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1 This library is free software; you can redistribute it and/or
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2 modify it under the terms of the GNU Library General Public
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3 License version 2 as published by the Free Software Foundation.
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4
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5 This library is distributed in the hope that it will be useful,
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6 but WITHOUT ANY WARRANTY; without even the implied warranty of
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7 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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8
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9 GNU Library General Public License
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10
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11 ----------------------------------------------------------------------------
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12
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13 Table of Contents
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14
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15 * GNU LIBRARY GENERAL PUBLIC LICENSE
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16 o Preamble
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17 o TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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18
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19 ----------------------------------------------------------------------------
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20
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21 GNU LIBRARY GENERAL PUBLIC LICENSE
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22
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23 Version 2, June 1991
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24
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25 Copyright (C) 1991 Free Software Foundation, Inc.
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26 675 Mass Ave, Cambridge, MA 02139, USA
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27 Everyone is permitted to copy and distribute verbatim copies
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28 of this license document, but changing it is not allowed.
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29
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30 [This is the first released version of the library GPL. It is
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31 numbered 2 because it goes with version 2 of the ordinary GPL.]
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32
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33 Preamble
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34
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35 The licenses for most software are designed to take away your freedom to
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36 share and change it. By contrast, the GNU General Public Licenses are
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37 intended to guarantee your freedom to share and change free software--to
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38 make sure the software is free for all its users.
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39
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40 This license, the Library General Public License, applies to some specially
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41 designated Free Software Foundation software, and to any other libraries
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42 whose authors decide to use it. You can use it for your libraries, too.
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43
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44 When we speak of free software, we are referring to freedom, not price. Our
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45 General Public Licenses are designed to make sure that you have the freedom
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46 to distribute copies of free software (and charge for this service if you
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47 wish), that you receive source code or can get it if you want it, that you
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48 can change the software or use pieces of it in new free programs; and that
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49 you know you can do these things.
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50
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51 To protect your rights, we need to make restrictions that forbid anyone to
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52 deny you these rights or to ask you to surrender the rights. These
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53 restrictions translate to certain responsibilities for you if you distribute
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54 copies of the library, or if you modify it.
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55
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56 For example, if you distribute copies of the library, whether gratis or for
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57 a fee, you must give the recipients all the rights that we gave you. You
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58 must make sure that they, too, receive or can get the source code. If you
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59 link a program with the library, you must provide complete object files to
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60 the recipients so that they can relink them with the library, after making
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61 changes to the library and recompiling it. And you must show them these
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62 terms so they know their rights.
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63
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64 Our method of protecting your rights has two steps: (1) copyright the
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65 library, and (2) offer you this license which gives you legal permission to
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66 copy, distribute and/or modify the library.
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67
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68 Also, for each distributor's protection, we want to make certain that
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69 everyone understands that there is no warranty for this free library. If the
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70 library is modified by someone else and passed on, we want its recipients to
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71 know that what they have is not the original version, so that any problems
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72 introduced by others will not reflect on the original authors' reputations.
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73
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74 Finally, any free program is threatened constantly by software patents. We
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75 wish to avoid the danger that companies distributing free software will
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76 individually obtain patent licenses, thus in effect transforming the program
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77 into proprietary software. To prevent this, we have made it clear that any
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78 patent must be licensed for everyone's free use or not licensed at all.
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79
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80 Most GNU software, including some libraries, is covered by the ordinary GNU
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81 General Public License, which was designed for utility programs. This
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82 license, the GNU Library General Public License, applies to certain
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83 designated libraries. This license is quite different from the ordinary one;
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84 be sure to read it in full, and don't assume that anything in it is the same
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85 as in the ordinary license.
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86
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87 The reason we have a separate public license for some libraries is that they
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88 blur the distinction we usually make between modifying or adding to a
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89 program and simply using it. Linking a program with a library, without
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90 changing the library, is in some sense simply using the library, and is
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91 analogous to running a utility program or application program. However, in a
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92 textual and legal sense, the linked executable is a combined work, a
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93 derivative of the original library, and the ordinary General Public License
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94 treats it as such.
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95
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96 Because of this blurred distinction, using the ordinary General Public
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97 License for libraries did not effectively promote software sharing, because
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98 most developers did not use the libraries. We concluded that weaker
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99 conditions might promote sharing better.
