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1 | The GNU General Public License, Version 2, June 1991 (GPLv2) |
2 | ============================================================ |
3 | |
4 | > Copyright (C) 1989, 1991 Free Software Foundation, Inc. |
5 | > 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA |
6 | |
7 | Everyone is permitted to copy and distribute verbatim copies of this license |
8 | document, but changing it is not allowed. |
9 | |
10 | |
11 | Preamble |
12 | -------- |
13 | |
14 | The licenses for most software are designed to take away your freedom to share |
15 | and change it. By contrast, the GNU General Public License is intended to |
16 | guarantee your freedom to share and change free software--to make sure the |
17 | software is free for all its users. This General Public License applies to most |
18 | of the Free Software Foundation's software and to any other program whose |
19 | authors commit to using it. (Some other Free Software Foundation software is |
20 | covered by the GNU Lesser General Public License instead.) You can apply it to |
21 | your programs, too. |
22 | |
23 | When we speak of free software, we are referring to freedom, not price. Our |
24 | General Public Licenses are designed to make sure that you have the freedom to |
25 | distribute copies of free software (and charge for this service if you wish), |
26 | that you receive source code or can get it if you want it, that you can change |
27 | the software or use pieces of it in new free programs; and that you know you can |
28 | do these things. |
29 | |
30 | To protect your rights, we need to make restrictions that forbid anyone to deny |
31 | you these rights or to ask you to surrender the rights. These restrictions |
32 | translate to certain responsibilities for you if you distribute copies of the |
33 | software, or if you modify it. |
34 | |
35 | For example, if you distribute copies of such a program, whether gratis or for a |
36 | fee, you must give the recipients all the rights that you have. You must make |
37 | sure that they, too, receive or can get the source code. And you must show them |
38 | these terms so they know their rights. |
39 | |
40 | We protect your rights with two steps: (1) copyright the software, and (2) offer |
41 | you this license which gives you legal permission to copy, distribute and/or |
42 | modify the software. |
43 | |
44 | Also, for each author's protection and ours, we want to make certain that |
45 | everyone understands that there is no warranty for this free software. If the |
46 | software is modified by someone else and passed on, we want its recipients to |
47 | know that what they have is not the original, so that any problems introduced by |
48 | others will not reflect on the original authors' reputations. |
49 | |
50 | Finally, any free program is threatened constantly by software patents. We wish |
51 | to avoid the danger that redistributors of a free program will individually |
52 | obtain patent licenses, in effect making the program proprietary. To prevent |
53 | this, we have made it clear that any patent must be licensed for everyone's free |
54 | use or not licensed at all. |
55 | |
56 | The precise terms and conditions for copying, distribution and modification |
57 | follow. |
58 | |
59 | |
60 | Terms And Conditions For Copying, Distribution And Modification |
61 | --------------------------------------------------------------- |
62 | |
63 | **0.** This License applies to any program or other work which contains a notice |
64 | placed by the copyright holder saying it may be distributed under the terms of |
65 | this General Public License. The "Program", below, refers to any such program or |
66 | work, and a "work based on the Program" means either the Program or any |
67 | derivative work under copyright law: that is to say, a work containing the |
68 | Program or a portion of it, either verbatim or with modifications and/or |
69 | translated into another language. (Hereinafter, translation is included without |
70 | limitation in the term "modification".) Each licensee is addressed as "you". |
71 | |
72 | Activities other than copying, distribution and modification are not covered by |
73 | this License; they are outside its scope. The act of running the Program is not |
74 | restricted, and the output from the Program is covered only if its contents |
75 | constitute a work based on the Program (independent of having been made by |
76 | running the Program). Whether that is true depends on what the Program does. |
77 | |
78 | **1.** You may copy and distribute verbatim copies of the Program's source code |
79 | as you receive it, in any medium, provided that you conspicuously and |
80 | appropriately publish on each copy an appropriate copyright notice and |
81 | disclaimer of warranty; keep intact all the notices that refer to this License |
82 | and to the absence of any warranty; and give any other recipients of the Program |
83 | a copy of this License along with the Program. |
84 | |
85 | You may charge a fee for the physical act of transferring a copy, and you may at |
86 | your option offer warranty protection in exchange for a fee. |
87 | |
88 | **2.** You may modify your copy or copies of the Program or any portion of it, |
89 | thus forming a work based on the Program, and copy and distribute such |
90 | modifications or work under the terms of Section 1 above, provided that you also |
91 | meet all of these conditions: |
92 | |
93 | * **a)** You must cause the modified files to carry prominent notices stating |
