1 | GNU LIBRARY GENERAL PUBLIC LICENSE
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2 | Version 2, June 1991
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3 |
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4 | Copyright (C) 1991 Free Software Foundation, Inc.
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5 | 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 library GPL. It is
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10 | numbered 2 because it goes with version 2 of the ordinary GPL.]
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11 |
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12 | Preamble
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13 |
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14 | The licenses for most software are designed to take away your
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15 | freedom to share and change it. By contrast, the GNU General Public
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16 | Licenses are intended to guarantee your freedom to share and change
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17 | free software--to make sure the software is free for all its users.
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18 |
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19 | This license, the Library General Public License, applies to some
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20 | specially designated Free Software Foundation software, and to any
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21 | other libraries whose authors decide to use it. You can use it for
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22 | your libraries, too.
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23 |
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24 | When we speak of free software, we are referring to freedom, not
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25 | price. Our General Public Licenses are designed to make sure that you
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26 | have the freedom to distribute copies of free software (and charge for
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27 | this service if you wish), that you receive source code or can get it
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28 | if you want it, that you can change the software or use pieces of it
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29 | in new free programs; and that you know you can do these things.
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30 |
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31 | To protect your rights, we need to make restrictions that forbid
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32 | anyone to deny you these rights or to ask you to surrender the rights.
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33 | These restrictions translate to certain responsibilities for you if
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34 | you distribute copies of the library, or if you modify it.
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35 |
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36 | For example, if you distribute copies of the library, whether gratis
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37 | or for a fee, you must give the recipients all the rights that we gave
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38 | you. You must make sure that they, too, receive or can get the source
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39 | code. If you link a program with the library, you must provide
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40 | complete object files to the recipients so that they can relink them
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41 | with the library, after making changes to the library and recompiling
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42 | it. And you must show them these terms so they know their rights.
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43 |
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44 | Our method of protecting your rights has two steps: (1) copyright
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45 | the library, and (2) offer you this license which gives you legal
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46 | permission to copy, distribute and/or modify the library.
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47 |
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48 | Also, for each distributor's protection, we want to make certain
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49 | that everyone understands that there is no warranty for this free
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50 | library. If the library is modified by someone else and passed on, we
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51 | want its recipients to know that what they have is not the original
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52 | version, so that any problems introduced by others will not reflect on
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53 | the original authors' reputations.
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54 |
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55 | Finally, any free program is threatened constantly by software
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56 | patents. We wish to avoid the danger that companies distributing free
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57 | software will individually obtain patent licenses, thus in effect
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58 | transforming the program into proprietary software. To prevent this,
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59 | we have made it clear that any patent must be licensed for everyone's
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60 | free use or not licensed at all.
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61 |
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62 | Most GNU software, including some libraries, is covered by the ordinary
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63 | GNU General Public License, which was designed for utility programs. This
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64 | license, the GNU Library General Public License, applies to certain
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65 | designated libraries. This license is quite different from the ordinary
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66 | one; be sure to read it in full, and don't assume that anything in it is
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67 | the same as in the ordinary license.
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68 |
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69 | The reason we have a separate public license for some libraries is that
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70 | they blur the distinction we usually make between modifying or adding to a
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71 | program and simply using it. Linking a program with a library, without
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72 | changing the library, is in some sense simply using the library, and is
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73 | analogous to running a utility program or application program. However, in
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74 | a textual and legal sense, the linked executable is a combined work, a
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75 | derivative of the original library, and the ordinary General Public License
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76 | treats it as such.
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77 |
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78 | Because of this blurred distinction, using the ordinary General
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79 | Public License for libraries did not effectively promote software
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80 | sharing, because most developers did not use the libraries. We
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81 | concluded that weaker conditions might promote sharing better.
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82 |
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83 | However, unrestricted linking of non-free programs would deprive the
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84 | users of those programs of all benefit from the free status of the
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85 | libraries themselves. This Library General Public License is intended to
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86 | permit developers of non-free programs to use free libraries, while
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87 | preserving your freedom as a user of such programs to change the free
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88 | libraries that are incorporated in them. (We have not seen how to achieve
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89 | this as regards changes in header files, but we have achieved it as regards
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90 | changes in the actual functions of the Library.) The hope is that this
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91 | will lead to faster development of free libraries.
