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+
+1. The GNU General Public License {#the-gnu-general-public-license .chapter}
+=================================
+
+Version 3, 29 June 2007
+
++--------------------------------------+--------------------------------------+
+|                                      | ``` {.display}                       |
+|                                      | Copyright © 2007 Free Software Found |
+|                                      | ation, Inc. http://fsf.org/          |
+|                                      | 51 Franklin St., Floor 5, Boston, MA |
+|                                      |  02110-1335, USA                     |
+|                                      |                                      |
+|                                      | Everyone is permitted to copy and di |
+|                                      | stribute verbatim copies of this lic |
+|                                      | ense document, but changing it is no |
+|                                      | t allowed.                           |
+|                                      | ```                                  |
++--------------------------------------+--------------------------------------+
+
+Preamble {#preamble .heading}
+--------
+
+The 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 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, 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 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 receive 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 denying 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.
+
+For 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
+source 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 legal 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’ sake, 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 run
+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 such
+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
+such 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 constantly 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 to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary. To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+The precise terms and conditions for copying, distribution and
+modification follow.
+
+TERMS AND CONDITIONS {#terms-and-conditions .heading}
+--------------------
+
+1.  **Definitions.**
+
+    “This License” refers to version 3 of the GNU General
+    Public License.
+
+    “Copyright” also means copyright-like laws that apply to other kinds
+    of works, such as semiconductor masks.
+
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+8.  **Additional Terms.**
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+    “Additional permissions” are terms that supplement the terms of this
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+12. **Patents.**
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+    A “contributor” is a copyright holder who authorizes use under this
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+    A patent license is “discriminatory” if it does not include within
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+
+    Nothing in this License shall be construed as excluding or limiting
+    any implied license or other defenses to infringement that may
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+
+13. **No Surrender of Others’ Freedom.**
+
+    If conditions are imposed on you (whether by court order, agreement
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+
+14. **Use with the GNU Affero General Public License.**
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+    Notwithstanding any other provision of this License, you have
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+    License, section 13, concerning interaction through a network will
+    apply to the combination as such.
+
+15. **Revised Versions of this License.**
+
+    The Free Software Foundation may publish revised and/or new versions
+    of the GNU General Public License from time to time. Such new
+    versions will be similar in spirit to the present version, but may
+    differ in detail to address new problems or concerns.
+
+    Each version is given a distinguishing version number. If the
+    Program specifies that a certain numbered version of the GNU General
+    Public License “or any later version” applies to it, you have the
+    option of following the terms and conditions either of that numbered
+    version or of any later version published by the Free
+    Software Foundation. If the Program does not specify a version
+    number of the GNU General Public License, you may choose any version
+    ever published by the Free Software Foundation.
+
+    If the Program specifies that a proxy can decide which future
+    versions of the GNU General Public License can be used, that proxy’s
+    public statement of acceptance of a version permanently authorizes
+    you to choose that version for the Program.
+
+    Later license versions may give you additional or
+    different permissions. However, no additional obligations are
+    imposed on any author or copyright holder as a result of your
+    choosing to follow a later version.
+
+16. **Disclaimer of Warranty.**
+
+    THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+    APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE
+    COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM “AS IS”
+    WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
+    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE
+    RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.
+    SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
+    NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+17. **Limitation of Liability.**
+
+    IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
+    WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES
+    AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR
+    DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL
+    DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM
+    (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
+    INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE
+    OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH
+    HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+    SUCH DAMAGES.
+
+18. **Interpretation of Sections 15 and 16.**
+
+    If the disclaimer of warranty and limitation of liability provided
+    above cannot be given local legal effect according to their terms,
+    reviewing courts shall apply local law that most closely
+    approximates an absolute waiver of all civil liability in connection
+    with the Program, unless a warranty or assumption of liability
+    accompanies a copy of the Program in return for a fee.
+
+END OF TERMS AND CONDITIONS {#end-of-terms-and-conditions .heading}
+---------------------------
+
+How to Apply These Terms to Your New Programs {#how-to-apply-these-terms-to-your-new-programs .heading}
+---------------------------------------------
+
+If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these
+terms.
+
+To do so, attach the following notices to the program. It is safest to
+attach them to the start of each source file to most effectively state
+the exclusion of warranty; and each file should have at least the
+“copyright” line and a pointer to where the full notice is found.
+
++--------------------------------------+--------------------------------------+
+|                                      | ``` {.smallexample}                  |
+|                                      | one line to give the program's name  |
+|                                      | and a brief idea of what it does.    |
+|                                      | Copyright (C) year name of author    |
+|                                      |                                      |
+|                                      | This program is free software: you c |
+|                                      | an redistribute it and/or modify     |
+|                                      | it under the terms of the GNU Genera |
+|                                      | l Public License as published by     |
+|                                      | the Free Software Foundation, either |
+|                                      |  version 3 of the License, or (at    |
+|                                      | your option) any later version.      |
+|                                      |                                      |
+|                                      | This program is distributed in the h |
+|                                      | ope that it will be useful, but      |
+|                                      | WITHOUT ANY WARRANTY; without even t |
+|                                      | he implied warranty of               |
+|                                      | MERCHANTABILITY or FITNESS FOR A PAR |
+|                                      | TICULAR PURPOSE.  See the GNU        |
+|                                      | General Public License for more deta |
+|                                      | ils.                                 |
+|                                      |                                      |
+|                                      | You should have received a copy of t |
+|                                      | he GNU General Public License        |
+|                                      | along with this program.  If not, se |
+|                                      | e http://www.gnu.org/licenses/.      |
+|                                      | ```                                  |
++--------------------------------------+--------------------------------------+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program does terminal interaction, make it output a short notice
+like this when it starts in an interactive mode:
+
++--------------------------------------+--------------------------------------+
+|                                      | ``` {.smallexample}                  |
+|                                      | program Copyright (C) year name of a |
+|                                      | uthor                                |
+|                                      | This program comes with ABSOLUTELY N |
+|                                      | O WARRANTY;                          |
+|                                      | for details type ‘show w’.  This is  |
+|                                      | free software,                       |
+|                                      | and you are welcome to redistribute  |
+|                                      | it under                             |
+|                                      | certain conditions; type ‘show c’ fo |
+|                                      | r details.                           |
+|                                      | ```                                  |
++--------------------------------------+--------------------------------------+
+
+The hypothetical commands ‘show w’ and ‘show c’ should show the
+appropriate parts of the General Public License. Of course, your
+program’s commands might be different; for a GUI interface, you would
+use an “about box”.
+
+You should also get your employer (if you work as a programmer) or
+school, if any, to sign a “copyright disclaimer” for the program, if
+necessary. For more information on this, and how to apply and follow the
+GNU GPL, see <http://www.gnu.org/licenses/>.
+
+The GNU General Public License does not permit incorporating your
+program into proprietary programs. If your program is a subroutine
+library, you may consider it more useful to permit linking proprietary
+applications with the library. If this is what you want to do, use the
+GNU Lesser General Public License instead of this License. But first,
+please read <http://www.gnu.org/philosophy/why-not-lgpl.html>.
+
+------------------------------------------------------------------------
+
+This document was generated by *tonghuix* on *March 25, 2016* using
+[*texi2html 1.82*](http://www.nongnu.org/texi2html/).\