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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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  255 | 
  
        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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  296 | 
  
    
 
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  297 | 
  
      A "User Product" is either (1) a "consumer product", which means any
 
   | 
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  298 | 
  
    tangible personal property which is normally used for personal, family,
 
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  299 | 
  
    or household purposes, or (2) anything designed or sold for incorporation
 
   | 
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  300 | 
  
    into a dwelling.  In determining whether a product is a consumer product,
 
   | 
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  301 | 
  
    doubtful cases shall be resolved in favor of coverage.  For a particular
 
   | 
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  302 | 
  
    product received by a particular user, "normally used" refers to a
 
   | 
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  303 | 
  
    typical or common use of that class of product, regardless of the status
 
   | 
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  304 | 
  
    of the particular user or of the way in which the particular user
 
   | 
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  305 | 
  
    actually uses, or expects or is expected to use, the product.  A product
 
   | 
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  306 | 
  
    is a consumer product regardless of whether the product has substantial
 
   | 
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  307 | 
  
    commercial, industrial or non-consumer uses, unless such uses represent
 
   | 
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  308 | 
  
    the only significant mode of use of the product.
 
   | 
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  309 | 
  
    
 
   | 
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  310 | 
  
      "Installation Information" for a User Product means any methods,
 
   | 
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  311 | 
  
    procedures, authorization keys, or other information required to install
 
   | 
   | 
  312 | 
  
    and execute modified versions of a covered work in that User Product from
 
   | 
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  313 | 
  
    a modified version of its Corresponding Source.  The information must
 
   | 
   | 
  314 | 
  
    suffice to ensure that the continued functioning of the modified object
 
   | 
   | 
  315 | 
  
    code is in no case prevented or interfered with solely because
 
   | 
   | 
  316 | 
  
    modification has been made.
 
   | 
   | 
  317 | 
  
    
 
   | 
   | 
  318 | 
  
      If you convey an object code work under this section in, or with, or
 
   | 
   | 
  319 | 
  
    specifically for use in, a User Product, and the conveying occurs as
 
   | 
   | 
  320 | 
  
    part of a transaction in which the right of possession and use of the
 
   | 
   | 
  321 | 
  
    User Product is transferred to the recipient in perpetuity or for a
 
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  322 | 
  
    fixed term (regardless of how the transaction is characterized), the
 
   | 
   | 
  323 | 
  
    Corresponding Source conveyed under this section must be accompanied
 
   | 
   | 
  324 | 
  
    by the Installation Information.  But this requirement does not apply
 
   | 
   | 
  325 | 
  
    if neither you nor any third party retains the ability to install
 
   | 
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  326 | 
  
    modified object code on the User Product (for example, the work has
 
   | 
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  327 | 
  
    been installed in ROM).
 
   | 
   | 
  328 | 
  
    
 
   | 
   | 
  329 | 
  
      The requirement to provide Installation Information does not include a
 
   | 
   | 
  330 | 
  
    requirement to continue to provide support service, warranty, or updates
 
   | 
   | 
  331 | 
  
    for a work that has been modified or installed by the recipient, or for
 
   | 
   | 
  332 | 
  
    the User Product in which it has been modified or installed.  Access to a
 
   | 
   | 
  333 | 
  
    network may be denied when the modification itself materially and
 
   | 
   | 
  334 | 
  
    adversely affects the operation of the network or violates the rules and
 
   | 
   | 
  335 | 
  
    protocols for communication across the network.
 
   | 
   | 
  336 | 
  
    
 
   | 
   | 
  337 | 
  
      Corresponding Source conveyed, and Installation Information provided,
 
   | 
   | 
  338 | 
  
    in accord with this section must be in a format that is publicly
 
   | 
   | 
  339 | 
  
    documented (and with an implementation available to the public in
 
   | 
   | 
  340 | 
  
    source code form), and must require no special password or key for
 
   | 
   | 
  341 | 
  
    unpacking, reading or copying.
 
   | 
   | 
  342 | 
  
    
 
   | 
   | 
  343 | 
  
      7. Additional Terms.
 
   | 
   | 
  344 | 
  
    
 
   | 
   | 
  345 | 
  
      "Additional permissions" are terms that supplement the terms of this
 
   | 
   | 
  346 | 
  
    License by making exceptions from one or more of its conditions.
 
   | 
   | 
  347 | 
  
    Additional permissions that are applicable to the entire Program shall
 
   | 
   | 
  348 | 
  
    be treated as though they were included in this License, to the extent
 
   | 
   | 
  349 | 
  
    that they are valid under applicable law.  If additional permissions
 
   | 
   | 
  350 | 
  
    apply only to part of the Program, that part may be used separately
 
   | 
   | 
  351 | 
  
    under those permissions, but the entire Program remains governed by
 
   | 
   | 
  352 | 
  
    this License without regard to the additional permissions.
 
   | 
   | 
  353 | 
  
    
 
   | 
   | 
  354 | 
  
      When you convey a copy of a covered work, you may at your option
 
   | 
   | 
  355 | 
  
    remove any additional permissions from that copy, or from any part of
 
   | 
   | 
  356 | 
  
    it.  (Additional permissions may be written to require their own
 
   | 
   | 
  357 | 
  
    removal in certain cases when you modify the work.)  You may place
 
   | 
   | 
  358 | 
  
    additional permissions on material, added by you to a covered work,
 
   | 
   | 
  359 | 
  
    for which you have or can give appropriate copyright permission.
 