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100
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101 However, unrestricted linking of non-free programs would deprive the users
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102 of those programs of all benefit from the free status of the libraries
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103 themselves. This Library General Public License is intended to permit
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104 developers of non-free programs to use free libraries, while preserving your
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105 freedom as a user of such programs to change the free libraries that are
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106 incorporated in them. (We have not seen how to achieve this as regards
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107 changes in header files, but we have achieved it as regards changes in the
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108 actual functions of the Library.) The hope is that this will lead to faster
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109 development of free libraries.
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110
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111 The precise terms and conditions for copying, distribution and modification
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112 follow. Pay close attention to the difference between a "work based on the
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113 library" and a "work that uses the library". The former contains code
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114 derived from the library, while the latter only works together with the
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115 library.
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116
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117 Note that it is possible for a library to be covered by the ordinary General
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118 Public License rather than by this special one.
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119
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120 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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121
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122 0. This License Agreement applies to any software library which contains a
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123 notice placed by the copyright holder or other authorized party saying it
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124 may be distributed under the terms of this Library General Public License
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125 (also called "this License"). Each licensee is addressed as "you".
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126
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127 A "library" means a collection of software functions and/or data prepared so
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128 as to be conveniently linked with application programs (which use some of
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129 those functions and data) to form executables.
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130
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131 The "Library", below, refers to any such software library or work which has
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132 been distributed under these terms. A "work based on the Library" means
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133 either the Library or any derivative work under copyright law: that is to
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134 say, a work containing the Library or a portion of it, either verbatim or
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135 with modifications and/or translated straightforwardly into another
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136 language. (Hereinafter, translation is included without limitation in the
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137 term "modification".)
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138
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139 "Source code" for a work means the preferred form of the work for making
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140 modifications to it. For a library, complete source code means all the
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141 source code for all modules it contains, plus any associated interface
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142 definition files, plus the scripts used to control compilation and
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143 installation of the library.
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144
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145 Activities other than copying, distribution and modification are not covered
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146 by this License; they are outside its scope. The act of running a program
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147 using the Library is not restricted, and output from such a program is
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148 covered only if its contents constitute a work based on the Library
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149 (independent of the use of the Library in a tool for writing it). Whether
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150 that is true depends on what the Library does and what the program that uses
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151 the Library does.
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152
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153 1. You may copy and distribute verbatim copies of the Library's complete
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154 source code as you receive it, in any medium, provided that you
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155 conspicuously and appropriately publish on each copy an appropriate
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156 copyright notice and disclaimer of warranty; keep intact all the notices
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158 distribute a copy of this License along with the Library.
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159
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160 You may charge a fee for the physical act of transferring a copy, and you
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161 may at your option offer warranty protection in exchange for a fee.
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162
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163 2. You may modify your copy or copies of the Library or any portion of it,
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164 thus forming a work based on the Library, and copy and distribute such
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165 modifications or work under the terms of Section 1 above, provided that you
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166 also meet all of these conditions:
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167
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168 o a) The modified work must itself be a software library.
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169
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170 o b) You must cause the files modified to carry prominent notices
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171 stating that you changed the files and the date of any change.
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172
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173 o c) You must cause the whole of the work to be licensed at no
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174 charge to all third parties under the terms of this License.
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175
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176 o d) If a facility in the modified Library refers to a function or a
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177 table of data to be supplied by an application program that uses
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178 the facility, other than as an argument passed when the facility
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179 is invoked, then you must make a good faith effort to ensure that,
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180 in the event an application does not supply such function or
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181 table, the facility still operates, and performs whatever part of
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182 its purpose remains meaningful.
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183
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184 (For example, a function in a library to compute square roots has
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185 a purpose that is entirely well-defined independent of the
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186 application. Therefore, Subsection 2d requires that any
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187 application-supplied function or table used by this function must
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188 be optional: if the application does not supply it, the square
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189 root function must still compute square roots.)
