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1### GNU GENERAL PUBLIC LICENSE
2
3Version 3, 29 June 2007
4
5Copyright (C) 2007 Free Software Foundation, Inc.
6<https://fsf.org/>
7
8Everyone is permitted to copy and distribute verbatim copies of this
9license document, but changing it is not allowed.
10
11### Preamble
12
13The GNU General Public License is a free, copyleft license for
14software and other kinds of works.
15
16The licenses for most software and other practical works are designed
17to take away your freedom to share and change the works. By contrast,
18the GNU General Public License is intended to guarantee your freedom
19to share and change all versions of a program--to make sure it remains
20free software for all its users. We, the Free Software Foundation, use
21the GNU General Public License for most of our software; it applies
22also to any other work released this way by its authors. You can apply
23it to your programs, too.
24
25When we speak of free software, we are referring to freedom, not
26price. Our General Public Licenses are designed to make sure that you
27have the freedom to distribute copies of free software (and charge for
28them if you wish), that you receive source code or can get it if you
29want it, that you can change the software or use pieces of it in new
30free programs, and that you know you can do these things.
31
32To protect your rights, we need to prevent others from denying you
33these rights or asking you to surrender the rights. Therefore, you
34have certain responsibilities if you distribute copies of the
35software, or if you modify it: responsibilities to respect the freedom
36of others.
37
38For example, if you distribute copies of such a program, whether
39gratis or for a fee, you must pass on to the recipients the same
40freedoms that you received. You must make sure that they, too, receive
41or can get the source code. And you must show them these terms so they
42know their rights.
43
44Developers that use the GNU GPL protect your rights with two steps:
45(1) assert copyright on the software, and (2) offer you this License
46giving you legal permission to copy, distribute and/or modify it.
47
48For the developers' and authors' protection, the GPL clearly explains
49that there is no warranty for this free software. For both users' and
50authors' sake, the GPL requires that modified versions be marked as
51changed, so that their problems will not be attributed erroneously to
52authors of previous versions.
53
54Some devices are designed to deny users access to install or run
55modified versions of the software inside them, although the
56manufacturer can do so. This is fundamentally incompatible with the
57aim of protecting users' freedom to change the software. The
58systematic pattern of such abuse occurs in the area of products for
59individuals to use, which is precisely where it is most unacceptable.
60Therefore, we have designed this version of the GPL to prohibit the
61practice for those products. If such problems arise substantially in
62other domains, we stand ready to extend this provision to those
63domains in future versions of the GPL, as needed to protect the
64freedom of users.
65
66Finally, every program is threatened constantly by software patents.
67States should not allow patents to restrict development and use of
68software on general-purpose computers, but in those that do, we wish
69to avoid the special danger that patents applied to a free program
70could make it effectively proprietary. To prevent this, the GPL
71assures that patents cannot be used to render the program non-free.
72
73The precise terms and conditions for copying, distribution and
74modification follow.
75
76### TERMS AND CONDITIONS
77
78#### 0. Definitions.
79
80"This License" refers to version 3 of the GNU General Public License.
81
82"Copyright" also means copyright-like laws that apply to other kinds
83of works, such as semiconductor masks.
84
85"The Program" refers to any copyrightable work licensed under this
86License. Each licensee is addressed as "you". "Licensees" and
87"recipients" may be individuals or organizations.
88
89To "modify" a work means to copy from or adapt all or part of the work
90in a fashion requiring copyright permission, other than the making of
91an exact copy. The resulting work is called a "modified version" of
92the earlier work or a work "based on" the earlier work.
93
94A "covered work" means either the unmodified Program or a work based
95on the Program.
96
97To "propagate" a work means to do anything with it that, without
98permission, would make you directly or secondarily liable for
99infringement under applicable copyright law, except executing it on a
100computer or modifying a private copy. Propagation includes copying,
101distribution (with or without modification), making available to the
102public, and in some countries other activities as well.
103
104To "convey" a work means any kind of propagation that enables other
105parties to make or receive copies. Mere interaction with a user
106through a computer network, with no transfer of a copy, is not
107conveying.
108
109An interactive user interface displays "Appropriate Legal Notices" to
110the extent that it includes a convenient and prominently visible
111feature that (1) displays an appropriate copyright notice, and (2)
112tells the user that there is no warranty for the work (except to the
113extent that warranties are provided), that licensees may convey the
114work under this License, and how to view a copy of this License. If
115the interface presents a list of user commands or options, such as a
116menu, a prominent item in the list meets this criterion.
117
118#### 1. Source Code.
119
120The "source code" for a work means the preferred form of the work for
121making modifications to it. "Object code" means any non-source form of
122a work.
