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1
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2 GNU LIBRARY GENERAL PUBLIC LICENSE
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3 Version 2, June 1991
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4
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5
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6 Copyright (C) 1991 Free Software Foundation, Inc.
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7 675 Mass Ave, Cambridge, MA 02139, USA
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8 Everyone is permitted to copy and distribute verbatim copies
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9 of this license document, but changing it is not allowed.
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10
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11 [This is the first released version of the library GPL. It is
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12 numbered 2 because it goes with version 2 of the ordinary GPL.]
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13
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14 Preamble
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15
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16 The licenses for most software are designed to take away your
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17 freedom to share and change it. By contrast, the GNU General Public
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18 Licenses are intended to guarantee your freedom to share and change
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19 free software--to make sure the software is free for all its users.
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20
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21 This license, the Library General Public License, applies to some
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22 specially designated Free Software Foundation software, and to any
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23 other libraries whose authors decide to use it. You can use it for
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24 your libraries, too.
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25
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26 When we speak of free software, we are referring to freedom, not
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27 price. Our General Public Licenses are designed to make sure that you
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28 have the freedom to distribute copies of free software (and charge for
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29 this service if you wish), that you receive source code or can get it
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30 if you want it, that you can change the software or use pieces of it
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31 in new free programs; and that you know you can do these things.
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32
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33 To protect your rights, we need to make restrictions that forbid
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34 anyone to deny you these rights or to ask you to surrender the rights.
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35 These restrictions translate to certain responsibilities for you if
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36 you distribute copies of the library, or if you modify it.
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37
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38 For example, if you distribute copies of the library, whether gratis
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39 or for a fee, you must give the recipients all the rights that we gave
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40 you. You must make sure that they, too, receive or can get the source
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41 code. If you link a program with the library, you must provide
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42 complete object files to the recipients so that they can relink them
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43 with the library, after making changes to the library and recompiling
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44 it. And you must show them these terms so they know their rights.
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45
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46 Our method of protecting your rights has two steps: (1) copyright
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47 the library, and (2) offer you this license which gives you legal
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48 permission to copy, distribute and/or modify the library.
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49
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50 Also, for each distributor's protection, we want to make certain
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51 that everyone understands that there is no warranty for this free
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52 library. If the library is modified by someone else and passed on, we
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53 want its recipients to know that what they have is not the original
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54 version, so that any problems introduced by others will not reflect on
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55 the original authors' reputations.
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56
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57 Finally, any free program is threatened constantly by software
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58 patents. We wish to avoid the danger that companies distributing free
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59 software will individually obtain patent licenses, thus in effect
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60 transforming the program into proprietary software. To prevent this,
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61 we have made it clear that any patent must be licensed for everyone's
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62 free use or not licensed at all.
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63
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64 Most GNU software, including some libraries, is covered by the ordinary
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65 GNU General Public License, which was designed for utility programs. This
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66 license, the GNU Library General Public License, applies to certain
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67 designated libraries. This license is quite different from the ordinary
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68 one; be sure to read it in full, and don't assume that anything in it is
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69 the same as in the ordinary license.
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70
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71 The reason we have a separate public license for some libraries is that
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72 they blur the distinction we usually make between modifying or adding to a
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73 program and simply using it. Linking a program with a library, without
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74 changing the library, is in some sense simply using the library, and is
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75 analogous to running a utility program or application program. However, in
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76 a textual and legal sense, the linked executable is a combined work, a
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77 derivative of the original library, and the ordinary General Public License
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78 treats it as such.
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79
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80 Because of this blurred distinction, using the ordinary General
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81 Public License for libraries did not effectively promote software
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82 sharing, because most developers did not use the libraries. We
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83 concluded that weaker conditions might promote sharing better.
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84
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85 However, unrestricted linking of non-free programs would deprive the
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86 users of those programs of all benefit from the free status of the
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87 libraries themselves. This Library General Public License is intended to
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88 permit developers of non-free programs to use free libraries, while
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89 preserving your freedom as a user of such programs to change the free
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90 libraries that are incorporated in them. (We have not seen how to achieve
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91 this as regards changes in header files, but we have achieved it as regards
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92 changes in the actual functions of the Library.) The hope is that this
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93 will lead to faster development of free libraries.
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94
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95 The precise terms and conditions for copying, distribution and
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96 modification follow. Pay close attention to the difference between a
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97 "work based on the library" and a "work that uses the library". The
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98 former contains code derived from the library, while the latter only
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99 works together with the library.