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92 |
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93 | The precise terms and conditions for copying, distribution and
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94 | modification follow. Pay close attention to the difference between a
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95 | "work based on the library" and a "work that uses the library". The
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96 | former contains code derived from the library, while the latter only
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97 | works together with the library.
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98 |
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99 | Note that it is possible for a library to be covered by the ordinary
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100 | General Public License rather than by this special one.
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101 |
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102 | GNU LIBRARY GENERAL PUBLIC LICENSE
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103 | TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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104 |
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105 | 0. This License Agreement applies to any software library which
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106 | contains a notice placed by the copyright holder or other authorized
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107 | party saying it may be distributed under the terms of this Library
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108 | General Public License (also called "this License"). Each licensee is
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109 | addressed as "you".
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110 |
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111 | A "library" means a collection of software functions and/or data
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112 | prepared so as to be conveniently linked with application programs
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113 | (which use some of those functions and data) to form executables.
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114 |
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115 | The "Library", below, refers to any such software library or work
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121 | included without limitation in the term "modification".)
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122 |
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124 | making modifications to it. For a library, complete source code means
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127 | and installation of the library.
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128 |
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129 | Activities other than copying, distribution and modification are not
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130 | covered by this License; they are outside its scope. The act of
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131 | running a program using the Library is not restricted, and output from
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133 | on the Library (independent of the use of the Library in a tool for
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134 | writing it). Whether that is true depends on what the Library does
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135 | and what the program that uses the Library does.
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136 |
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137 | 1. You may copy and distribute verbatim copies of the Library's
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139 | you conspicuously and appropriately publish on each copy an
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140 | appropriate copyright notice and disclaimer of warranty; keep intact
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142 | warranty; and distribute a copy of this License along with the
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143 | Library.
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144 |
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145 | You may charge a fee for the physical act of transferring a copy,
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146 | and you may at your option offer warranty protection in exchange for a
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147 | fee.
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148 |
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149 | 2. You may modify your copy or copies of the Library or any portion
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150 | of it, thus forming a work based on the Library, and copy and
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151 | distribute such modifications or work under the terms of Section 1
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152 | above, provided that you also meet all of these conditions:
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153 |
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154 | a) The modified work must itself be a software library.
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155 |
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156 | b) You must cause the files modified to carry prominent notices
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157 | stating that you changed the files and the date of any change.
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158 |
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159 | c) You must cause the whole of the work to be licensed at no
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160 | charge to all third parties under the terms of this License.
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161 |
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162 | d) If a facility in the modified Library refers to a function or a
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163 | table of data to be supplied by an application program that uses
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164 | the facility, other than as an argument passed when the facility
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165 | is invoked, then you must make a good faith effort to ensure that,
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166 | in the event an application does not supply such function or
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167 | table, the facility still operates, and performs whatever part of
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168 | its purpose remains meaningful.
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169 |
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170 | (For example, a function in a library to compute square roots has
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171 | a purpose that is entirely well-defined independent of the
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172 | application. Therefore, Subsection 2d requires that any
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173 | application-supplied function or table used by this function must
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174 | be optional: if the application does not supply it, the square
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175 | root function must still compute square roots.)
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176 |
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177 | These requirements apply to the modified work as a whole. If
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178 | identifiable sections of that work are not derived from the Library,
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179 | and can be reasonably considered independent and separate works in
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180 | themselves, then this License, and its terms, do not apply to those
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181 | sections when you distribute them as separate works. But when you
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182 | distribute the same sections as part of a whole which is a work based
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183 | on the Library, the distribution of the whole must be on the terms of
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184 | this License, whose permissions for other licensees extend to the
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185 | entire whole, and thus to each and every part regardless of who wrote
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186 | it.
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187 |
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188 | Thus, it is not the intent of this section to claim rights or contest
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189 | your rights to work written entirely by you; rather, the intent is to
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190 | exercise the right to control the distribution of derivative or
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192 |
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193 | In addition, mere aggregation of another work not based on the Library
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194 | with the Library (or with a work based on the Library) on a volume of
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195 | a storage or distribution medium does not bring the other work under
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196 | the scope of this License.
