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GNU GENERAL PUBLIC LICENSE
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Version 3, 29 June 2007
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Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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Everyone is permitted to copy and distribute verbatim copies
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of this license document, but changing it is not allowed.
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Preamble
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The GNU General Public License is a free, copyleft license for
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software and other kinds of works.
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The licenses for most software and other practical works are designed
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to take away your freedom to share and change the works. By contrast,
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the GNU General Public License is intended to guarantee your freedom to
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share and change all versions of a program--to make sure it remains free
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software for all its users. We, the Free Software Foundation, use the
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GNU General Public License for most of our software; it applies also to
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any other work released this way by its authors. You can apply it to
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your programs, too.
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When we speak of free software, we are referring to freedom, not
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price. Our General Public Licenses are designed to make sure that you
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have the freedom to distribute copies of free software (and charge for
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them if you wish), that you receive source code or can get it if you
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want it, that you can change the software or use pieces of it in new
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free programs, and that you know you can do these things.
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To protect your rights, we need to prevent others from denying you
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these rights or asking you to surrender the rights. Therefore, you have
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certain responsibilities if you distribute copies of the software, or if
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you modify it: responsibilities to respect the freedom of others.
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For example, if you distribute copies of such a program, whether
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gratis or for a fee, you must pass on to the recipients the same
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freedoms that you received. You must make sure that they, too, receive
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or can get the source code. And you must show them these terms so they
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know their rights.
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Developers that use the GNU GPL protect your rights with two steps:
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(1) assert copyright on the software, and (2) offer you this License
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giving you legal permission to copy, distribute and/or modify it.
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For the developers' and authors' protection, the GPL clearly explains
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that there is no warranty for this free software. For both users' and
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authors' sake, the GPL requires that modified versions be marked as
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changed, so that their problems will not be attributed erroneously to
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authors of previous versions.
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Some devices are designed to deny users access to install or run
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modified versions of the software inside them, although the manufacturer
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can do so. This is fundamentally incompatible with the aim of
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protecting users' freedom to change the software. The systematic
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pattern of such abuse occurs in the area of products for individuals to
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use, which is precisely where it is most unacceptable. Therefore, we
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have designed this version of the GPL to prohibit the practice for those
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products. If such problems arise substantially in other domains, we
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stand ready to extend this provision to those domains in future versions
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of the GPL, as needed to protect the freedom of users.
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Finally, every program is threatened constantly by software patents.
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States should not allow patents to restrict development and use of
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software on general-purpose computers, but in those that do, we wish to
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avoid the special danger that patents applied to a free program could
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make it effectively proprietary. To prevent this, the GPL assures that
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patents cannot be used to render the program non-free.
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The precise terms and conditions for copying, distribution and
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modification follow.
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TERMS AND CONDITIONS
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0. Definitions.
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"This License" refers to version 3 of the GNU General Public License.
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"Copyright" also means copyright-like laws that apply to other kinds of
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works, such as semiconductor masks.
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"The Program" refers to any copyrightable work licensed under this
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License. Each licensee is addressed as "you". "Licensees" and
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"recipients" may be individuals or organizations.
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To "modify" a work means to copy from or adapt all or part of the work
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in a fashion requiring copyright permission, other than the making of an
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exact copy. The resulting work is called a "modified version" of the
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earlier work or a work "based on" the earlier work.
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A "covered work" means either the unmodified Program or a work based
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on the Program.
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To "propagate" a work means to do anything with it that, without
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permission, would make you directly or secondarily liable for
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infringement under applicable copyright law, except executing it on a
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computer or modifying a private copy. Propagation includes copying,
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distribution (with or without modification), making available to the
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public, and in some countries other activities as well.
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To "convey" a work means any kind of propagation that enables other
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parties to make or receive copies. Mere interaction with a user through
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a computer network, with no transfer of a copy, is not conveying.
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An interactive user interface displays "Appropriate Legal Notices"
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to the extent that it includes a convenient and prominently visible
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feature that (1) displays an appropriate copyright notice, and (2)
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tells the user that there is no warranty for the work (except to the
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extent that warranties are provided), that licensees may convey the
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work under this License, and how to view a copy of this License. If
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the interface presents a list of user commands or options, such as a
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menu, a prominent item in the list meets this criterion.
