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1
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2 GNU LESSER GENERAL PUBLIC LICENSE
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3 Version 2.1, February 1999
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4
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5 Copyright (C) 1991, 1999 Free Software Foundation, Inc.
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6 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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7 Everyone is permitted to copy and distribute verbatim copies
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8 of this license document, but changing it is not allowed.
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9
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10 [This is the first released version of the Lesser GPL. It also counts
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11 as the successor of the GNU Library Public License, version 2, hence
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12 the version number 2.1.]
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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 Lesser General Public License, applies to some
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22 specially designated software packages--typically libraries--of the
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23 Free Software Foundation and other authors who decide to use it. You
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24 can use it too, but we suggest you first think carefully about whether
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25 this license or the ordinary General Public License is the better
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26 strategy to use in any particular case, based on the explanations
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27 below.
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28
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29 When we speak of free software, we are referring to freedom of use,
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30 not price. Our General Public Licenses are designed to make sure that
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31 you have the freedom to distribute copies of free software (and charge
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32 for this service if you wish); that you receive source code or can get
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33 it if you want it; that you can change the software and use pieces of
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34 it in new free programs; and that you are informed that you can do
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35 these things.
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36
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37 To protect your rights, we need to make restrictions that forbid
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38 distributors to deny you these rights or to ask you to surrender these
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39 rights. These restrictions translate to certain responsibilities for
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40 you if you distribute copies of the library or if you modify it.
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41
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42 For example, if you distribute copies of the library, whether gratis
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43 or for a fee, you must give the recipients all the rights that we gave
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44 you. You must make sure that they, too, receive or can get the source
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45 code. If you link other code with the library, you must provide
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46 complete object files to the recipients, so that they can relink them
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47 with the library after making changes to the library and recompiling
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48 it. And you must show them these terms so they know their rights.
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49
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50 We protect your rights with a two-step method: (1) we copyright the
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51 library, and (2) we offer you this license, which gives you legal
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52 permission to copy, distribute and/or modify the library.
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53
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54 To protect each distributor, we want to make it very clear that
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55 there is no warranty for the free library. Also, if the library is
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56 modified by someone else and passed on, the recipients should know
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57 that what they have is not the original version, so that the original
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58 author's reputation will not be affected by problems that might be
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59 introduced by others.
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60 ^L
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61 Finally, software patents pose a constant threat to the existence of
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62 any free program. We wish to make sure that a company cannot
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63 effectively restrict the users of a free program by obtaining a
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64 restrictive license from a patent holder. Therefore, we insist that
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65 any patent license obtained for a version of the library must be
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66 consistent with the full freedom of use specified in this license.
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67
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68 Most GNU software, including some libraries, is covered by the
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69 ordinary GNU General Public License. This license, the GNU Lesser
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70 General Public License, applies to certain designated libraries, and
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71 is quite different from the ordinary General Public License. We use
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72 this license for certain libraries in order to permit linking those
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73 libraries into non-free programs.
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74
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75 When a program is linked with a library, whether statically or using
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76 a shared library, the combination of the two is legally speaking a
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77 combined work, a derivative of the original library. The ordinary
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78 General Public License therefore permits such linking only if the
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79 entire combination fits its criteria of freedom. The Lesser General
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80 Public License permits more lax criteria for linking other code with
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81 the library.
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82
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83 We call this license the "Lesser" General Public License because it
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84 does Less to protect the user's freedom than the ordinary General
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85 Public License. It also provides other free software developers Less
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86 of an advantage over competing non-free programs. These disadvantages
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87 are the reason we use the ordinary General Public License for many
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88 libraries. However, the Lesser license provides advantages in certain
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89 special circumstances.
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90
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91 For example, on rare occasions, there may be a special need to
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92 encourage the widest possible use of a certain library, so that it
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93 becomes a de-facto standard. To achieve this, non-free programs must
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94 be allowed to use the library. A more frequent case is that a free
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95 library does the same job as widely used non-free libraries. In this
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96 case, there is little to gain by limiting the free library to free
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97 software only, so we use the Lesser General Public License.
