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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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terms of section 4, provided that you also meet all of these conditions:

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    a) The work must carry prominent notices stating that you modified

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    it, and giving a relevant date.

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    b) The work must carry prominent notices stating that it is

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    released under this License and any conditions added under section

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    7.  This requirement modifies the requirement in section 4 to

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    "keep intact all notices".

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    c) You must license the entire work, as a whole, under this

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    License to anyone who comes into possession of a copy.  This

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    License will therefore apply, along with any applicable section 7

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    additional terms, to the whole of the work, and all its parts,

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    regardless of how they are packaged.  This License gives no

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    permission to license the work in any other way, but it does not

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    invalidate such permission if you have separately received it.

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    d) If the work has interactive user interfaces, each must display

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    Appropriate Legal Notices; however, if the Program has interactive

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    interfaces that do not display Appropriate Legal Notices, your

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    work need not make them do so.

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  A compilation of a covered work with other separate and independent

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works, which are not by their nature extensions of the covered work,

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and which are not combined with it such as to form a larger program,

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in or on a volume of a storage or distribution medium, is called an

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"aggregate" if the compilation and its resulting copyright are not

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used to limit the access or legal rights of the compilation's users

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beyond what the individual works permit.  Inclusion of a covered work

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in an aggregate does not cause this License to apply to the other

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parts of the aggregate.

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  6. Conveying Non-Source Forms.

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  You may convey a covered work in object code form under the terms

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of sections 4 and 5, provided that you also convey the

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machine-readable Corresponding Source under the terms of this License,

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in one of these ways:

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    a) Convey the object code in, or embodied in, a physical product

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    (including a physical distribution medium), accompanied by the

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    Corresponding Source fixed on a durable physical medium

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    customarily used for software interchange.

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    b) Convey the object code in, or embodied in, a physical product

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    (including a physical distribution medium), accompanied by a

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    written offer, valid for at least three years and valid for as

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    long as you offer spare parts or customer support for that product

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    model, to give anyone who possesses the object code either (1) a

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    copy of the Corresponding Source for all the software in the

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    product that is covered by this License, on a durable physical

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    medium customarily used for software interchange, for a price no

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    more than your reasonable cost of physically performing this

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    conveying of source, or (2) access to copy the

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    Corresponding Source from a network server at no charge.

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    c) Convey individual copies of the object code with a copy of the

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    written offer to provide the Corresponding Source.  This

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    alternative is allowed only occasionally and noncommercially, and

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    only if you received the object code with such an offer, in accord

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    with subsection 6b.

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    d) Convey the object code by offering access from a designated

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    place (gratis or for a charge), and offer equivalent access to the

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    Corresponding Source in the same way through the same place at no

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    further charge.  You need not require recipients to copy the

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    Corresponding Source along with the object code.  If the place to

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    copy the object code is a network server, the Corresponding Source

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    may be on a different server (operated by you or a third party)

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    that supports equivalent copying facilities, provided you maintain

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    clear directions next to the object code saying where to find the

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    Corresponding Source.  Regardless of what server hosts the

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    Corresponding Source, you remain obligated to ensure that it is

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    available for as long as needed to satisfy these requirements.

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    e) Convey the object code using peer-to-peer transmission, provided

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    you inform other peers where the object code and Corresponding

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    Source of the work are being offered to the general public at no

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    charge under subsection 6d.

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  A separable portion of the object code, whose source code is excluded

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from the Corresponding Source as a System Library, need not be

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included in conveying the object code work.

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  A "User Product" is either (1) a "consumer product", which means any

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tangible personal property which is normally used for personal, family,

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or household purposes, or (2) anything designed or sold for incorporation

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into a dwelling.  In determining whether a product is a consumer product,

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doubtful cases shall be resolved in favor of coverage.  For a particular

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product received by a particular user, "normally used" refers to a

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typical or common use of that class of product, regardless of the status

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of the particular user or of the way in which the particular user

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actually uses, or expects or is expected to use, the product.  A product

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is a consumer product regardless of whether the product has substantial

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commercial, industrial or non-consumer uses, unless such uses represent

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the only significant mode of use of the product.

