1 GNU GENERAL PUBLIC LICENSE
2 ==========================
6 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
7 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
9 Everyone is permitted to copy and distribute verbatim copies of this license
10 document, but changing it is not allowed.
15 The licenses for most software are designed to take away your freedom to share
16 and change it. By contrast, the GNU General Public License is intended to
17 guarantee your freedom to share and change free software--to make sure the
18 software is free for all its users. This General Public License applies to most
19 of the Free Software Foundation's software and to any other program whose
20 authors commit to using it. (Some other Free Software Foundation software is
21 covered by the GNU Lesser General Public License instead.) You can apply it to
24 When we speak of free software, we are referring to freedom, not price. Our
25 General Public Licenses are designed to make sure that you have the freedom to
26 distribute copies of free software (and charge for this service if you wish),
27 that you receive source code or can get it if you want it, that you can change
28 the software or use pieces of it in new free programs; and that you know you
31 To protect your rights, we need to make restrictions that forbid anyone to deny
32 you these rights or to ask you to surrender the rights. These restrictions
33 translate to certain responsibilities for you if you distribute copies of the
34 software, or if you modify it.
36 For example, if you distribute copies of such a program, whether gratis or for
37 a fee, you must give the recipients all the rights that you have. You must make
38 sure that they, too, receive or can get the source code. And you must show them
39 these terms so they know their rights.
41 We protect your rights with two steps: (1) copyright the software, and (2)
42 offer you this license which gives you legal permission to copy, distribute
43 and/or modify the software.
45 Also, for each author's protection and ours, we want to make certain that
46 everyone understands that there is no warranty for this free software. If the
47 software is modified by someone else and passed on, we want its recipients to
48 know that what they have is not the original, so that any problems introduced
49 by others will not reflect on the original authors' reputations.
51 Finally, any free program is threatened constantly by software patents. We wish
52 to avoid the danger that redistributors of a free program will individually
53 obtain patent licenses, in effect making the program proprietary. To prevent
54 this, we have made it clear that any patent must be licensed for everyone's
55 free use or not licensed at all.
57 The precise terms and conditions for copying, distribution and modification
60 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
61 ===============================================================
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
66 or 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".
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.
78 1. You may copy and distribute verbatim copies of the Program's source code as
79 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
83 Program a copy of this License along with the Program.
85 You may charge a fee for the physical act of transferring a copy, and you may
86 at your option offer warranty protection in exchange for a fee.
88 2. You may modify your copy or copies of the Program or any portion of it, thus
89 forming a work based on the Program, and copy and distribute such modifications
90 or work under the terms of Section 1 above, provided that you also meet all of
93 a) You must cause the modified files to carry prominent notices stating that
94 you changed the files and the date of any change.
96 b) You must cause any work that you distribute or publish, that in whole or in
97 part contains or is derived from the Program or any part thereof, to be
98 licensed as a whole at no charge to all third parties under the terms of this
101 c) If the modified program normally reads commands interactively when run, you
102 must cause it, when started running for such interactive use in the most
103 ordinary way, to print or display an announcement including an appropriate
104 copyright notice and a notice that there is no warranty (or else, saying that
105 you provide a warranty) and that users may redistribute the program under these
106 conditions, and telling the user how to view a copy of this License.
107 (Exception: if the Program itself is interactive but does not normally print
108 such an announcement, your work based on the Program is not required to print
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
117 of this License, whose permissions for other licensees extend to the entire
118 whole, and thus to each and every part regardless of who wrote it.
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
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
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
132 2 above provided that you also do one of the following:
134 a) Accompany it with the complete corresponding machine-readable source code,
135 which must be distributed under the terms of Sections 1 and 2 above on a medium
136 customarily used for software interchange; or,
138 b) Accompany it with a written offer, valid for at least three years, to give
139 any third party, for a charge no more than your cost of physically performing
140 source distribution, a complete machine-readable copy of the corresponding
141 source code, to be distributed under the terms of Sections 1 and 2 above on a
142 medium customarily used for software interchange; or,
144 c) Accompany it with the information you received as to the offer to distribute
145 corresponding source code. (This alternative is allowed only for noncommercial
146 distribution and only if you received the program in object code or executable
147 form with such an offer, in accord with Subsection b above.)
