1 | GNU GENERAL PUBLIC LICENSE
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2 |
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3 | Version 2, June 1991
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4 |
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5 | Copyright (C) 1989, 1991 Free Software Foundation, Inc. 675 Mass Ave,
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6 | Cambridge, MA 02139, USA. Everyone is permitted to copy and distribute
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7 | verbatim copies of this license document, but changing it is not allowed.
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8 |
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9 | Preamble
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10 |
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11 | The licenses for most software are designed to take away your freedom to
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12 | share and change it. By contrast, the GNU General Public License is
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13 | intended to guarantee your freedom to share and change free software--to
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14 | make sure the software is free for all its users. This General Public License
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15 | applies to most of the Free Software Foundation's software and to any other
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16 | program whose authors commit to using it. (Some other Free Software
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17 | Foundation software is covered by the GNU Library General Public License
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18 | instead.) You can apply it to your programs, too.
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19 |
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20 | When we speak of free software, we are referring to freedom, not price. Our
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21 | General Public Licenses are designed to make sure that you have the
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22 | freedom to distribute copies of free software (and charge for this service if
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23 | you wish), that you receive source code or can get it if you want it, that you
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24 | can change the software or use pieces of it in new free programs; and that
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25 | you know you can do these things.
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26 |
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27 | To protect your rights, we need to make restrictions that forbid anyone to
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28 | deny you these rights or to ask you to surrender the rights. These restrictions
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29 | translate to certain responsibilities for you if you distribute copies of the
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30 | software, or if you modify it.
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31 |
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32 | For example, if you distribute copies of such a program, whether gratis or for
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33 | a fee, you must give the recipients all the rights that you have. You must make
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34 | sure that they, too, receive or can get the source code. And you must show
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35 | them these terms so they know their rights.
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36 |
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37 | We protect your rights with two steps: (1) copyright the software, and (2)
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38 | offer you this license which gives you legal permission to copy, distribute
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39 | and/or modify the software.
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40 |
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41 | Also, for each author's protection and ours, we want to make certain that
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42 | everyone understands that there is no warranty for this free software. If the
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43 | software is modified by someone else and passed on, we want its recipients
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44 | to know that what they have is not the original, so that any problems
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45 | introduced by others will not reflect on the original authors' reputations.
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46 |
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47 | Finally, any free program is threatened constantly by software patents. We
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48 | wish to avoid the danger that redistributors of a free program will individually
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49 | obtain patent licenses, in effect making the program proprietary. To prevent
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50 | this, we have made it clear that any patent must be licensed for everyone's
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51 | free use or not licensed at all.
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52 |
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53 | The precise terms and conditions for copying, distribution and modification
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54 | follow.
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55 |
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56 | GNU GENERAL PUBLIC LICENSE
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57 | TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND
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58 | MODIFICATION
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59 |
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60 | 0. This License applies to any program or other work which contains a notice
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61 | placed by the copyright holder saying it may be distributed under the terms
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62 | of this General Public License. The "Program", below, refers to any such
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63 | program or work, and a "work based on the Program" means either the
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64 | Program or any derivative work under copyright law: that is to say, a work
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65 | containing the Program or a portion of it, either verbatim or with
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66 | modifications and/or translated into another language. (Hereinafter, translation
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67 | is included without limitation in the term "modification".) Each licensee is
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68 | addressed as "you".
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69 |
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70 | Activities other than copying, distribution and modification are not covered
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71 | by this License; they are outside its scope. The act of running the Program is
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72 | not restricted, and the output from the Program is covered only if its contents
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73 | constitute a work based on the Program (independent of having been made
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74 | by running the Program). Whether that is true depends on what the Program
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75 | does.
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76 |
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77 | 1. You may copy and distribute verbatim copies of the Program's source
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78 | code as you receive it, in any medium, provided that you conspicuously and
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79 | appropriately publish on each copy an appropriate copyright notice and
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80 | disclaimer of warranty; keep intact all the notices that refer to this License
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81 | and to the absence of any warranty; and give any other recipients of the
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82 | Program a copy of this License along with the Program.
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83 |
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84 | You may charge a fee for the physical act of transferring a copy, and you
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85 | may at your option offer warranty protection in exchange for a fee.
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86 |
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87 | 2. You may modify your copy or copies of the Program or any portion of it,
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88 | thus forming a work based on the Program, and copy and distribute such
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89 | modifications or work under the terms of Section 1 above, provided that you
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90 | also meet all of these conditions:
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91 |
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92 | a) You must cause the modified files to carry prominent notices stating that
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93 | you changed the files and the date of any change.