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98
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99 In other cases, permission to use a particular library in non-free
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100 programs enables a greater number of people to use a large body of
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101 free software. For example, permission to use the GNU C Library in
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102 non-free programs enables many more people to use the whole GNU
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103 operating system, as well as its variant, the GNU/Linux operating
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104 system.
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105
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106 Although the Lesser General Public License is Less protective of the
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107 users' freedom, it does ensure that the user of a program that is
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108 linked with the Library has the freedom and the wherewithal to run
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109 that program using a modified version of the Library.
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110
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111 The precise terms and conditions for copying, distribution and
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112 modification follow. Pay close attention to the difference between a
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113 "work based on the library" and a "work that uses the library". The
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114 former contains code derived from the library, whereas the latter must
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115 be combined with the library in order to run.
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116 ^L
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117 GNU LESSER GENERAL PUBLIC LICENSE
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118 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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119
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120 0. This License Agreement applies to any software library or other
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121 program which contains a notice placed by the copyright holder or
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122 other authorized party saying it may be distributed under the terms of
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123 this Lesser General Public License (also called "this License").
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124 Each licensee is addressed as "you".
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125
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126 A "library" means a collection of software functions and/or data
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132 Library" means either the Library or any derivative work under
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135 straightforwardly into another language. (Hereinafter, translation is
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143
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144 Activities other than copying, distribution and modification are not
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177 d) If a facility in the modified Library refers to a function or a
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178 table of data to be supplied by an application program that uses
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181 in the event an application does not supply such function or
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185 (For example, a function in a library to compute square roots has
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186 a purpose that is entirely well-defined independent of the
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187 application. Therefore, Subsection 2d requires that any
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189 be optional: if the application does not supply it, the square
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190 root function must still compute square roots.)
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203 Thus, it is not the intent of this section to claim rights or contest
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212
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213 3. You may opt to apply the terms of the ordinary GNU General Public
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228
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236 If distribution of object code is made by offering access to copy
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238 source code from the same place satisfies the requirement to
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239 distribute the source code, even though third parties are not
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240 compelled to copy the source along with the object code.
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241
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250 contains portions of the Library), rather than a "work that uses the
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251 library". The executable is therefore covered by this License.
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252 Section 6 states terms for distribution of such executables.
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254 When a "work that uses the Library" uses material from a header file
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260
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261 If such an object file uses only numerical parameters, data
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262 structure layouts and accessors, and small macros and small inline
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263 functions (ten lines or less in length), then the use of the object
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264 file is unrestricted, regardless of whether it is legally a derivative
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265 work. (Executables containing this object code plus portions of the
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266 Library will still fall under Section 6.)
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267
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268 Otherwise, if the work is a derivative of the Library, you may
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269 distribute the object code for the work under the terms of Section 6.
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270 Any executables containing that work also fall under Section 6,
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271 whether or not they are linked directly with the Library itself.
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272 ^L
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273 6. As an exception to the Sections above, you may also combine or
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274 link a "work that uses the Library" with the Library to produce a
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275 work containing portions of the Library, and distribute that work
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277 modification of the work for the customer's own use and reverse
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278 engineering for debugging such modifications.
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279
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280 You must give prominent notice with each copy of the work that the
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281 Library is used in it and that the Library and its use are covered by
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282 this License. You must supply a copy of this License. If the work
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283 during execution displays copyright notices, you must include the
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284 copyright notice for the Library among them, as well as a reference
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285 directing the user to the copy of this License. Also, you must do one
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286 of these things:
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287
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288 a) Accompany the work with the complete corresponding
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289 machine-readable source code for the Library including whatever
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290 changes were used in the work (which must be distributed under
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291 Sections 1 and 2 above); and, if the work is an executable linked
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292 with the Library, with the complete machine-readable "work that
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297 Library will not necessarily be able to recompile the application
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298 to use the modified definitions.)