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197 |
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198 | 3. You may opt to apply the terms of the ordinary GNU General Public
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199 | License instead of this License to a given copy of the Library. To do
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200 | this, you must alter all the notices that refer to this License, so
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201 | that they refer to the ordinary GNU General Public License, version 2,
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202 | instead of to this License. (If a newer version than version 2 of the
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203 | ordinary GNU General Public License has appeared, then you can specify
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204 | that version instead if you wish.) Do not make any other change in
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205 | these notices.
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206 |
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207 | Once this change is made in a given copy, it is irreversible for
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208 | that copy, so the ordinary GNU General Public License applies to all
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209 | subsequent copies and derivative works made from that copy.
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210 |
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211 | This option is useful when you wish to copy part of the code of
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212 | the Library into a program that is not a library.
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213 |
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214 | 4. You may copy and distribute the Library (or a portion or
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215 | derivative of it, under Section 2) in object code or executable form
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216 | under the terms of Sections 1 and 2 above provided that you accompany
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217 | it with the complete corresponding machine-readable source code, which
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218 | must be distributed under the terms of Sections 1 and 2 above on a
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220 |
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221 | If distribution of object code is made by offering access to copy
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222 | from a designated place, then offering equivalent access to copy the
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223 | source code from the same place satisfies the requirement to
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224 | distribute the source code, even though third parties are not
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225 | compelled to copy the source along with the object code.
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226 |
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227 | 5. A program that contains no derivative of any portion of the
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231 | therefore falls outside the scope of this License.
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232 |
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233 | However, linking a "work that uses the Library" with the Library
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235 | contains portions of the Library), rather than a "work that uses the
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236 | library". The executable is therefore covered by this License.
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237 | Section 6 states terms for distribution of such executables.
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238 |
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239 | When a "work that uses the Library" uses material from a header file
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240 | that is part of the Library, the object code for the work may be a
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241 | derivative work of the Library even though the source code is not.
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242 | Whether this is true is especially significant if the work can be
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243 | linked without the Library, or if the work is itself a library. The
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244 | threshold for this to be true is not precisely defined by law.
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245 |
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246 | If such an object file uses only numerical parameters, data
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247 | structure layouts and accessors, and small macros and small inline
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248 | functions (ten lines or less in length), then the use of the object
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250 | work. (Executables containing this object code plus portions of the
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251 | Library will still fall under Section 6.)
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252 |
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253 | Otherwise, if the work is a derivative of the Library, you may
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254 | distribute the object code for the work under the terms of Section 6.
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255 | Any executables containing that work also fall under Section 6,
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256 | whether or not they are linked directly with the Library itself.
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257 |
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258 | 6. As an exception to the Sections above, you may also compile or
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259 | link a "work that uses the Library" with the Library to produce a
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260 | work containing portions of the Library, and distribute that work
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261 | under terms of your choice, provided that the terms permit
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262 | modification of the work for the customer's own use and reverse
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263 | engineering for debugging such modifications.
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264 |
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265 | You must give prominent notice with each copy of the work that the
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266 | Library is used in it and that the Library and its use are covered by
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267 | this License. You must supply a copy of this License. If the work
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268 | during execution displays copyright notices, you must include the
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269 | copyright notice for the Library among them, as well as a reference
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270 | directing the user to the copy of this License. Also, you must do one
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271 | of these things:
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272 |
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273 | a) Accompany the work with the complete corresponding
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274 | machine-readable source code for the Library including whatever
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275 | changes were used in the work (which must be distributed under
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276 | Sections 1 and 2 above); and, if the work is an executable linked
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277 | with the Library, with the complete machine-readable "work that
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278 | uses the Library", as object code and/or source code, so that the
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279 | user can modify the Library and then relink to produce a modified
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280 | executable containing the modified Library. (It is understood
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281 | that the user who changes the contents of definitions files in the
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282 | Library will not necessarily be able to recompile the application
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283 | to use the modified definitions.)