94 | that you changed the files and the date of any change. |
95 | |
96 | * **b)** You must cause any work that you distribute or publish, that in whole |
97 | or in part contains or is derived from the Program or any part thereof, to |
98 | be licensed as a whole at no charge to all third parties under the terms of |
99 | this License. |
100 | |
101 | * **c)** If the modified program normally reads commands interactively when |
102 | run, you must cause it, when started running for such interactive use in the |
103 | most ordinary way, to print or display an announcement including an |
104 | appropriate copyright notice and a notice that there is no warranty (or |
105 | else, saying that you provide a warranty) and that users may redistribute |
106 | the program under these conditions, and telling the user how to view a copy |
107 | of this License. (Exception: if the Program itself is interactive but does |
108 | not normally print such an announcement, your work based on the Program is |
109 | not required to print an announcement.) |
110 | |
111 | These requirements apply to the modified work as a whole. If identifiable |
112 | sections of that work are not derived from the Program, and can be reasonably |
113 | considered independent and separate works in themselves, then this License, and |
114 | its terms, do not apply to those sections when you distribute them as separate |
115 | works. But when you distribute the same sections as part of a whole which is a |
116 | work based on the Program, the distribution of the whole must be on the terms of |
117 | this License, whose permissions for other licensees extend to the entire whole, |
118 | and thus to each and every part regardless of who wrote it. |
119 | |
120 | Thus, it is not the intent of this section to claim rights or contest your |
121 | rights to work written entirely by you; rather, the intent is to exercise the |
122 | right to control the distribution of derivative or collective works based on the |
123 | Program. |
124 | |
125 | In addition, mere aggregation of another work not based on the Program with the |
126 | Program (or with a work based on the Program) on a volume of a storage or |
127 | distribution medium does not bring the other work under the scope of this |
128 | License. |
129 | |
130 | **3.** You may copy and distribute the Program (or a work based on it, under |
131 | Section 2) in object code or executable form under the terms of Sections 1 and 2 |
132 | above provided that you also do one of the following: |
133 | |
134 | * **a)** Accompany it with the complete corresponding machine-readable source |
135 | code, which must be distributed under the terms of Sections 1 and 2 above on |
136 | a medium customarily used for software interchange; or, |
137 | |
138 | * **b)** Accompany it with a written offer, valid for at least three years, to |
139 | give any third party, for a charge no more than your cost of physically |
140 | performing source distribution, a complete machine-readable copy of the |
141 | corresponding source code, to be distributed under the terms of Sections 1 |
142 | and 2 above on a medium customarily used for software interchange; or, |
143 | |
144 | * **c)** Accompany it with the information you received as to the offer to |
145 | distribute corresponding source code. (This alternative is allowed only for |
146 | noncommercial distribution and only if you received the program in object |
147 | code or executable form with such an offer, in accord with Subsection b |
148 | above.) |
149 | |
150 | The source code for a work means the preferred form of the work for making |
151 | modifications to it. For an executable work, complete source code means all the |
152 | source code for all modules it contains, plus any associated interface |
153 | definition files, plus the scripts used to control compilation and installation |
154 | of the executable. However, as a special exception, the source code distributed |
155 | need not include anything that is normally distributed (in either source or |
156 | binary form) with the major components (compiler, kernel, and so on) of the |
157 | operating system on which the executable runs, unless that component itself |
158 | accompanies the executable. |
159 | |
160 | If distribution of executable or object code is made by offering access to copy |
161 | from a designated place, then offering equivalent access to copy the source code |
162 | from the same place counts as distribution of the source code, even though third |
163 | parties are not compelled to copy the source along with the object code. |
164 | |
165 | **4.** You may not copy, modify, sublicense, or distribute the Program except as |
166 | expressly provided under this License. Any attempt otherwise to copy, modify, |
167 | sublicense or distribute the Program is void, and will automatically terminate |
168 | your rights under this License. However, parties who have received copies, or |
169 | rights, from you under this License will not have their licenses terminated so |
170 | long as such parties remain in full compliance. |
171 | |
172 | **5.** You are not required to accept this License, since you have not signed |
173 | it. However, nothing else grants you permission to modify or distribute the |
174 | Program or its derivative works. These actions are prohibited by law if you do |
175 | not accept this License. Therefore, by modifying or distributing the Program (or |
176 | any work based on the Program), you indicate your acceptance of this License to |