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  "Installation Information" for a User Product means any methods,

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procedures, authorization keys, or other information required to install

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and execute modified versions of a covered work in that User Product from

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a modified version of its Corresponding Source.  The information must

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suffice to ensure that the continued functioning of the modified object

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code is in no case prevented or interfered with solely because

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modification has been made.

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  If you convey an object code work under this section in, or with, or

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specifically for use in, a User Product, and the conveying occurs as

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part of a transaction in which the right of possession and use of the

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User Product is transferred to the recipient in perpetuity or for a

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fixed term (regardless of how the transaction is characterized), the

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Corresponding Source conveyed under this section must be accompanied

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by the Installation Information.  But this requirement does not apply

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if neither you nor any third party retains the ability to install

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modified object code on the User Product (for example, the work has

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been installed in ROM).

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  The requirement to provide Installation Information does not include a

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requirement to continue to provide support service, warranty, or updates

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for a work that has been modified or installed by the recipient, or for

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the User Product in which it has been modified or installed.  Access to a

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network may be denied when the modification itself materially and

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adversely affects the operation of the network or violates the rules and

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protocols for communication across the network.

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  Corresponding Source conveyed, and Installation Information provided,

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in accord with this section must be in a format that is publicly

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documented (and with an implementation available to the public in

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source code form), and must require no special password or key for

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unpacking, reading or copying.

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  7. Additional Terms.

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  "Additional permissions" are terms that supplement the terms of this

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License by making exceptions from one or more of its conditions.

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Additional permissions that are applicable to the entire Program shall

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be treated as though they were included in this License, to the extent

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that they are valid under applicable law.  If additional permissions

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apply only to part of the Program, that part may be used separately

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under those permissions, but the entire Program remains governed by

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this License without regard to the additional permissions.

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  When you convey a copy of a covered work, you may at your option

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remove any additional permissions from that copy, or from any part of

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it.  (Additional permissions may be written to require their own

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removal in certain cases when you modify the work.)  You may place

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additional permissions on material, added by you to a covered work,

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for which you have or can give appropriate copyright permission.

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  Notwithstanding any other provision of this License, for material you

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add to a covered work, you may (if authorized by the copyright holders of

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that material) supplement the terms of this License with terms:

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    a) Disclaiming warranty or limiting liability differently from the

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    terms of sections 15 and 16 of this License; or

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    b) Requiring preservation of specified reasonable legal notices or

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    author attributions in that material or in the Appropriate Legal

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    Notices displayed by works containing it; or

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    c) Prohibiting misrepresentation of the origin of that material, or

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    requiring that modified versions of such material be marked in

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    reasonable ways as different from the original version; or

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    d) Limiting the use for publicity purposes of names of licensors or

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    authors of the material; or

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    e) Declining to grant rights under trademark law for use of some

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    trade names, trademarks, or service marks; or

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    f) Requiring indemnification of licensors and authors of that

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    material by anyone who conveys the material (or modified versions of

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    it) with contractual assumptions of liability to the recipient, for

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    any liability that these contractual assumptions directly impose on

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    those licensors and authors.

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  All other non-permissive additional terms are considered "further

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restrictions" within the meaning of section 10.  If the Program as you

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received it, or any part of it, contains a notice stating that it is

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governed by this License along with a term that is a further

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restriction, you may remove that term.  If a license document contains

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a further restriction but permits relicensing or conveying under this

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License, you may add to a covered work material governed by the terms

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of that license document, provided that the further restriction does

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not survive such relicensing or conveying.

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  If you add terms to a covered work in accord with this section, you

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must place, in the relevant source files, a statement of the

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additional terms that apply to those files, or a notice indicating

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where to find the applicable terms.

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  Additional terms, permissive or non-permissive, may be stated in the

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form of a separately written license, or stated as exceptions;

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the above requirements apply either way.

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  8. Termination.

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  You may not propagate or modify a covered work except as expressly

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provided under this License.  Any attempt otherwise to propagate or

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modify it is void, and will automatically terminate your rights under

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this License (including any patent licenses granted under the third

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paragraph of section 11).