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299
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300 b) Use a suitable shared library mechanism for linking with the
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301 Library. A suitable mechanism is one that (1) uses at run time a
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303 rather than copying library functions into the executable, and (2)
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305 the user installs one, as long as the modified version is
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306 interface-compatible with the version that the work was made with.
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307
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308 c) Accompany the work with a written offer, valid for at least
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309 three years, to give the same user the materials specified in
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310 Subsection 6a, above, for a charge no more than the cost of
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311 performing this distribution.
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312
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313 d) If distribution of the work is made by offering access to copy
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314 from a designated place, offer equivalent access to copy the above
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315 specified materials from the same place.
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316
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317 e) Verify that the user has already received a copy of these
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318 materials or that you have already sent this user a copy.
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319
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320 For an executable, the required form of the "work that uses the
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321 Library" must include any data and utility programs needed for
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322 reproducing the executable from it. However, as a special exception,
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323 the materials to be distributed need not include anything that is
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324 normally distributed (in either source or binary form) with the major
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326 which the executable runs, unless that component itself accompanies
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327 the executable.
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328
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329 It may happen that this requirement contradicts the license
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330 restrictions of other proprietary libraries that do not normally
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331 accompany the operating system. Such a contradiction means you cannot
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332 use both them and the Library together in an executable that you
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333 distribute.
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334 ^L
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335 7. You may place library facilities that are a work based on the
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336 Library side-by-side in a single library together with other library
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337 facilities not covered by this License, and distribute such a combined
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338 library, provided that the separate distribution of the work based on
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341
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342 a) Accompany the combined library with a copy of the same work
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344 facilities. This must be distributed under the terms of the
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345 Sections above.
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346
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347 b) Give prominent notice with the combined library of the fact
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348 that part of it is a work based on the Library, and explaining
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350
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351 8. You may not copy, modify, sublicense, link with, or distribute
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352 the Library except as expressly provided under this License. Any
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354 distribute the Library is void, and will automatically terminate your
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356 or rights, from you under this License will not have their licenses
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357 terminated so long as such parties remain in full compliance.
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358
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359 9. You are not required to accept this License, since you have not
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360 signed it. However, nothing else grants you permission to modify or
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361 distribute the Library or its derivative works. These actions are
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362 prohibited by law if you do not accept this License. Therefore, by
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366 the Library or works based on it.
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367
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368 10. Each time you redistribute the Library (or any work based on the
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369 Library), the recipient automatically receives a license from the
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370 original licensor to copy, distribute, link with or modify the Library
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371 subject to these terms and conditions. You may not impose any further
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372 restrictions on the recipients' exercise of the rights granted herein.
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373 You are not responsible for enforcing compliance by third parties with
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374 this License.
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375 ^L
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376 11. If, as a consequence of a court judgment or allegation of patent
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377 infringement or for any other reason (not limited to patent issues),
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378 conditions are imposed on you (whether by court order, agreement or
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379 otherwise) that contradict the conditions of this License, they do not
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380 excuse you from the conditions of this License. If you cannot
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381 distribute so as to satisfy simultaneously your obligations under this
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382 License and any other pertinent obligations, then as a consequence you
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383 may not distribute the Library at all. For example, if a patent
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384 license would not permit royalty-free redistribution of the Library by
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385 all those who receive copies directly or indirectly through you, then
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386 the only way you could satisfy both it and this License would be to
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387 refrain entirely from distribution of the Library.
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388
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389 If any portion of this section is held invalid or unenforceable under
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390 any particular circumstance, the balance of the section is intended to
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391 apply, and the section as a whole is intended to apply in other
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392 circumstances.
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393
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394 It is not the purpose of this section to induce you to infringe any
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395 patents or other property right claims or to contest validity of any
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396 such claims; this section has the sole purpose of protecting the
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397 integrity of the free software distribution system which is
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398 implemented by public license practices. Many people have made
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399 generous contributions to the wide range of software distributed
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400 through that system in reliance on consistent application of that
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401 system; it is up to the author/donor to decide if he or she is willing
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402 to distribute software through any other system and a licensee cannot
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403 impose that choice.