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94 |
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95 | b) You must cause any work that you distribute or publish, that in whole or in
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96 | part contains or is derived from the Program or any part thereof, to be
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97 | licensed as a whole at no charge to all third parties under the terms of this
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98 | License.
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99 |
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100 | c) If the modified program normally reads commands interactively when run,
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101 | you must cause it, when started running for such interactive use in the most
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102 | ordinary way, to print or display an announcement including an appropriate
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103 | copyright notice and a notice that there is no warranty (or else, saying that
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104 | you provide a warranty) and that users may redistribute the program under
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105 | these conditions, and telling the user how to view a copy of this License.
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106 | (Exception: if the Program itself is interactive but does not normally print such
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107 | an announcement, your work based on the Program is not required to print
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108 | an announcement.)
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109 |
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110 | These requirements apply to the modified work as a whole. If identifiable
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111 | sections of that work are not derived from the Program, and can be
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112 | reasonably considered independent and separate works in themselves, then
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113 | this License, and its terms, do not apply to those sections when you distribute
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114 | them as separate works. But when you distribute the same sections as part
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115 | of a whole which is a work based on the Program, the distribution of the
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116 | whole must be on the terms of this License, whose permissions for other
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117 | licensees extend to the entire whole, and thus to each and every part
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118 | regardless of who wrote it.
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119 |
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120 | Thus, it is not the intent of this section to claim rights or contest your rights to
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121 | work written entirely by you; rather, the intent is to exercise the right to
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122 | control the distribution of derivative or collective works based on the
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123 | Program.
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124 |
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125 | In addition, mere aggregation of another work not based on the Program
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126 | with the Program (or with a work based on the Program) on a volume of a
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127 | storage or distribution medium does not bring the other work under the scope
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128 | of this License.
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129 |
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130 | 3. You may copy and distribute the Program (or a work based on it, under
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131 | Section 2) in object code or executable form under the terms of Sections 1
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132 | and 2 above provided that you also do one of the following:
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133 |
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134 | a) Accompany it with the complete corresponding machine-readable source
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135 | code, which must be distributed under the terms of Sections 1 and 2 above
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136 | on a medium customarily used for software interchange; or,
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137 |
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138 | b) Accompany it with a written offer, valid for at least three years, to give
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139 | any third party, for a charge no more than your cost of physically performing
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140 | source distribution, a complete machine-readable copy of the corresponding
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141 | source code, to be distributed under the terms of Sections 1 and 2 above on
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142 | a medium customarily used for software interchange; or,
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143 |
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144 | c) Accompany it with the information you received as to the offer to distribute
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145 | corresponding source code. (This alternative is allowed only for
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146 | noncommercial distribution and only if you received the program in object
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147 | code or executable form with such an offer, in accord with Subsection b
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148 | above.)
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149 |
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150 | The source code for a work means the preferred form of the work for
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151 | making modifications to it. For an executable work, complete source code
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152 | means all the source code for all modules it contains, plus any associated
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153 | interface definition files, plus the scripts used to control compilation and
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154 | installation of the executable. However, as a special exception, the source
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155 | code distributed need not include anything that is normally distributed (in
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156 | either source or binary form) with the major components (compiler, kernel,
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157 | and so on) of the operating system on which the executable runs, unless that
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158 | component itself accompanies the executable.
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159 |
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160 | If distribution of executable or object code is made by offering access to
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161 | copy from a designated place, then offering equivalent access to copy the
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162 | source code from the same place counts as distribution of the source code,
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163 | even though third parties are not compelled to copy the source along with the
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164 | object code.
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165 |
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166 | 4. You may not copy, modify, sublicense, or distribute the Program except as
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167 | expressly provided under this License. Any attempt otherwise to copy,
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168 | modify, sublicense or distribute the Program is void, and will automatically
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169 | terminate your rights under this License. However, parties who have received
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170 | copies, or rights, from you under this License will not have their licenses
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171 | terminated so long as such parties remain in full compliance.
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172 |
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173 | 5. You are not required to accept this License, since you have not signed it.
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174 | However, nothing else grants you permission to modify or distribute the
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175 | Program or its derivative works. These actions are prohibited by law if you
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176 | do not accept this License. Therefore, by modifying or distributing the
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177 | Program (or any work based on the Program), you indicate your acceptance
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178 | of this License to do so, and all its terms and conditions for copying,
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179 | distributing or modifying the Program or works based on it.