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  However, if you cease all violation of this License, then your

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license from a particular copyright holder is reinstated (a)

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provisionally, unless and until the copyright holder explicitly and

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finally terminates your license, and (b) permanently, if the copyright

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holder fails to notify you of the violation by some reasonable means

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prior to 60 days after the cessation.

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  Moreover, your license from a particular copyright holder is

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reinstated permanently if the copyright holder notifies you of the

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violation by some reasonable means, this is the first time you have

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received notice of violation of this License (for any work) from that

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copyright holder, and you cure the violation prior to 30 days after

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your receipt of the notice.

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  Termination of your rights under this section does not terminate the

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licenses of parties who have received copies or rights from you under

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this License.  If your rights have been terminated and not permanently

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reinstated, you do not qualify to receive new licenses for the same

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material under section 10.

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  9. Acceptance Not Required for Having Copies.

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  You are not required to accept this License in order to receive or

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run a copy of the Program.  Ancillary propagation of a covered work

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occurring solely as a consequence of using peer-to-peer transmission

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to receive a copy likewise does not require acceptance.  However,

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nothing other than this License grants you permission to propagate or

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modify any covered work.  These actions infringe copyright if you do

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not accept this License.  Therefore, by modifying or propagating a

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covered work, you indicate your acceptance of this License to do so.

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  10. Automatic Licensing of Downstream Recipients.

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  Each time you convey a covered work, the recipient automatically

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receives a license from the original licensors, to run, modify and

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propagate that work, subject to this License.  You are not responsible

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for enforcing compliance by third parties with this License.

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  An "entity transaction" is a transaction transferring control of an

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organization, or substantially all assets of one, or subdividing an

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organization, or merging organizations.  If propagation of a covered

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work results from an entity transaction, each party to that

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transaction who receives a copy of the work also receives whatever

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licenses to the work the party's predecessor in interest had or could

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give under the previous paragraph, plus a right to possession of the

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Corresponding Source of the work from the predecessor in interest, if

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the predecessor has it or can get it with reasonable efforts.

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  You may not impose any further restrictions on the exercise of the

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rights granted or affirmed under this License.  For example, you may

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not impose a license fee, royalty, or other charge for exercise of

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rights granted under this License, and you may not initiate litigation

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(including a cross-claim or counterclaim in a lawsuit) alleging that

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any patent claim is infringed by making, using, selling, offering for

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sale, or importing the Program or any portion of it.

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  11. Patents.

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  A "contributor" is a copyright holder who authorizes use under this

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License of the Program or a work on which the Program is based.  The

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work thus licensed is called the contributor's "contributor version".

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  A contributor's "essential patent claims" are all patent claims

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owned or controlled by the contributor, whether already acquired or

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hereafter acquired, that would be infringed by some manner, permitted

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by this License, of making, using, or selling its contributor version,

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but do not include claims that would be infringed only as a

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consequence of further modification of the contributor version.  For

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purposes of this definition, "control" includes the right to grant

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patent sublicenses in a manner consistent with the requirements of

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this License.

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  Each contributor grants you a non-exclusive, worldwide, royalty-free

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patent license under the contributor's essential patent claims, to

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make, use, sell, offer for sale, import and otherwise run, modify and

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propagate the contents of its contributor version.

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  In the following three paragraphs, a "patent license" is any express

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agreement or commitment, however denominated, not to enforce a patent

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(such as an express permission to practice a patent or covenant not to

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sue for patent infringement).  To "grant" such a patent license to a

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party means to make such an agreement or commitment not to enforce a

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patent against the party.

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  If you convey a covered work, knowingly relying on a patent license,

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and the Corresponding Source of the work is not available for anyone

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to copy, free of charge and under the terms of this License, through a

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publicly available network server or other readily accessible means,

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then you must either (1) cause the Corresponding Source to be so

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available, or (2) arrange to deprive yourself of the benefit of the

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patent license for this particular work, or (3) arrange, in a manner

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consistent with the requirements of this License, to extend the patent

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license to downstream recipients.  "Knowingly relying" means you have

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