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xjb04a4022021-11-25 15:01:52 +08001The GNU General Public License (GPL)
2
3Version 2, June 1991
4
5Copyright (C) 1989, 1991 Free Software Foundation, Inc.
659 Temple Place, Suite 330, Boston, MA 02111-1307 USA
7
8Everyone is permitted to copy and distribute verbatim copies
9of this license document, but changing it is not allowed.
10
11Preamble
12
13The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU
14General Public License is intended to guarantee your freedom to share and change free software--to make sure the
15software is free for all its users. This General Public License applies to most of the Free Software Foundation's
16software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is
17covered by the GNU Library General Public License instead.) You can apply it to your programs, too.
18
19When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make
20sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you
21receive source code or can get it if you want it, that you can change the software or use pieces of it in new free
22programs; and that you know you can do these things.
23
24To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to
25surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the
26software, or if you modify it.
27
28For example, if you distribute copies of such a program, whether gratis or for a fee, you must give the recipients all
29the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them
30these terms so they know their rights.
31
32We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you legal
33permission to copy, distribute and/or modify the software.
34
35Also, for each author's protection and ours, we want to make certain that everyone understands that there is no warranty
36for this free software. If the software is modified by someone else and passed on, we want its recipients to know that
37what they have is not the original, so that any problems introduced by others will not reflect on the original authors'
38reputations.
39
40Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors
41of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this,
42we have made it clear that any patent must be licensed for everyone's free use or not licensed at all.
43
44The precise terms and conditions for copying, distribution and modification follow.
45
46TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
47
480. This License applies to any program or other work which contains a notice placed by the copyright holder saying it
49may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or
50work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to
51say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into
52another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is
53addressed as "you".
54
55Activities other than copying, distribution and modification are not covered by this License; they are outside its
56scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents
57constitute a work based on the Program (independent of having been made by running the Program). Whether that is true
58depends on what the Program does.
59
601. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided
61that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of
62warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other
63recipients of the Program a copy of this License along with the Program.
64
65You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection
66in exchange for a fee.
67
682. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and
69copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of
70these conditions:
71
72a) You must cause the modified files to carry prominent notices stating that you changed the files and the date of any
73change.
74
75b) You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the
76Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this
77License.
78
79c) If the modified program normally reads commands interactively when run, you must cause it, when started running for
80such interactive use in the most ordinary way, to print or display an announcement including an appropriate copyright
81notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may
82redistribute the program under these conditions, and telling the user how to view a copy of this License. (Exception: if
83the Program itself is interactive but does not normally print such an announcement, your work based on the Program is
84not required to print an announcement.)
85
86These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the
87Program, and can be reasonably considered independent and separate works in themselves, then this License, and its
88terms, do not apply to those sections when you distribute them as separate works. But when you distribute the same
89sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of
90this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part
91regardless of who wrote it.
92
93Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you;
94rather, the intent is to exercise the right to control the distribution of derivative or collective works based on the
95Program.
96
97In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the
98Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License.
99
1003. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form
101under the terms of Sections 1 and 2 above provided that you also do one of the following:
102
103a) Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms
104of Sections 1 and 2 above on a medium customarily used for software interchange; or,
105
106b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than
107your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source
108code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange;
109or,
110
111c) Accompany it with the information you received as to the offer to distribute corresponding source code. (This
112alternative is allowed only for noncommercial distribution and only if you received the program in object code or
113executable form with such an offer, in accord with Subsection b above.)
114
115The source code for a work means the preferred form of the work for making modifications to it. For an executable work,
116complete source code means all the source code for all modules it contains, plus any associated interface definition
117files, plus the scripts used to control compilation and installation of the executable. However, as a special exception,
118the source code distributed need not include anything that is normally distributed (in either source or binary form)
119with the major components (compiler, kernel, and so on) of the operating system on which the executable runs, unless
120that component itself accompanies the executable.
121
122If distribution of executable or object code is made by offering access to copy from a designated place, then offering
123equivalent access to copy the source code from the same place counts as distribution of the source code, even though
124third parties are not compelled to copy the source along with the object code.
125
1264. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License. Any
127attempt otherwise to copy, modify, sublicense or distribute the Program is void, and will automatically terminate your
128rights under this License. However, parties who have received copies, or rights, from you under this License will not
129have their licenses terminated so long as such parties remain in full compliance.
130
1315. You are not required to accept this License, since you have not signed it. However, nothing else grants you
132permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do
133not accept this License. Therefore, by modifying or distributing the Program (or any work based on the Program), you
134indicate your acceptance of this License to do so, and all its terms and conditions for copying, distributing or
135modifying the Program or works based on it.
136
1376. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a
138license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You
139may not impose any further restrictions on the recipients' exercise of the rights granted herein. You are not
140responsible for enforcing compliance by third parties to this License.
141
1427. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to
143patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the
144conditions of this License, they do not excuse you from the conditions of this License. If you cannot distribute so as
145to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence
146you may not distribute the Program at all. For example, if a patent license would not permit royalty-free redistribution
147of the Program by all those who receive copies directly or indirectly through you, then the only way you could satisfy
148both it and this License would be to refrain entirely from distribution of the Program.
149
150If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the
151section is intended to apply and the section as a whole is intended to apply in other circumstances.
152
153It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest
154validity of any such claims; this section has the sole purpose of protecting the integrity of the free software
155distribution system, which is implemented by public license practices. Many people have made generous contributions to
156the wide range of software distributed through that system in reliance on consistent application of that system; it is
157up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee
158cannot impose that choice.
159
160This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License.
161
1628. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted
163interfaces, the original copyright holder who places the Program under this License may add an explicit geographical
164distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus
165excluded. In such case, this License incorporates the limitation as if written in the body of this License.
166
1679. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time.
168Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or
169concerns.
170
171Each version is given a distinguishing version number. If the Program specifies a version number of this License which
172applies to it and "any later version", you have the option of following the terms and conditions either of that version
173or of any later version published by the Free Software Foundation. If the Program does not specify a version number of
174this License, you may choose any version ever published by the Free Software Foundation.
175
17610. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are
177different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation,
178write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two
179goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of
180software generally.
181
182NO WARRANTY
183
18411. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
185APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM
186"AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
187OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
188PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
189CORRECTION.
190
19112. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY
192WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL,
193SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT
194LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF
195THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY
196OF SUCH DAMAGES.
197
198END OF TERMS AND CONDITIONS
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