123
124A "Standard Interface" means an interface that either is an official
125standard defined by a recognized standards body, or, in the case of
126interfaces specified for a particular programming language, one that
127is widely used among developers working in that language.
128
129The "System Libraries" of an executable work include anything, other
130than the work as a whole, that (a) is included in the normal form of
131packaging a Major Component, but which is not part of that Major
132Component, and (b) serves only to enable use of the work with that
133Major Component, or to implement a Standard Interface for which an
134implementation is available to the public in source code form. A
135"Major Component", in this context, means a major essential component
136(kernel, window system, and so on) of the specific operating system
137(if any) on which the executable work runs, or a compiler used to
138produce the work, or an object code interpreter used to run it.
139
140The "Corresponding Source" for a work in object code form means all
141the source code needed to generate, install, and (for an executable
142work) run the object code and to modify the work, including scripts to
143control those activities. However, it does not include the work's
144System Libraries, or general-purpose tools or generally available free
145programs which are used unmodified in performing those activities but
146which are not part of the work. For example, Corresponding Source
147includes interface definition files associated with source files for
148the work, and the source code for shared libraries and dynamically
149linked subprograms that the work is specifically designed to require,
150such as by intimate data communication or control flow between those
151subprograms and other parts of the work.
152
153The Corresponding Source need not include anything that users can
154regenerate automatically from other parts of the Corresponding Source.
155
156The Corresponding Source for a work in source code form is that same
157work.
158
159#### 2. Basic Permissions.
160
161All rights granted under this License are granted for the term of
162copyright on the Program, and are irrevocable provided the stated
163conditions are met. This License explicitly affirms your unlimited
164permission to run the unmodified Program. The output from running a
165covered work is covered by this License only if the output, given its
166content, constitutes a covered work. This License acknowledges your
167rights of fair use or other equivalent, as provided by copyright law.
168
169You may make, run and propagate covered works that you do not convey,
170without conditions so long as your license otherwise remains in force.
171You may convey covered works to others for the sole purpose of having
172them make modifications exclusively for you, or provide you with
173facilities for running those works, provided that you comply with the
174terms of this License in conveying all material for which you do not
175control copyright. Those thus making or running the covered works for
176you must do so exclusively on your behalf, under your direction and
177control, on terms that prohibit them from making any copies of your
178copyrighted material outside their relationship with you.
179
180Conveying under any other circumstances is permitted solely under the
181conditions stated below. Sublicensing is not allowed; section 10 makes
182it unnecessary.
183
184#### 3. Protecting Users' Legal Rights From Anti-Circumvention Law.
185
186No covered work shall be deemed part of an effective technological
187measure under any applicable law fulfilling obligations under article
18811 of the WIPO copyright treaty adopted on 20 December 1996, or
189similar laws prohibiting or restricting circumvention of such
190measures.
191
192When you convey a covered work, you waive any legal power to forbid
193circumvention of technological measures to the extent such
194circumvention is effected by exercising rights under this License with
195respect to the covered work, and you disclaim any intention to limit
196operation or modification of the work as a means of enforcing, against
197the work's users, your or third parties' legal rights to forbid
198circumvention of technological measures.
199
200#### 4. Conveying Verbatim Copies.
201
202You may convey verbatim copies of the Program's source code as you
203receive it, in any medium, provided that you conspicuously and
204appropriately publish on each copy an appropriate copyright notice;
205keep intact all notices stating that this License and any
206non-permissive terms added in accord with section 7 apply to the code;
207keep intact all notices of the absence of any warranty; and give all
208recipients a copy of this License along with the Program.
209
210You may charge any price or no price for each copy that you convey,
211and you may offer support or warranty protection for a fee.
212
213#### 5. Conveying Modified Source Versions.
214
215You may convey a work based on the Program, or the modifications to
216produce it from the Program, in the form of source code under the
217terms of section 4, provided that you also meet all of these
218conditions:
219
220- a) The work must carry prominent notices stating that you modified
221 it, and giving a relevant date.
222- b) The work must carry prominent notices stating that it is
223 released under this License and any conditions added under
224 section 7. This requirement modifies the requirement in section 4
225 to "keep intact all notices".
226- c) You must license the entire work, as a whole, under this
227 License to anyone who comes into possession of a copy. This
228 License will therefore apply, along with any applicable section 7
229 additional terms, to the whole of the work, and all its parts,
230 regardless of how they are packaged. This License gives no
231 permission to license the work in any other way, but it does not
232 invalidate such permission if you have separately received it.
233- d) If the work has interactive user interfaces, each must display
234 Appropriate Legal Notices; however, if the Program has interactive
235 interfaces that do not display Appropriate Legal Notices, your
236 work need not make them do so.
237
238A compilation of a covered work with other separate and independent
239works, which are not by their nature extensions of the covered work,