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180 |
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181 | 6. Each time you redistribute the Program (or any work based on the
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182 | Program), the recipient automatically receives a license from the original
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183 | licensor to copy, distribute or modify the Program subject to these terms and
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184 | conditions. You may not impose any further restrictions on the recipients'
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185 | exercise of the rights granted herein. You are not responsible for enforcing
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186 | compliance by third parties to this License.
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187 |
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188 | 7. If, as a consequence of a court judgment or allegation of patent
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189 | infringement or for any other reason (not limited to patent issues), conditions
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190 | are imposed on you (whether by court order, agreement or otherwise) that
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191 | contradict the conditions of this License, they do not excuse you from the
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192 | conditions of this License. If you cannot distribute so as to satisfy
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193 | simultaneously your obligations under this License and any other pertinent
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194 | obligations, then as a consequence you may not distribute the Program at all.
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195 | For example, if a patent license would not permit royalty-free redistribution
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196 | of the Program by all those who receive copies directly or indirectly through
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197 | you, then the only way you could satisfy both it and this License would be to
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198 | refrain entirely from distribution of the Program.
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199 |
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200 | If any portion of this section is held invalid or unenforceable under any
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201 | particular circumstance, the balance of the section is intended to apply and
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202 | the section as a whole is intended to apply in other circumstances.
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203 |
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204 | It is not the purpose of this section to induce you to infringe any patents or
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205 | other property right claims or to contest validity of any such claims; this
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206 | section has the sole purpose of protecting the integrity of the free software
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207 | distribution system, which is implemented by public license practices. Many
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208 | people have made generous contributions to the wide range of software
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209 | distributed through that system in reliance on consistent application of that
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210 | system; it is up to the author/donor to decide if he or she is willing to
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211 | distribute software through any other system and a licensee cannot impose
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212 | that choice.
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213 |
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214 | This section is intended to make thoroughly clear what is believed to be a
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215 | consequence of the rest of this License.
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216 |
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217 | 8. If the distribution and/or use of the Program is restricted in certain
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218 | countries either by patents or by copyrighted interfaces, the original copyright
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219 | holder who places the Program under this License may add an explicit
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220 | geographical distribution limitation excluding those countries, so that
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221 | distribution is permitted only in or among countries not thus excluded. In such
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222 | case, this License incorporates the limitation as if written in the body of this
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223 | License.
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224 |
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225 | 9. The Free Software Foundation may publish revised and/or new versions
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226 | of the General Public License from time to time. Such new versions will be
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227 | similar in spirit to the present version, but may differ in detail to address new
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228 | problems or concerns.
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229 |
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230 | Each version is given a distinguishing version number. If the Program specifies
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231 | a version number of this License which applies to it and "any later version",
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232 | you have the option of following the terms and conditions either of that
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233 | version or of any later version published by the Free Software Foundation. If
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234 | the Program does not specify a version number of this License, you may
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235 | choose any version ever published by the Free Software Foundation.
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236 |
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237 | 10. If you wish to incorporate parts of the Program into other free programs
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238 | whose distribution conditions are different, write to the author to ask for
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239 | permission. For software which is copyrighted by the Free Software
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240 | Foundation, write to the Free Software Foundation; we sometimes make
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241 | exceptions for this. Our decision will be guided by the two goals of
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242 | preserving the free status of all derivatives of our free software and of
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243 | promoting the sharing and reuse of software generally.
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244 |
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245 | NO WARRANTY
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246 |
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247 | 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE,
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248 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT
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249 | PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE
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250 | STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
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251 | OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
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252 | WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
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253 | INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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254 | OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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255 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
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256 | PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
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257 | PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
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258 | NECESSARY SERVICING, REPAIR OR CORRECTION.
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259 |
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260 | 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR
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261 | AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR
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262 | ANY OTHER PARTY WHO MAY MODIFY AND/OR
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263 | REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE
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264 | LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL,
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265 | SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
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266 | ARISING OUT OF THE USE OR INABILITY TO USE THE
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267 | PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA
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268 | OR DATA BEING RENDERED INACCURATE OR LOSSES
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269 | SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE
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270 | PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN
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271 | IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF
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272 | THE POSSIBILITY OF SUCH DAMAGES.
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273 |
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274 | END OF TERMS AND CONDITIONS
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