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<appendix id="appendix-gpl"><title>GNU General Public License</title>
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Copyright (C) 1989, 1991 Free Software Foundation, Inc.
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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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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<sect1><title>Preamble</title>
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The licenses for most software are designed to take away your freedom
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to share and change it. By contrast, the gnu General Public License
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is intended to guarantee your freedom to share and change free
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software — to make sure the software is free for all its users. This
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General Public License applies to most of the Free Software
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Foundation's software and to any other program whose authors commit
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to using it. (Some other Free Software Foundation software is covered
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by the gnu Library General Public License instead.) You can apply it
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to 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
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for this service if you wish), that you receive source code or can
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get it if you want it, that you can change the software or use pieces
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of it in new free programs; and that you know you can do these
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To protect your rights, we need to make restrictions that forbid
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anyone to deny you these rights or to ask you to surrender the
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rights. These restrictions translate to certain responsibilities for
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you if you distribute copies of the software, or if you modify it.
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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 give the recipients all the rights that
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you have. You must make sure that they, too, receive or can get the
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source code. And you must show them these terms so they know their
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We protect your rights with two steps: (1) copyright the software,
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and (2) offer you this license which gives you legal permission to
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copy, distribute and/or modify the software.
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Also, for each author's protection and ours, we want to make certain
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that everyone understands that there is no warranty for this free
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software. If the software is modified by someone else and passed on,
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we want its recipients to know that what they have is not the
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original, so that any problems introduced by others will not reflect
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on the original authors' reputations.
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Finally, any free program is threatened constantly by software
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patents. We wish to avoid the danger that redistributors of a free
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program will individually obtain patent licenses, in effect making
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the program proprietary. To prevent this, we have made it clear that
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any patent must be licensed for everyone's free use or not licensed
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The precise terms and conditions for copying, distribution and
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<sect1><title>GNU GENERAL PUBLIC LICENSE</title>
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TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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<itemizedlist><listitem><para>
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This License applies to any program or other work which contains a
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notice placed by the copyright holder saying it may be distributed
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under the terms of this General Public License. The "Program", below,
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refers to any such program or work, and a "work based on the Program"
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means either the Program or any derivative work under copyright law:
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that is to say, a work containing the Program or a portion of it,
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either verbatim or with modifications and/or translated into another
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language. (Hereinafter, translation is included without limitation in
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the term "modification".) Each licensee is addressed as "you".
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Activities other than copying, distribution and modification are not
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covered by this License; they are outside its scope. The act of
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running the Program is not restricted, and the output from the
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Program is covered only if its contents constitute a work based on
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the Program (independent of having been made by running the Program).
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Whether that is true depends on what the Program does.
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You may copy and distribute verbatim copies of the Program's
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source code as you receive it, in any medium, provided that you
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conspicuously and appropriately publish on each copy an appropriate
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copyright notice and disclaimer of warranty; keep intact all the
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notices that refer to this License and to the absence of any
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warranty; and give any other recipients of the Program a copy of this
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License along with the Program.
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You may charge a fee for the physical act of transferring a copy, and
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you may at your option offer warranty protection in exchange for a
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You may modify your copy or copies of the Program or any portion
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of it, thus forming a work based on the Program, and copy and
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distribute such modifications or work under the terms of Section 1
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above, provided that you also meet all of these conditions:
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a) You must cause the modified files to carry prominent notices
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stating that you changed the files and the date of any change.
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b) You must cause any work that you distribute or publish, that in
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whole or in part contains or is derived from the Program or any part
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thereof, to be licensed as a whole at no charge to all third parties
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under the terms of this License.
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c) If the modified program normally reads commands interactively when
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run, you must cause it, when started running for such interactive use
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in the most ordinary way, to print or display an announcement
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including an appropriate copyright notice and a notice that there is
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no warranty (or else, saying that you provide a warranty) and that
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users may redistribute the program under these conditions, and
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telling the user how to view a copy of this License. (Exception: if
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the Program itself is interactive but does not normally print such an
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announcement, your work based on the Program is not required to print
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These requirements apply to the modified work as a whole. If
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identifiable sections of that work are not derived from the Program,
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and can be reasonably considered independent and separate works in
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themselves, then this License, and its terms, do not apply to those
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sections when you distribute them as separate works. But when you
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distribute the same sections as part of a whole which is a work based
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on the Program, the distribution of the whole must be on the terms of
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this License, whose permissions for other licensees extend to the
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entire whole, and thus to each and every part regardless of who wrote
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Thus, it is not the intent of this section to claim rights or contest
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your rights to work written entirely by you; rather, the intent is to
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exercise the right to control the distribution of derivative or
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collective works based on the Program.
