licence_gpl.txt

1、 GNU GENERAL PUBLIC LICENSEVersion 3, 29 June 2007Copyright (C) 2007 Free Software Foundation, Inc. Everyone is permitted to copy and distribute verbatim copiesof this license document, but changing it

2、 is not allowed.PreambleThe GNU General Public License is a free, copyleft license for software and other kinds of works.The licenses for most software and other practical works are designed to take away your freedom to

3、share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We,

4、the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too.When we speak of free

5、 software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for them if you wish), that you receiv

6、e source code or can get it if you want it, that you can change the software or use pieces of it in new free programs, and that you know you can do these things.To protect your rights, we need to prevent others from deny

7、ing you these rights or asking you to surrender the rights. Therefore, you have certain responsibilities if you distribute copies of the software, or if you modify it: responsibilities to respect the freedom of others.F

8、or example, if you distribute copies of such a program, whether gratis or for a fee, you must pass on to the recipients the same freedoms that you received. You must make sure that they, too, receive or can get the sour

9、ce code. And you must show them these terms so they know their rights.Developers that use the GNU GPL protect your rights with two steps: (1) assert copyright on the software, and (2) offer you this License giving you l

10、egal permission to copy, distribute and/or modify it.For the developers' and authors' protection, the GPL clearly explains that there is no warranty for this free software. For both users' and authors' s

11、ake, the GPL requires that modified versions be marked as changed, so that their problems will not be attributed erroneously to authors of previous versions.Some devices are designed to deny users access to install or ru

12、n modified versions of the software inside them, although the manufacturer can do so. This is fundamentally incompatible with the aim of protecting users' freedom to change the software. The systematic pattern of s

13、uch abuse occurs in the area of products for individuals to use, which is precisely where it is most unacceptable. Therefore, we have designed this version of the GPL to prohibit the practice for those products. If suc

14、h problems arise substantially in other domains, we stand ready to extend this provision to those domains in future versions of the GPL, as needed to protect the freedom of users.Finally, every program is threatened cons

15、tantly by software patents. States should not allow patents to restrict development and use of software on general-purpose computers, but in those that do, we wish toimplementation is available to the public in source co

16、de form. A “Major Component“, in this context, means a major essential component (kernel, window system, and so on) of the specific operating system (if any) on which the executable work runs, or a compiler used to prod

17、uce the work, or an object code interpreter used to run it.The “Corresponding Source“ for a work in object code form means all the source code needed to generate, install, and (for an executable work) run the object code

18、 and to modify the work, including scripts to control those activities. However, it does not include the work's System Libraries, or general-purpose tools or generally available free programs which are used unmodifi

19、ed in performing those activities but which are not part of the work. For example, Corresponding Source includes interface definition files associated with source files for the work, and the source code for shared libra

20、ries and dynamically linked subprograms that the work is specifically designed to require, such as by intimate data communication or control flow between those subprograms and other parts of the work.The Corresponding So

21、urce need not include anything that users can regenerate automatically from other parts of the Corresponding Source.The Corresponding Source for a work in source code form is that same work.2. Basic Permissions.All right

22、s granted under this License are granted for the term of copyright on the Program, and are irrevocable provided the stated conditions are met. This License explicitly affirms your unlimited permission to run the unmodif

23、ied Program. The output from running a covered work is covered by this License only if the output, given its content, constitutes a covered work. This License acknowledges your rights of fair use or other equivalent, a

24、s provided by copyright law.You may make, run and propagate covered works that you do not convey, without conditions so long as your license otherwise remains in force. You may convey covered works to others for the sol

25、e purpose of having them make modifications exclusively for you, or provide you with facilities for running those works, provided that you comply with the terms of this License in conveying all material for which you do

26、not control copyright. Those thus making or running the covered works for you must do so exclusively on your behalf, under your direction and control, on terms that prohibit them from making any copies of your copyright

27、ed material outside their relationship with you.Conveying under any other circumstances is permitted solely under the conditions stated below. Sublicensing is not allowed; section 10 makes it unnecessary.3. Protecting U

28、sers' Legal Rights From Anti-Circumvention Law.No covered work shall be deemed part of an effective technological measure under any applicable law fulfilling obligations under article 11 of the WIPO copyright treaty

29、adopted on 20 December 1996, or similar laws prohibiting or restricting circumvention of such measures.When you convey a covered work, you waive any legal power to forbid circumvention of technological measures to the ex

30、tent such circumvention is effected by exercising rights under this License with respect to the covered work, and you disclaim any intention to limit operation or modification of the work as a means of enforcing, against