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100
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101 Note that it is possible for a library to be covered by the ordinary
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102 General Public License rather than by this special one.
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103
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104 GNU LIBRARY GENERAL PUBLIC LICENSE
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105 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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106
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107 0. This License Agreement applies to any software library which
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108 contains a notice placed by the copyright holder or other authorized
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112
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113 A "library" means a collection of software functions and/or data
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114 prepared so as to be conveniently linked with application programs
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130
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131 Activities other than copying, distribution and modification are not
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138
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139 1. You may copy and distribute verbatim copies of the Library's
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142 appropriate copyright notice and disclaimer of warranty; keep intact
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145 Library.
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149 fee.
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150
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155
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156 a) The modified work must itself be a software library.
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157
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158 b) You must cause the files modified to carry prominent notices
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160
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161 c) You must cause the whole of the work to be licensed at no
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163
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164 d) If a facility in the modified Library refers to a function or a
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165 table of data to be supplied by an application program that uses
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166 the facility, other than as an argument passed when the facility
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167 is invoked, then you must make a good faith effort to ensure that,
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168 in the event an application does not supply such function or
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169 table, the facility still operates, and performs whatever part of
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170 its purpose remains meaningful.
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171
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172 (For example, a function in a library to compute square roots has
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173 a purpose that is entirely well-defined independent of the
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174 application. Therefore, Subsection 2d requires that any
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175 application-supplied function or table used by this function must
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176 be optional: if the application does not supply it, the square
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177 root function must still compute square roots.)
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178
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179 These requirements apply to the modified work as a whole. If
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180 identifiable sections of that work are not derived from the Library,
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183 sections when you distribute them as separate works. But when you
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188 it.
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189
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190 Thus, it is not the intent of this section to claim rights or contest
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198 the scope of this License.
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199
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200 3. You may opt to apply the terms of the ordinary GNU General Public
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207 these notices.
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208
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209 Once this change is made in a given copy, it is irreversible for
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211 subsequent copies and derivative works made from that copy.
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212
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213 This option is useful when you wish to copy part of the code of
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214 the Library into a program that is not a library.
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215
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216 4. You may copy and distribute the Library (or a portion or
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217 derivative of it, under Section 2) in object code or executable form
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219 it with the complete corresponding machine-readable source code, which
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220 must be distributed under the terms of Sections 1 and 2 above on a
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221 medium customarily used for software interchange.
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222
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223 If distribution of object code is made by offering access to copy
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224 from a designated place, then offering equivalent access to copy the
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225 source code from the same place satisfies the requirement to
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226 distribute the source code, even though third parties are not
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227 compelled to copy the source along with the object code.
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228
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229 5. A program that contains no derivative of any portion of the
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230 Library, but is designed to work with the Library by being compiled or
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233 therefore falls outside the scope of this License.
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234
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235 However, linking a "work that uses the Library" with the Library
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236 creates an executable that is a derivative of the Library (because it
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237 contains portions of the Library), rather than a "work that uses the
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238 library". The executable is therefore covered by this License.
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239 Section 6 states terms for distribution of such executables.
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240
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241 When a "work that uses the Library" uses material from a header file
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242 that is part of the Library, the object code for the work may be a
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244 Whether this is true is especially significant if the work can be
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246 threshold for this to be true is not precisely defined by law.
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247
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248 If such an object file uses only numerical parameters, data
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249 structure layouts and accessors, and small macros and small inline
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250 functions (ten lines or less in length), then the use of the object
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251 file is unrestricted, regardless of whether it is legally a derivative
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252 work. (Executables containing this object code plus portions of the
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253 Library will still fall under Section 6.)
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254
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255 Otherwise, if the work is a derivative of the Library, you may
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256 distribute the object code for the work under the terms of Section 6.
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257 Any executables containing that work also fall under Section 6,
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258 whether or not they are linked directly with the Library itself.
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259
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260 6. As an exception to the Sections above, you may also compile or
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261 link a "work that uses the Library" with the Library to produce a
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262 work containing portions of the Library, and distribute that work
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264 modification of the work for the customer's own use and reverse
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265 engineering for debugging such modifications.