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284 |
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285 | b) Accompany the work with a written offer, valid for at
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286 | least three years, to give the same user the materials
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287 | specified in Subsection 6a, above, for a charge no more
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288 | than the cost of performing this distribution.
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289 |
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290 | c) If distribution of the work is made by offering access to copy
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291 | from a designated place, offer equivalent access to copy the above
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292 | specified materials from the same place.
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293 |
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294 | d) Verify that the user has already received a copy of these
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295 | materials or that you have already sent this user a copy.
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296 |
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297 | For an executable, the required form of the "work that uses the
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298 | Library" must include any data and utility programs needed for
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299 | reproducing the executable from it. However, as a special exception,
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300 | the source code distributed need not include anything that is normally
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301 | distributed (in either source or binary form) with the major
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302 | components (compiler, kernel, and so on) of the operating system on
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303 | which the executable runs, unless that component itself accompanies
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304 | the executable.
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305 |
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306 | It may happen that this requirement contradicts the license
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307 | restrictions of other proprietary libraries that do not normally
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308 | accompany the operating system. Such a contradiction means you cannot
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309 | use both them and the Library together in an executable that you
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310 | distribute.
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311 |
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312 | 7. You may place library facilities that are a work based on the
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313 | Library side-by-side in a single library together with other library
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314 | facilities not covered by this License, and distribute such a combined
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315 | library, provided that the separate distribution of the work based on
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316 | the Library and of the other library facilities is otherwise
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317 | permitted, and provided that you do these two things:
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318 |
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319 | a) Accompany the combined library with a copy of the same work
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320 | based on the Library, uncombined with any other library
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321 | facilities. This must be distributed under the terms of the
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322 | Sections above.
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323 |
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324 | b) Give prominent notice with the combined library of the fact
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325 | that part of it is a work based on the Library, and explaining
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326 | where to find the accompanying uncombined form of the same work.
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327 |
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328 | 8. You may not copy, modify, sublicense, link with, or distribute
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329 | the Library except as expressly provided under this License. Any
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330 | attempt otherwise to copy, modify, sublicense, link with, or
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331 | distribute the Library is void, and will automatically terminate your
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332 | rights under this License. However, parties who have received copies,
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333 | or rights, from you under this License will not have their licenses
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334 | terminated so long as such parties remain in full compliance.
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335 |
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336 | 9. You are not required to accept this License, since you have not
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337 | signed it. However, nothing else grants you permission to modify or
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338 | distribute the Library or its derivative works. These actions are
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342 | all its terms and conditions for copying, distributing or modifying
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343 | the Library or works based on it.
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344 |
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345 | 10. Each time you redistribute the Library (or any work based on the
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346 | Library), the recipient automatically receives a license from the
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350 | You are not responsible for enforcing compliance by third parties to
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351 | this License.
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352 |
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353 | 11. If, as a consequence of a court judgment or allegation of patent
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354 | infringement or for any other reason (not limited to patent issues),
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355 | conditions are imposed on you (whether by court order, agreement or
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356 | otherwise) that contradict the conditions of this License, they do not
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357 | excuse you from the conditions of this License. If you cannot
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358 | distribute so as to satisfy simultaneously your obligations under this
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359 | License and any other pertinent obligations, then as a consequence you
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360 | may not distribute the Library at all. For example, if a patent
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361 | license would not permit royalty-free redistribution of the Library by
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362 | all those who receive copies directly or indirectly through you, then
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363 | the only way you could satisfy both it and this License would be to
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364 | refrain entirely from distribution of the Library.
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365 |
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366 | If any portion of this section is held invalid or unenforceable under any
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367 | particular circumstance, the balance of the section is intended to apply,
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368 | and the section as a whole is intended to apply in other circumstances.
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369 |
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370 | It is not the purpose of this section to induce you to infringe any
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371 | patents or other property right claims or to contest validity of any
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372 | such claims; this section has the sole purpose of protecting the
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373 | integrity of the free software distribution system which is
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374 | implemented by public license practices. Many people have made
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375 | generous contributions to the wide range of software distributed
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376 | through that system in reliance on consistent application of that
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378 | to distribute software through any other system and a licensee cannot
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379 | impose that choice.