   | 
   | 
  360 | 
  
    
 
   | 
   | 
  361 | 
  
      Notwithstanding any other provision of this License, for material you
 
   | 
   | 
  362 | 
  
    add to a covered work, you may (if authorized by the copyright holders of
 
   | 
   | 
  363 | 
  
    that material) supplement the terms of this License with terms:
 
   | 
   | 
  364 | 
  
    
 
   | 
   | 
  365 | 
  
        a) Disclaiming warranty or limiting liability differently from the
 
   | 
   | 
  366 | 
  
        terms of sections 15 and 16 of this License; or
 
   | 
   | 
  367 | 
  
    
 
   | 
   | 
  368 | 
  
        b) Requiring preservation of specified reasonable legal notices or
 
   | 
   | 
  369 | 
  
        author attributions in that material or in the Appropriate Legal
 
   | 
   | 
  370 | 
  
        Notices displayed by works containing it; or
 
   | 
   | 
  371 | 
  
    
 
   | 
   | 
  372 | 
  
        c) Prohibiting misrepresentation of the origin of that material, or
 
   | 
   | 
  373 | 
  
        requiring that modified versions of such material be marked in
 
   | 
   | 
  374 | 
  
        reasonable ways as different from the original version; or
 
   | 
   | 
  375 | 
  
    
 
   | 
   | 
  376 | 
  
        d) Limiting the use for publicity purposes of names of licensors or
 
   | 
   | 
  377 | 
  
        authors of the material; or
 
   | 
   | 
  378 | 
  
    
 
   | 
   | 
  379 | 
  
        e) Declining to grant rights under trademark law for use of some
 
   | 
   | 
  380 | 
  
        trade names, trademarks, or service marks; or
 
   | 
   | 
  381 | 
  
    
 
   | 
   | 
  382 | 
  
        f) Requiring indemnification of licensors and authors of that
 
   | 
   | 
  383 | 
  
        material by anyone who conveys the material (or modified versions of
 
   | 
   | 
  384 | 
  
        it) with contractual assumptions of liability to the recipient, for
 
   | 
   | 
  385 | 
  
        any liability that these contractual assumptions directly impose on
 
   | 
   | 
  386 | 
  
        those licensors and authors.
 
   | 
   | 
  387 | 
  
    
 
   | 
   | 
  388 | 
  
      All other non-permissive additional terms are considered "further
 
   | 
   | 
  389 | 
  
    restrictions" within the meaning of section 10.  If the Program as you
 
   | 
   | 
  390 | 
  
    received it, or any part of it, contains a notice stating that it is
 
   | 
   | 
  391 | 
  
    governed by this License along with a term that is a further
 
   | 
   | 
  392 | 
  
    restriction, you may remove that term.  If a license document contains
 
   | 
   | 
  393 | 
  
    a further restriction but permits relicensing or conveying under this
 
   | 
   | 
  394 | 
  
    License, you may add to a covered work material governed by the terms
 
   | 
   | 
  395 | 
  
    of that license document, provided that the further restriction does
 
   | 
   | 
  396 | 
  
    not survive such relicensing or conveying.
 
   | 
   | 
  397 | 
  
    
 
   | 
   | 
  398 | 
  
      If you add terms to a covered work in accord with this section, you
 
   | 
   | 
  399 | 
  
    must place, in the relevant source files, a statement of the
 
   | 
   | 
  400 | 
  
    additional terms that apply to those files, or a notice indicating
 
   | 
   | 
  401 | 
  
    where to find the applicable terms.
 
   | 
   | 
  402 | 
  
    
 
   | 
   | 
  403 | 
  
      Additional terms, permissive or non-permissive, may be stated in the
 
   | 
   | 
  404 | 
  
    form of a separately written license, or stated as exceptions;
 
   | 
   | 
  405 | 
  
    the above requirements apply either way.
 
   | 
   | 
  406 | 
  
    
 
   | 
   | 
  407 | 
  
      8. Termination.
 
   | 
   | 
  408 | 
  
    
 
   | 
   | 
  409 | 
  
      You may not propagate or modify a covered work except as expressly
 
   | 
   | 
  410 | 
  
    provided under this License.  Any attempt otherwise to propagate or
 
   | 
   | 
  411 | 
  
    modify it is void, and will automatically terminate your rights under
 
   | 
   | 
  412 | 
  
    this License (including any patent licenses granted under the third
 
   | 
   | 
  413 | 
  
    paragraph of section 11).
 
   | 
   | 
  414 | 
  
    
 
   | 
   | 
  415 | 
  
      However, if you cease all violation of this License, then your
 
   | 
   | 
  416 | 
  
    license from a particular copyright holder is reinstated (a)
 
   | 
   | 
  417 | 
  
    provisionally, unless and until the copyright holder explicitly and
 
   | 
   | 
  418 | 
  
    finally terminates your license, and (b) permanently, if the copyright
 
   | 
   | 
  419 | 
  
    holder fails to notify you of the violation by some reasonable means
 
   | 
   | 
  420 | 
  
    prior to 60 days after the cessation.
 
   | 
   | 
  421 | 
  
    
 
   | 
   | 
  422 | 
  
      Moreover, your license from a particular copyright holder is
 
   | 
   | 
  423 | 
  
    reinstated permanently if the copyright holder notifies you of the
 
   |