitation as if
|
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411 | written in the body of this License.
|
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412 |
|
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413 | 13. The Free Software Foundation may publish revised and/or new
|
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414 | versions of the Lesser General Public License from time to time.
|
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415 | Such new versions will be similar in spirit to the present version,
|
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416 | but may differ in detail to address new problems or concerns.
|
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417 |
|
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418 | Each version is given a distinguishing version number. If the Library
|
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419 | specifies a version number of this License which applies to it and
|
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420 | "any later version", you have the option of following the terms and
|
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421 | conditions either of that version or of any later version published by
|
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422 | the Free Software Foundation. If the Library does not specify a
|
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423 | license version number, you may choose any version ever published by
|
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424 | the Free Software Foundation.
|
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425 |
|
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426 | 14. If you wish to incorporate parts of the Library into other free
|
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427 | programs whose distribution conditions are incompatible with these,
|
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428 | write to the author to ask for permission. For software which is
|
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429 | copyrighted by the Free Software Foundation, write to the Free
|
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430 | Software Foundation; we sometimes make exceptions for this. Our
|
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431 | decision will be guided by the two goals of preserving the free status
|
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432 | of all derivatives of our free software and of promoting the sharing
|
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433 | and reuse of software generally.
|
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434 |
|
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435 | NO WARRANTY
|
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436 |
|
---|
437 | 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
|
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438 | WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
|
---|
439 | EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
|
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440 | OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
|
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441 | KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
|
---|
442 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
---|
443 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
|
---|
444 | LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
|
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445 | THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
|
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446 |
|
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447 | 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
|
---|
448 | WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
|
---|
449 | AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
|
---|
450 | FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
|
---|
451 | CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
|
---|
452 | LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
|
---|
453 | RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
|
---|
454 | FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
|
---|
455 | SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
|
---|
456 | DAMAGES.
|
---|
457 |
|
---|
458 | END OF TERMS AND CONDITIONS
|
---|
459 |
|
---|
460 | How to Apply These Terms to Your New Libraries
|
---|
461 |
|
---|
462 | If you develop a new library, and you want it to be of the greatest
|
---|
463 | possible use to the public, we recommend making it free software that
|
---|
464 | everyone can redistribute and change. You can do so by permitting
|
---|
465 | redistribution under these terms (or, alternatively, under the terms of the
|
---|
466 | ordinary General Public License).
|
---|
467 |
|
---|
468 | To apply these terms, attach the following notices to the library. It is
|
---|
469 | safest to attach them to the start of each source file to most effectively
|
---|
470 | convey the exclusion of warranty; and each file should have at least the
|
---|
471 | "copyright" line and a pointer to where the full notice is found.
|
---|
472 |
|
---|
473 | <one line to give the library's name and a brief idea of what it does.>
|
---|
474 | Copyright (C) <year> <name of author>
|
---|
475 |
|
---|
476 | This library is free software; you can redistribute it and/or
|
---|
477 | modify it under the terms of the GNU Lesser General Public
|
---|
478 | License as published by the Free Software Foundation; either
|
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479 | version 2.1 of the License, or (at your option) any later version.
|
---|
480 |
|
---|
481 | This library is distributed in the hope that it will be useful,
|
---|
482 | but WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
483 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
---|
484 | Lesser General Public License for more details.
|
---|
485 |
|
---|
486 | You should have received a copy of the GNU Lesser General Public
|
---|
487 | License along with this library; if not, write to the Free Software
|
---|
488 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
---|
489 |
|
---|
490 | Also add information on how to contact you by electronic and paper mail.
|
---|
491 |
|
---|
492 | You should also get your employer (if you work as a programmer) or your
|
---|
493 | school, if any, to sign a "copyright disclaimer" for the library, if
|
---|
494 | necessary. Here is a sample; alter the names:
|
---|
495 |
|
---|
496 | Yoyodyne, Inc., hereby disclaims all copyright interest in the
|
---|
497 | library `Frob' (a library for tweaking knobs) written by James Random Hacker.
|
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498 |
|
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499 | <signature of Ty Coon>, 1 April 1990
|
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500 | Ty Coon, President of Vice
|
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501 |
|
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502 | That's all there is to it!
|
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