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380 |
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381 | This section is intended to make thoroughly clear what is believed to
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382 | be a consequence of the rest of this License.
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383 |
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384 | 12. If the distribution and/or use of the Library is restricted in
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385 | certain countries either by patents or by copyrighted interfaces, the
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386 | original copyright holder who places the Library under this License may add
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387 | an explicit geographical distribution limitation excluding those countries,
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388 | so that distribution is permitted only in or among countries not thus
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389 | excluded. In such case, this License incorporates the limitation as if
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390 | written in the body of this License.
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391 |
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392 | 13. The Free Software Foundation may publish revised and/or new
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393 | versions of the Library General Public License from time to time.
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394 | Such new versions will be similar in spirit to the present version,
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395 | but may differ in detail to address new problems or concerns.
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396 |
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397 | Each version is given a distinguishing version number. If the Library
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398 | specifies a version number of this License which applies to it and
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399 | "any later version", you have the option of following the terms and
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400 | conditions either of that version or of any later version published by
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401 | the Free Software Foundation. If the Library does not specify a
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402 | license version number, you may choose any version ever published by
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404 |
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405 | 14. If you wish to incorporate parts of the Library into other free
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406 | programs whose distribution conditions are incompatible with these,
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407 | write to the author to ask for permission. For software which is
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408 | copyrighted by the Free Software Foundation, write to the Free
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409 | Software Foundation; we sometimes make exceptions for this. Our
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410 | decision will be guided by the two goals of preserving the free status
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411 | of all derivatives of our free software and of promoting the sharing
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412 | and reuse of software generally.
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413 |
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414 | NO WARRANTY
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415 |
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416 | 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
|
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417 | WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
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418 | EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
|
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419 | OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
|
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420 | KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
|
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421 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
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422 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
|
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423 | LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
|
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424 | THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
|
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425 |
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426 | 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
|
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427 | WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
|
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428 | AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
|
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429 | FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
|
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430 | CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
|
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431 | LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
|
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432 | RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
|
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433 | FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
|
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434 | SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
|
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435 | DAMAGES.
|
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436 |
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437 | END OF TERMS AND CONDITIONS
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438 |
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439 | How to Apply These Terms to Your New Libraries
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440 |
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441 | If you develop a new library, and you want it to be of the greatest
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442 | possible use to the public, we recommend making it free software that
|
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443 | everyone can redistribute and change. You can do so by permitting
|
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444 | redistribution under these terms (or, alternatively, under the terms of the
|
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445 | ordinary General Public License).
|
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446 |
|
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447 | To apply these terms, attach the following notices to the library. It is
|
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448 | safest to attach them to the start of each source file to most effectively
|
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449 | convey the exclusion of warranty; and each file should have at least the
|
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450 | "copyright" line and a pointer to where the full notice is found.
|
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451 |
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452 | <one line to give the library's name and a brief idea of what it does.>
|
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453 | Copyright (C) <year> <name of author>
|
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454 |
|
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455 | This library is free software; you can redistribute it and/or
|
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456 | modify it under the terms of the GNU Library General Public
|
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457 | License as published by the Free Software Foundation; either
|
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458 | version 2 of the License, or (at your option) any later version.
|
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459 |
|
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460 | This library is distributed in the hope that it will be useful,
|
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461 | but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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462 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
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463 | Library General Public License for more details.
|
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464 |
|
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465 | You should have received a copy of the GNU Library General Public
|
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466 | License along with this library; if not, write to the Free
|
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467 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
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468 |
|
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469 | Also add information on how to contact you by electronic and paper mail.
|
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470 |
|
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471 | You should also get your employer (if you work as a programmer) or your
|
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472 | school, if any, to sign a "copyright disclaimer" for the library, if
|
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473 | necessary. Here is a sample; alter the names:
|
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474 |
|
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475 | Yoyodyne, Inc., hereby disclaims all copyright interest in the
|
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476 | library `Frob' (a library for tweaking knobs) written by James Random Hacker.
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477 |
|
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478 | <signature of Ty Coon>, 1 April 1990
|
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479 | Ty Coon, President of Vice
|
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480 |
|
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481 | That's all there is to it!
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