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266
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267 You must give prominent notice with each copy of the work that the
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268 Library is used in it and that the Library and its use are covered by
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269 this License. You must supply a copy of this License. If the work
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270 during execution displays copyright notices, you must include the
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271 copyright notice for the Library among them, as well as a reference
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272 directing the user to the copy of this License. Also, you must do one
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273 of these things:
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274
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275 a) Accompany the work with the complete corresponding
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276 machine-readable source code for the Library including whatever
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277 changes were used in the work (which must be distributed under
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278 Sections 1 and 2 above); and, if the work is an executable linked
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279 with the Library, with the complete machine-readable "work that
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280 uses the Library", as object code and/or source code, so that the
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281 user can modify the Library and then relink to produce a modified
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282 executable containing the modified Library. (It is understood
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283 that the user who changes the contents of definitions files in the
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284 Library will not necessarily be able to recompile the application
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285 to use the modified definitions.)
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286
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287 b) Accompany the work with a written offer, valid for at
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288 least three years, to give the same user the materials
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289 specified in Subsection 6a, above, for a charge no more
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290 than the cost of performing this distribution.
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291
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292 c) If distribution of the work is made by offering access to copy
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293 from a designated place, offer equivalent access to copy the above
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294 specified materials from the same place.
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295
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296 d) Verify that the user has already received a copy of these
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297 materials or that you have already sent this user a copy.
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298
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299 For an executable, the required form of the "work that uses the
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300 Library" must include any data and utility programs needed for
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301 reproducing the executable from it. However, as a special exception,
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302 the source code distributed need not include anything that is normally
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303 distributed (in either source or binary form) with the major
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304 components (compiler, kernel, and so on) of the operating system on
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305 which the executable runs, unless that component itself accompanies
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306 the executable.
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307
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308 It may happen that this requirement contradicts the license
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309 restrictions of other proprietary libraries that do not normally
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310 accompany the operating system. Such a contradiction means you cannot
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311 use both them and the Library together in an executable that you
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312 distribute.
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313
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314 7. You may place library facilities that are a work based on the
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315 Library side-by-side in a single library together with other library
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316 facilities not covered by this License, and distribute such a combined
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317 library, provided that the separate distribution of the work based on
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318 the Library and of the other library facilities is otherwise
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319 permitted, and provided that you do these two things:
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320
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321 a) Accompany the combined library with a copy of the same work
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322 based on the Library, uncombined with any other library
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323 facilities. This must be distributed under the terms of the
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324 Sections above.
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325
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326 b) Give prominent notice with the combined library of the fact
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327 that part of it is a work based on the Library, and explaining
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328 where to find the accompanying uncombined form of the same work.
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329
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330 8. You may not copy, modify, sublicense, link with, or distribute
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331 the Library except as expressly provided under this License. Any
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332 attempt otherwise to copy, modify, sublicense, link with, or
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333 distribute the Library is void, and will automatically terminate your
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334 rights under this License. However, parties who have received copies,
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335 or rights, from you under this License will not have their licenses
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336 terminated so long as such parties remain in full compliance.
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337
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338 9. You are not required to accept this License, since you have not
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339 signed it. However, nothing else grants you permission to modify or
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340 distribute the Library or its derivative works. These actions are
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341 prohibited by law if you do not accept this License. Therefore, by
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342 modifying or distributing the Library (or any work based on the
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343 Library), you indicate your acceptance of this License to do so, and
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344 all its terms and conditions for copying, distributing or modifying
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345 the Library or works based on it.
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346
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347 10. Each time you redistribute the Library (or any work based on the
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348 Library), the recipient automatically receives a license from the
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349 original licensor to copy, distribute, link with or modify the Library
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350 subject to these terms and conditions. You may not impose any further
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351 restrictions on the recipients' exercise of the rights granted herein.
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352 You are not responsible for enforcing compliance by third parties to
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353 this License.
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354
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355 11. If, as a consequence of a court judgment or allegation of patent
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356 infringement or for any other reason (not limited to patent issues),
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357 conditions are imposed on you (whether by court order, agreement or
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358 otherwise) that contradict the conditions of this License, they do not
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359 excuse you from the conditions of this License. If you cannot
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360 distribute so as to satisfy simultaneously your obligations under this
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361 License and any other pertinent obligations, then as a consequence you
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362 may not distribute the Library at all. For example, if a patent
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363 license would not permit royalty-free redistribution of the Library by
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364 all those who receive copies directly or indirectly through you, then
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365 the only way you could satisfy both it and this License would be to
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366 refrain entirely from distribution of the Library.
