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