2 GNU GENERAL PUBLIC LICENSE
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7 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
8 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
9 Everyone is permitted to copy and distribute verbatim copies
10 of this license document, but changing it is not allowed.
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16 The licenses for most software are designed to take away your
17 freedom to share and change it. By contrast, the GNU General Public
18 License is intended to guarantee your freedom to share and change free
19 software--to make sure the software is free for all its users. This
20 General Public License applies to most of the Free Software
21 Foundation's software and to any other program whose authors commit to
22 using it. (Some other Free Software Foundation software is covered by
23 the GNU Library General Public License instead.) You can apply it to
26 When we speak of free software, we are referring to freedom, not
27 price. Our General Public Licenses are designed to make sure that you
28 have the freedom to distribute copies of free software (and charge for
29 this service if you wish), that you receive source code or can get it
30 if you want it, that you can change the software or use pieces of it
31 in new free programs; and that you know you can do these things.
33 To protect your rights, we need to make restrictions that forbid
34 anyone to deny you these rights or to ask you to surrender the rights.
35 These restrictions translate to certain responsibilities for you if you
36 distribute copies of the software, or if you modify it.
38 For example, if you distribute copies of such a program, whether
39 gratis or for a fee, you must give the recipients all the rights that
40 you have. You must make sure that they, too, receive or can get the
41 source code. And you must show them these terms so they know their
44 We protect your rights with two steps: (1) copyright the software, and
45 (2) offer you this license which gives you legal permission to copy,
46 distribute and/or modify the software.
48 Also, for each author's protection and ours, we want to make certain
49 that everyone understands that there is no warranty for this free
50 software. If the software is modified by someone else and passed on, we
51 want its recipients to know that what they have is not the original, so
52 that any problems introduced by others will not reflect on the original
55 Finally, any free program is threatened constantly by software
56 patents. We wish to avoid the danger that redistributors of a free
57 program will individually obtain patent licenses, in effect making the
58 program proprietary. To prevent this, we have made it clear that any
59 patent must be licensed for everyone's free use or not licensed at all.
61 The precise terms and conditions for copying, distribution and
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66 GNU GENERAL PUBLIC LICENSE
67 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
69 0. This License applies to any program or other work which contains
70 a notice placed by the copyright holder saying it may be distributed
71 under the terms of this General Public License. The "Program", below,
72 refers to any such program or work, and a "work based on the Program"
73 means either the Program or any derivative work under copyright law:
74 that is to say, a work containing the Program or a portion of it,
75 either verbatim or with modifications and/or translated into another
76 language. (Hereinafter, translation is included without limitation in
77 the term "modification".) Each licensee is addressed as "you".
79 Activities other than copying, distribution and modification are not
80 covered by this License; they are outside its scope. The act of
81 running the Program is not restricted, and the output from the Program
82 is covered only if its contents constitute a work based on the
83 Program (independent of having been made by running the Program).
84 Whether that is true depends on what the Program does.
86 1. You may copy and distribute verbatim copies of the Program's
87 source code as you receive it, in any medium, provided that you
88 conspicuously and appropriately publish on each copy an appropriate
89 copyright notice and disclaimer of warranty; keep intact all the
90 notices that refer to this License and to the absence of any warranty;
91 and give any other recipients of the Program a copy of this License
92 along with the Program.
94 You may charge a fee for the physical act of transferring a copy, and
95 you may at your option offer warranty protection in exchange for a fee.
97 2. You may modify your copy or copies of the Program or any portion
98 of it, thus forming a work based on the Program, and copy and
99 distribute such modifications or work under the terms of Section 1
100 above, provided that you also meet all of these conditions:
102 a) You must cause the modified files to carry prominent notices
103 stating that you changed the files and the date of any change.
105 b) You must cause any work that you distribute or publish, that in
106 whole or in part contains or is derived from the Program or any
107 part thereof, to be licensed as a whole at no charge to all third
108 parties under the terms of this License.
110 c) If the modified program normally reads commands interactively
111 when run, you must cause it, when started running for such
112 interactive use in the most ordinary way, to print or display an
113 announcement including an appropriate copyright notice and a
114 notice that there is no warranty (or else, saying that you provide
115 a warranty) and that users may redistribute the program under
116 these conditions, and telling the user how to view a copy of this
117 License. (Exception: if the Program itself is interactive but
118 does not normally print such an announcement, your work based on
119 the Program is not required to print an announcement.)
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123 These requirements apply to the modified work as a whole. If
124 identifiable sections of that work are not derived from the Program,
125 and can be reasonably considered independent and separate works in
126 themselves, then this License, and its terms, do not apply to those
127 sections when you distribute them as separate works. But when you
128 distribute the same sections as part of a whole which is a work based
129 on the Program, the distribution of the whole must be on the terms of
130 this License, whose permissions for other licensees extend to the
131 entire whole, and thus to each and every part regardless of who wrote it.
133 Thus, it is not the intent of this section to claim rights or contest
134 your rights to work written entirely by you; rather, the intent is to
135 exercise the right to control the distribution of derivative or
136 collective works based on the Program.
138 In addition, mere aggregation of another work not based on the Program
139 with the Program (or with a work based on the Program) on a volume of
140 a storage or distribution medium does not bring the other work under
141 the scope of this License.