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1. Source Code.
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The "source code" for a work means the preferred form of the work
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for making modifications to it. "Object code" means any non-source
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form of a work.
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A "Standard Interface" means an interface that either is an official
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standard defined by a recognized standards body, or, in the case of
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interfaces specified for a particular programming language, one that
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is widely used among developers working in that language.
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The "System Libraries" of an executable work include anything, other
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than the work as a whole, that (a) is included in the normal form of
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packaging a Major Component, but which is not part of that Major
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Component, and (b) serves only to enable use of the work with that
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Major Component, or to implement a Standard Interface for which an
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implementation is available to the public in source code form. A
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"Major Component", in this context, means a major essential component
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(kernel, window system, and so on) of the specific operating system
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(if any) on which the executable work runs, or a compiler used to
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produce the work, or an object code interpreter used to run it.
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The "Corresponding Source" for a work in object code form means all
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the source code needed to generate, install, and (for an executable
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work) run the object code and to modify the work, including scripts to
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control those activities. However, it does not include the work's
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System Libraries, or general-purpose tools or generally available free
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programs which are used unmodified in performing those activities but
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which are not part of the work. For example, Corresponding Source
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includes interface definition files associated with source files for
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the work, and the source code for shared libraries and dynamically
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linked subprograms that the work is specifically designed to require,
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such as by intimate data communication or control flow between those
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subprograms and other parts of the work.
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The Corresponding Source need not include anything that users
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can regenerate automatically from other parts of the Corresponding
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Source.
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The Corresponding Source for a work in source code form is that
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same work.
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2. Basic Permissions.
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All rights granted under this License are granted for the term of
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copyright on the Program, and are irrevocable provided the stated
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conditions are met. This License explicitly affirms your unlimited
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permission to run the unmodified Program. The output from running a
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covered work is covered by this License only if the output, given its
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content, constitutes a covered work. This License acknowledges your
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rights of fair use or other equivalent, as provided by copyright law.
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You may make, run and propagate covered works that you do not
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convey, without conditions so long as your license otherwise remains
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in force. You may convey covered works to others for the sole purpose
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of having them make modifications exclusively for you, or provide you
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with facilities for running those works, provided that you comply with
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the terms of this License in conveying all material for which you do
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not control copyright. Those thus making or running the covered works
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for you must do so exclusively on your behalf, under your direction
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and control, on terms that prohibit them from making any copies of
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your copyrighted material outside their relationship with you.
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Conveying under any other circumstances is permitted solely under
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the conditions stated below. Sublicensing is not allowed; section 10
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makes it unnecessary.
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3. Protecting Users' Legal Rights From Anti-Circumvention Law.
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No covered work shall be deemed part of an effective technological
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measure under any applicable law fulfilling obligations under article
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11 of the WIPO copyright treaty adopted on 20 December 1996, or
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similar laws prohibiting or restricting circumvention of such
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measures.
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When you convey a covered work, you waive any legal power to forbid
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circumvention of technological measures to the extent such circumvention
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is effected by exercising rights under this License with respect to
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the covered work, and you disclaim any intention to limit operation or
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modification of the work as a means of enforcing, against the work's
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users, your or third parties' legal rights to forbid circumvention of
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technological measures.
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4. Conveying Verbatim Copies.
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You may convey verbatim copies of the Program's source code as you
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receive it, in any medium, provided that you conspicuously and
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appropriately publish on each copy an appropriate copyright notice;
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keep intact all notices stating that this License and any
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non-permissive terms added in accord with section 7 apply to the code;
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keep intact all notices of the absence of any warranty; and give all
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recipients a copy of this License along with the Program.
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You may charge any price or no price for each copy that you convey,
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and you may offer support or warranty protection for a fee.
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5. Conveying Modified Source Versions.
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You may convey a work based on the Program, or the modifications to
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produce it from the Program, in the form of source code under the
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