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404
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405 This section is intended to make thoroughly clear what is believed to
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406 be a consequence of the rest of this License.
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407
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408 12. If the distribution and/or use of the Library is restricted in
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409 certain countries either by patents or by copyrighted interfaces, the
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410 original copyright holder who places the Library under this License
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411 may add an explicit geographical distribution limitation excluding those
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412 countries, so that distribution is permitted only in or among
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413 countries not thus excluded. In such case, this License incorporates
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414 the limitation as if written in the body of this License.
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415
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416 13. The Free Software Foundation may publish revised and/or new
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417 versions of the Lesser General Public License from time to time.
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418 Such new versions will be similar in spirit to the present version,
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419 but may differ in detail to address new problems or concerns.
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420
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421 Each version is given a distinguishing version number. If the Library
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422 specifies a version number of this License which applies to it and
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423 "any later version", you have the option of following the terms and
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424 conditions either of that version or of any later version published by
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425 the Free Software Foundation. If the Library does not specify a
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426 license version number, you may choose any version ever published by
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427 the Free Software Foundation.
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428 ^L
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429 14. If you wish to incorporate parts of the Library into other free
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430 programs whose distribution conditions are incompatible with these,
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431 write to the author to ask for permission. For software which is
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432 copyrighted by the Free Software Foundation, write to the Free
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433 Software Foundation; we sometimes make exceptions for this. Our
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434 decision will be guided by the two goals of preserving the free status
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435 of all derivatives of our free software and of promoting the sharing
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436 and reuse of software generally.
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437
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438 NO WARRANTY
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439
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440 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
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441 WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
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442 EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
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443 OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
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444 KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
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445 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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446 PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
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447 LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
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448 THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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449
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450 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
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451 WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
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452 AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
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453 FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
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454 CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
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455 LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
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456 RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
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457 FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
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458 SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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459 DAMAGES.
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460
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461 END OF TERMS AND CONDITIONS
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462 ^L
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463 How to Apply These Terms to Your New Libraries
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464
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465 If you develop a new library, and you want it to be of the greatest
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466 possible use to the public, we recommend making it free software that
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467 everyone can redistribute and change. You can do so by permitting
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468 redistribution under these terms (or, alternatively, under the terms
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469 of the ordinary General Public License).
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470
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471 To apply these terms, attach the following notices to the library.
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472 It is safest to attach them to the start of each source file to most
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473 effectively convey the exclusion of warranty; and each file should
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474 have at least the "copyright" line and a pointer to where the full
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475 notice is found.
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476
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477
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478 <one line to give the library's name and a brief idea of what it does.>
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479 Copyright (C) <year> <name of author>
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480
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481 This library is free software; you can redistribute it and/or
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482 modify it under the terms of the GNU Lesser General Public
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483 License as published by the Free Software Foundation; either
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484 version 2.1 of the License, or (at your option) any later version.
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485
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486 This library is distributed in the hope that it will be useful,
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487 but WITHOUT ANY WARRANTY; without even the implied warranty of
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488 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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489 Lesser General Public License for more details.
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490
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491 You should have received a copy of the GNU Lesser General Public
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492 License along with this library; if not, write to the Free Software
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493 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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494
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495 Also add information on how to contact you by electronic and paper mail.
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496
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497 You should also get your employer (if you work as a programmer) or
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498 your school, if any, to sign a "copyright disclaimer" for the library,
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499 if necessary. Here is a sample; alter the names:
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500
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501 Yoyodyne, Inc., hereby disclaims all copyright interest in the
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502 library `Frob' (a library for tweaking knobs) written by James
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503 Random Hacker.
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504
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505 <signature of Ty Coon>, 1 April 1990
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506 Ty Coon, President of Vice
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507
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508 That's all there is to it!
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509
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510
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