143 3. You may copy and distribute the Program (or a work based on it,
144 under Section 2) in object code or executable form under the terms of
145 Sections 1 and 2 above provided that you also do one of the following:
147 a) Accompany it with the complete corresponding machine-readable
148 source code, which must be distributed under the terms of Sections
149 1 and 2 above on a medium customarily used for software interchange; or,
151 b) Accompany it with a written offer, valid for at least three
152 years, to give any third party, for a charge no more than your
153 cost of physically performing source distribution, a complete
154 machine-readable copy of the corresponding source code, to be
155 distributed under the terms of Sections 1 and 2 above on a medium
156 customarily used for software interchange; or,
158 c) Accompany it with the information you received as to the offer
159 to distribute corresponding source code. (This alternative is
160 allowed only for noncommercial distribution and only if you
161 received the program in object code or executable form with such
162 an offer, in accord with Subsection b above.)
164 The source code for a work means the preferred form of the work for
165 making modifications to it. For an executable work, complete source
166 code means all the source code for all modules it contains, plus any
167 associated interface definition files, plus the scripts used to
168 control compilation and installation of the executable. However, as a
169 special exception, the source code distributed need not include
170 anything that is normally distributed (in either source or binary
171 form) with the major components (compiler, kernel, and so on) of the
172 operating system on which the executable runs, unless that component
173 itself accompanies the executable.
175 If distribution of executable or object code is made by offering
176 access to copy from a designated place, then offering equivalent
177 access to copy the source code from the same place counts as
178 distribution of the source code, even though third parties are not
179 compelled to copy the source along with the object code.
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183 4. You may not copy, modify, sublicense, or distribute the Program
184 except as expressly provided under this License. Any attempt
185 otherwise to copy, modify, sublicense or distribute the Program is
186 void, and will automatically terminate your rights under this License.
187 However, parties who have received copies, or rights, from you under
188 this License will not have their licenses terminated so long as such
189 parties remain in full compliance.
191 5. You are not required to accept this License, since you have not
192 signed it. However, nothing else grants you permission to modify or
193 distribute the Program or its derivative works. These actions are
194 prohibited by law if you do not accept this License. Therefore, by
195 modifying or distributing the Program (or any work based on the
196 Program), you indicate your acceptance of this License to do so, and
197 all its terms and conditions for copying, distributing or modifying
198 the Program or works based on it.
200 6. Each time you redistribute the Program (or any work based on the
201 Program), the recipient automatically receives a license from the
202 original licensor to copy, distribute or modify the Program subject to
203 these terms and conditions. You may not impose any further
204 restrictions on the recipients' exercise of the rights granted herein.
205 You are not responsible for enforcing compliance by third parties to
208 7. If, as a consequence of a court judgment or allegation of patent
209 infringement or for any other reason (not limited to patent issues),
210 conditions are imposed on you (whether by court order, agreement or
211 otherwise) that contradict the conditions of this License, they do not
212 excuse you from the conditions of this License. If you cannot
213 distribute so as to satisfy simultaneously your obligations under this
214 License and any other pertinent obligations, then as a consequence you
215 may not distribute the Program at all. For example, if a patent
216 license would not permit royalty-free redistribution of the Program by
217 all those who receive copies directly or indirectly through you, then
218 the only way you could satisfy both it and this License would be to
219 refrain entirely from distribution of the Program.
221 If any portion of this section is held invalid or unenforceable under
222 any particular circumstance, the balance of the section is intended to
223 apply and the section as a whole is intended to apply in other
226 It is not the purpose of this section to induce you to infringe any
227 patents or other property right claims or to contest validity of any
228 such claims; this section has the sole purpose of protecting the
229 integrity of the free software distribution system, which is
230 implemented by public license practices. Many people have made
231 generous contributions to the wide range of software distributed
232 through that system in reliance on consistent application of that
233 system; it is up to the author/donor to decide if he or she is willing
234 to distribute software through any other system and a licensee cannot
237 This section is intended to make thoroughly clear what is believed to
238 be a consequence of the rest of this License.
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242 8. If the distribution and/or use of the Program is restricted in
243 certain countries either by patents or by copyrighted interfaces, the
244 original copyright holder who places the Program under this License
245 may add an explicit geographical distribution limitation excluding
246 those countries, so that distribution is permitted only in or among
247 countries not thus excluded. In such case, this License incorporates
248 the limitation as if written in the body of this License.
250 9. The Free Software Foundation may publish revised and/or new versions
251 of the General Public License from time to time. Such new versions will
252 be similar in spirit to the present version, but may differ in detail to
253 address new problems or concerns.
255 Each version is given a distinguishing version number. If the Program
256 specifies a version number of this License which applies to it and "any
257 later version", you have the option of following the terms and conditions
258 either of that version or of any later version published by the Free
259 Software Foundation. If the Program does not specify a version number of
260 this License, you may choose any version ever published by the Free Software
263 10. If you wish to incorporate parts of the Program into other free
264 programs whose distribution conditions are different, write to the author
265 to ask for permission. For software which is copyrighted by the Free
266 Software Foundation, write to the Free Software Foundation; we sometimes
267 make exceptions for this. Our decision will be guided by the two goals
268 of preserving the free status of all derivatives of our free software and
269 of promoting the sharing and reuse of software generally.
273 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
274 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
275 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
276 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
277 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
278 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
279 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
280 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
281 REPAIR OR CORRECTION.
283 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
284 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
285 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
286 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
287 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
288 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
289 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
290 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
291 POSSIBILITY OF SUCH DAMAGES.
293 END OF TERMS AND CONDITIONS