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190
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191 These requirements apply to the modified work as a whole. If identifiable
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192 sections of that work are not derived from the Library, and can be
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193 reasonably considered independent and separate works in themselves, then
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194 this License, and its terms, do not apply to those sections when you
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195 distribute them as separate works. But when you distribute the same sections
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196 as part of a whole which is a work based on the Library, the distribution of
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197 the whole must be on the terms of this License, whose permissions for other
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200
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201 Thus, it is not the intent of this section to claim rights or contest your
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203 the right to control the distribution of derivative or collective works
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204 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 with
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207 the Library (or with a work based on the Library) on a volume of a storage
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209 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 License
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217 wish.) Do not make any other change in these notices.
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218
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219 Once this change is made in a given copy, it is irreversible for that copy,
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220 so the ordinary GNU General Public License applies to all subsequent copies
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221 and derivative works made from that copy.
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222
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223 This option is useful when you wish to copy part of the code of the Library
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224 into a program that is not a library.
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225
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226 4. You may copy and distribute the Library (or a portion or derivative of
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228 Sections 1 and 2 above provided that you accompany it with the complete
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229 corresponding machine-readable source code, which must be distributed under
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231 software interchange.
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232
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233 If distribution of object code is made by offering access to copy from a
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234 designated place, then offering equivalent access to copy the source code
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235 from the same place satisfies the requirement to distribute the source code,
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236 even though third parties are not compelled to copy the source along with
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237 the object code.
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238
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239 5. A program that contains no derivative of any portion of the Library, but
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242 derivative work of the Library, and therefore falls outside the scope of
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243 this License.
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244
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245 However, linking a "work that uses the Library" with the Library creates an
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246 executable that is a derivative of the Library (because it contains portions
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248 is therefore covered by this License. Section 6 states terms for
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249 distribution of such executables.
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250
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251 When a "work that uses the Library" uses material from a header file that is
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256 precisely defined by law.
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257
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258 If such an object file uses only numerical parameters, data structure
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259 layouts and accessors, and small macros and small inline functions (ten
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260 lines or less in length), then the use of the object file is unrestricted,
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261 regardless of whether it is legally a derivative work. (Executables
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262 containing this object code plus portions of the Library will still fall
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263 under Section 6.)
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264
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265 Otherwise, if the work is a derivative of the Library, you may distribute
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266 the object code for the work under the terms of Section 6. Any executables
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268 linked directly with the Library itself.
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269
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270 6. As an exception to the Sections above, you may also compile or link a
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271 "work that uses the Library" with the Library to produce a work containing
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272 portions of the Library, and distribute that work under terms of your
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273 choice, provided that the terms permit modification of the work for the
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274 customer's own use and reverse engineering for debugging such modifications.
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275
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276 You must give prominent notice with each copy of the work that the Library
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278 You must supply a copy of this License. If the work during execution
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280 Library among them, as well as a reference directing the user to the copy of
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281 this License. Also, you must do one of these things:
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282
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283 o a) Accompany the work with the complete corresponding
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284 machine-readable source code for the Library including whatever
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285 changes were used in the work (which must be distributed under
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286 Sections 1 and 2 above); and, if the work is an executable linked
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287 with the Library, with the complete machine-readable "work that
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288 uses the Library", as object code and/or source code, so that the
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289 user can modify the Library and then relink to produce a modified
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290 executable containing the modified Library. (It is understood that
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291 the user who changes the contents of definitions files in the
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292 Library will not necessarily be able to recompile the application
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293 to use the modified definitions.)
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294
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295 o b) Accompany the work with a written offer, valid for at least
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296 three years, to give the same user the materials specified in
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297 Subsection 6a, above, for a charge no more than the cost of
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298 performing this distribution.
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299
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300 o c) If distribution of the work is made by offering access to copy
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302 specified materials from the same place.
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303
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304 o d) Verify that the user has already received a copy of these
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310 distributed need not include anything that is normally distributed (in
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313 component itself accompanies the executable.
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314
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315 It may happen that this requirement contradicts the license restrictions of
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316 other proprietary libraries that do not normally accompany the operating
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319
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320 7. You may place library facilities that are a work based on the Library
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326
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331
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336 8. You may not copy, modify, sublicense, link with, or distribute the
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430 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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439
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440 END OF TERMS AND CONDITIONS
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441
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442 This library is free software; you can redistribute it and/or
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450
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