177 | do so, and all its terms and conditions for copying, distributing or modifying |
178 | the Program or works based on it. |
179 | |
180 | **6.** Each time you redistribute the Program (or any work based on the |
181 | Program), the recipient automatically receives a license from the original |
182 | licensor to copy, distribute or modify the Program subject to these terms and |
183 | conditions. You may not impose any further restrictions on the recipients' |
184 | exercise of the rights granted herein. You are not responsible for enforcing |
185 | compliance by third parties to this License. |
186 | |
187 | **7.** If, as a consequence of a court judgment or allegation of patent |
188 | infringement or for any other reason (not limited to patent issues), conditions |
189 | are imposed on you (whether by court order, agreement or otherwise) that |
190 | contradict the conditions of this License, they do not excuse you from the |
191 | conditions of this License. If you cannot distribute so as to satisfy |
192 | simultaneously your obligations under this License and any other pertinent |
193 | obligations, then as a consequence you may not distribute the Program at all. |
194 | For example, if a patent license would not permit royalty-free redistribution of |
195 | the Program by all those who receive copies directly or indirectly through you, |
196 | then the only way you could satisfy both it and this License would be to refrain |
197 | entirely from distribution of the Program. |
198 | |
199 | If any portion of this section is held invalid or unenforceable under any |
200 | particular circumstance, the balance of the section is intended to apply and the |
201 | section as a whole is intended to apply in other circumstances. |
202 | |
203 | It is not the purpose of this section to induce you to infringe any patents or |
204 | other property right claims or to contest validity of any such claims; this |
205 | section has the sole purpose of protecting the integrity of the free software |
206 | distribution system, which is implemented by public license practices. Many |
207 | people have made generous contributions to the wide range of software |
208 | distributed through that system in reliance on consistent application of that |
209 | system; it is up to the author/donor to decide if he or she is willing to |
210 | distribute software through any other system and a licensee cannot impose that |
211 | choice. |
212 | |
213 | This section is intended to make thoroughly clear what is believed to be a |
214 | consequence of the rest of this License. |
215 | |
216 | **8.** If the distribution and/or use of the Program is restricted in certain |
217 | countries either by patents or by copyrighted interfaces, the original copyright |
218 | holder who places the Program under this License may add an explicit |
219 | geographical distribution limitation excluding those countries, so that |
220 | distribution is permitted only in or among countries not thus excluded. In such |
221 | case, this License incorporates the limitation as if written in the body of this |
222 | License. |
223 | |
224 | **9.** The Free Software Foundation may publish revised and/or new versions of |
225 | the General Public License from time to time. Such new versions will be similar |
226 | in spirit to the present version, but may differ in detail to address new |
227 | problems or concerns. |
228 | |
229 | Each version is given a distinguishing version number. If the Program specifies |
230 | a version number of this License which applies to it and "any later version", |
231 | you have the option of following the terms and conditions either of that version |
232 | or of any later version published by the Free Software Foundation. If the |
233 | Program does not specify a version number of this License, you may choose any |
234 | version ever published by the Free Software Foundation. |
235 | |
236 | **10.** If you wish to incorporate parts of the Program into other free programs |
237 | whose distribution conditions are different, write to the author to ask for |
238 | permission. For software which is copyrighted by the Free Software Foundation, |
239 | write to the Free Software Foundation; we sometimes make exceptions for this. |
240 | Our decision will be guided by the two goals of preserving the free status of |
241 | all derivatives of our free software and of promoting the sharing and reuse of |
242 | software generally. |
243 | |
244 | |
245 | No Warranty |
246 | ----------- |
247 | |
248 | **11.** BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR |
249 | THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE |
250 | STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM |
251 | "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, |
252 | BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
253 | PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE |
254 | PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF |
255 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. |
256 | |
257 | **12.** IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING |
258 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE |
259 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY |
260 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR |
261 | INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA |
262 | BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A |
263 | FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER |
264 | OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. |