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367
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368 If any portion of this section is held invalid or unenforceable under any
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369 particular circumstance, the balance of the section is intended to apply,
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370 and the section as a whole is intended to apply in other circumstances.
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371
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372 It is not the purpose of this section to induce you to infringe any
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373 patents or other property right claims or to contest validity of any
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374 such claims; this section has the sole purpose of protecting the
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375 integrity of the free software distribution system which is
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376 implemented by public license practices. Many people have made
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377 generous contributions to the wide range of software distributed
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378 through that system in reliance on consistent application of that
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379 system; it is up to the author/donor to decide if he or she is willing
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380 to distribute software through any other system and a licensee cannot
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381 impose that choice.
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382
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383 This section is intended to make thoroughly clear what is believed to
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384 be a consequence of the rest of this License.
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385
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386 12. If the distribution and/or use of the Library is restricted in
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387 certain countries either by patents or by copyrighted interfaces, the
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388 original copyright holder who places the Library under this License may add
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389 an explicit geographical distribution limitation excluding those countries,
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390 so that distribution is permitted only in or among countries not thus
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391 excluded. In such case, this License incorporates the limitation as if
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392 written in the body of this License.
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393
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394 13. The Free Software Foundation may publish revised and/or new
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395 versions of the Library General Public License from time to time.
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396 Such new versions will be similar in spirit to the present version,
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397 but may differ in detail to address new problems or concerns.
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398
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399 Each version is given a distinguishing version number. If the Library
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400 specifies a version number of this License which applies to it and
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401 "any later version", you have the option of following the terms and
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402 conditions either of that version or of any later version published by
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403 the Free Software Foundation. If the Library does not specify a
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404 license version number, you may choose any version ever published by
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405 the Free Software Foundation.
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406
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407 14. If you wish to incorporate parts of the Library into other free
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408 programs whose distribution conditions are incompatible with these,
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409 write to the author to ask for permission. For software which is
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410 copyrighted by the Free Software Foundation, write to the Free
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411 Software Foundation; we sometimes make exceptions for this. Our
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412 decision will be guided by the two goals of preserving the free status
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413 of all derivatives of our free software and of promoting the sharing
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414 and reuse of software generally.
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415
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416 NO WARRANTY
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417
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418 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
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419 WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
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420 EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
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421 OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
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422 KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
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423 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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424 PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
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425 LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
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426 THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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427
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428 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
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429 WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
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430 AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
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431 FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
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432 CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
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433 LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
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434 RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
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435 FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
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436 SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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437 DAMAGES.
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438
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439 END OF TERMS AND CONDITIONS
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440
|
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441 Appendix: How to Apply These Terms to Your New Libraries
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442
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443 If you develop a new library, and you want it to be of the greatest
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444 possible use to the public, we recommend making it free software that
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445 everyone can redistribute and change. You can do so by permitting
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446 redistribution under these terms (or, alternatively, under the terms of the
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447 ordinary General Public License).
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448
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449 To apply these terms, attach the following notices to the library. It is
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450 safest to attach them to the start of each source file to most effectively
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451 convey the exclusion of warranty; and each file should have at least the
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452 "copyright" line and a pointer to where the full notice is found.
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453
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454 <one line to give the library's name and a brief idea of what it does.>
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455 Copyright (C) <year> <name of author>
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456
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457 This library is free software; you can redistribute it and/or
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458 modify it under the terms of the GNU Library General Public
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459 License as published by the Free Software Foundation; either
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460 version 2 of the License, or (at your option) any later version.
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|
461
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462 This library is distributed in the hope that it will be useful,
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463 but WITHOUT ANY WARRANTY; without even the implied warranty of
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464 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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465 Library General Public License for more details.
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466
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467 You should have received a copy of the GNU Library General Public
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468 License along with this library; if not, write to the Free
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469 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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470
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471 Also add information on how to contact you by electronic and paper mail.
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472
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473 You should also get your employer (if you work as a programmer) or your
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474 school, if any, to sign a "copyright disclaimer" for the library, if
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475 necessary. Here is a sample; alter the names:
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476
|
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477 Yoyodyne, Inc., hereby disclaims all copyright interest in the
|
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478 library `Frob' (a library for tweaking knobs) written by James Random Hacker.
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479
|
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480 <signature of Ty Coon>, 1 April 1990
|
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481 Ty Coon, President of Vice
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482
|
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483 That's all there is to it!
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484
|