149 The source code for a work means the preferred form of the work for making
150 modifications to it. For an executable work, complete source code means all the
151 source code for all modules it contains, plus any associated interface
152 definition files, plus the scripts used to control compilation and installation
153 of the executable. However, as a special exception, the source code distributed
154 need not include anything that is normally distributed (in either source or
155 binary form) with the major components (compiler, kernel, and so on) of the
156 operating system on which the executable runs, unless that component itself
157 accompanies the executable.
159 If distribution of executable or object code is made by offering access to copy
160 from a designated place, then offering equivalent access to copy the source
161 code from the same place counts as distribution of the source code, even though
162 third parties are not compelled to copy the source along with the object code.
164 4. You may not copy, modify, sublicense, or distribute the Program except as
165 expressly provided under this License. Any attempt otherwise to copy, modify,
166 sublicense or distribute the Program is void, and will automatically terminate
167 your rights under this License. However, parties who have received copies, or
168 rights, from you under this License will not have their licenses terminated so
169 long as such parties remain in full compliance.
171 5. You are not required to accept this License, since you have not signed it.
172 However, nothing else grants you permission to modify or distribute the Program
173 or its derivative works. These actions are prohibited by law if you do not
174 accept this License. Therefore, by modifying or distributing the Program (or
175 any work based on the Program), you indicate your acceptance of this License to
176 do so, and all its terms and conditions for copying, distributing or modifying
177 the Program or works based on it.
179 6. Each time you redistribute the Program (or any work based on the Program),
180 the recipient automatically receives a license from the original licensor to
181 copy, distribute or modify the Program subject to these terms and conditions.
182 You may not impose any further restrictions on the recipients' exercise of the
183 rights granted herein. You are not responsible for enforcing compliance by
184 third parties to this License.
186 7. If, as a consequence of a court judgment or allegation of patent
187 infringement or for any other reason (not limited to patent issues), conditions
188 are imposed on you (whether by court order, agreement or otherwise) that
189 contradict the conditions of this License, they do not excuse you from the
190 conditions of this License. If you cannot distribute so as to satisfy
191 simultaneously your obligations under this License and any other pertinent
192 obligations, then as a consequence you may not distribute the Program at all.
193 For example, if a patent license would not permit royalty-free redistribution
194 of the Program by all those who receive copies directly or indirectly through
195 you, then the only way you could satisfy both it and this License would be to
196 refrain entirely from distribution of the Program.
198 If any portion of this section is held invalid or unenforceable under any
199 particular circumstance, the balance of the section is intended to apply and
200 the section as a whole is intended to apply in other circumstances.
202 It is not the purpose of this section to induce you to infringe any patents or
203 other property right claims or to contest validity of any such claims; this
204 section has the sole purpose of protecting the integrity of the free software
205 distribution system, which is implemented by public license practices. Many
206 people have made generous contributions to the wide range of software
207 distributed through that system in reliance on consistent application of that
208 system; it is up to the author/donor to decide if he or she is willing to
209 distribute software through any other system and a licensee cannot impose that
212 This section is intended to make thoroughly clear what is believed to be a
213 consequence of the rest of this License.
215 8. If the distribution and/or use of the Program is restricted in certain
216 countries either by patents or by copyrighted interfaces, the original
217 copyright holder who places the Program under this License may add an explicit
218 geographical distribution limitation excluding those countries, so that
219 distribution is permitted only in or among countries not thus excluded. In such
220 case, this License incorporates the limitation as if written in the body of
223 9. The Free Software Foundation may publish revised and/or new versions of the
224 General Public License from time to time. Such new versions will be similar in
225 spirit to the present version, but may differ in detail to address new problems
228 Each version is given a distinguishing version number. If the Program specifies
229 a version number of this License which applies to it and "any later version",
230 you have the option of following the terms and conditions either of that
231 version or of any later version published by the Free Software Foundation. If
232 the Program does not specify a version number of this License, you may choose
233 any version ever published by the Free Software Foundation.
235 10. If you wish to incorporate parts of the Program into other free programs
236 whose distribution conditions are different, write to the author to ask for
237 permission. For software which is copyrighted by the Free Software Foundation,
238 write to the Free Software Foundation; we sometimes make exceptions for this.
239 Our decision will be guided by the two goals of preserving the free status of
240 all derivatives of our free software and of promoting the sharing and reuse of
246 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR
247 THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE
248 STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE
249 PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
250 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
251 FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
252 PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU
253 ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
255 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL
256 ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE
257 PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
258 GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
259 INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA
260 BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
261 FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER
262 OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
264 END OF TERMS AND CONDITIONS
265 ===========================