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In addition, mere aggregation of another work not based on the
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Program with the Program (or with a work based on the Program) on a
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volume of a storage or distribution medium does not bring the other
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work under the scope of this License.
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You may copy and distribute the Program (or a work based on it,
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under Section 2) in object code or executable form under the terms of
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Sections 1 and 2 above provided that you also do one of the
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a) Accompany it with the complete corresponding machine-readable
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source code, which must be distributed under the terms of Sections 1
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and 2 above on a medium customarily used for software interchange;
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b) Accompany it with a written offer, valid for at least three years,
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to give any third party, for a charge no more than your cost of
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physically performing source distribution, a complete
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machine-readable copy of the corresponding source code, to be
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distributed under the terms of Sections 1 and 2 above on a medium
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customarily used for software interchange; or,
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c) Accompany it with the information you received as to the offer to
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distribute corresponding source code. (This alternative is allowed
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only for noncommercial distribution and only if you received the
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program in object code or executable form with such an offer, in
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accord with Subsection b above.)
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The source code for a work means the preferred form of the work for
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making modifications to it. For an executable work, complete source
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code means all the source code for all modules it contains, plus any
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associated interface definition files, plus the scripts used to
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control compilation and installation of the executable. However, as a
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special exception, the source code distributed need not include
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anything that is normally distributed (in either source or binary
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form) with the major components (compiler, kernel, and so on) of the
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operating system on which the executable runs, unless that component
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itself accompanies the executable.
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If distribution of executable or object code is made by offering
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access to copy from a designated place, then offering equivalent
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access to copy the source code from the same place counts as
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distribution of the source code, even though third parties are not
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compelled to copy the source along with the object code.
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You may not copy, modify, sublicense, or distribute the Program
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except as expressly provided under this License. Any attempt
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otherwise to copy, modify, sublicense or distribute the Program is
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void, and will automatically terminate your rights under this
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License. However, parties who have received copies, or rights, from
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you under this License will not have their licenses terminated so
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long as such parties remain in full compliance.
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You are not required to accept this License, since you have not
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signed it. However, nothing else grants you permission to modify or
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distribute the Program or its derivative works. These actions are
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prohibited by law if you do not accept this License. Therefore, by
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modifying or distributing the Program (or any work based on the
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Program), you indicate your acceptance of this License to do so, and
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all its terms and conditions for copying, distributing or modifying
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the Program or works based on it.
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Each time you redistribute the Program (or any work based on the
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Program), the recipient automatically receives a license from the
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original licensor to copy, distribute or modify the Program subject
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to these terms and conditions. You may not impose any further
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restrictions on the recipients' exercise of the rights granted
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herein. You are not responsible for enforcing compliance by third
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parties to this License.
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If, as a consequence of a court judgment or allegation of patent
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infringement or for any other reason (not limited to patent issues),
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conditions are imposed on you (whether by court order, agreement or
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otherwise) that contradict the conditions of this License, they do
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not excuse you from the conditions of this License. If you cannot
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distribute so as to satisfy simultaneously your obligations under
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this License and any other pertinent obligations, then as a
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consequence you may not distribute the Program at all. For example,
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if a patent license would not permit royalty-free redistribution of
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the Program by all those who receive copies directly or indirectly
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through you, then the only way you could satisfy both it and this
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License would be to refrain entirely from distribution of the
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If any portion of this section is held invalid or unenforceable under
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any particular circumstance, the balance of the section is intended
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to apply and the section as a whole is intended to apply in other
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It is not the purpose of this section to induce you to infringe any
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patents or other property right claims or to contest validity of any
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such claims; this section has the sole purpose of protecting the
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integrity of the free software distribution system, which is
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implemented by public license practices. Many people have made
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generous contributions to the wide range of software distributed
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through that system in reliance on consistent application of that
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system; it is up to the author/donor to decide if he or she is
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willing to distribute software through any other system and a
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licensee cannot impose that choice.
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This section is intended to make thoroughly clear what is believed to
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be a consequence of the rest of this License.
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If the distribution and/or use of the Program is restricted in
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certain countries either by patents or by copyrighted interfaces, the
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original copyright holder who places the Program under this License
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may add an explicit geographical distribution limitation excluding
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those countries, so that distribution is permitted only in or among
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countries not thus excluded. In such case, this License incorporates
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the limitation as if written in the body of this License.
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The Free Software Foundation may publish revised and/or new
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versions of the General Public License from time to time. Such new
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versions will be similar in spirit to the present version, but may
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differ in detail to address new problems or concerns. Each version is
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given a distinguishing version number. If the Program specifies a
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version number of this License which applies to it and "any later
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version", you have the option of following the terms and conditions
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either of that version or of any later version published by the Free
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Software Foundation. If the Program does not specify a version number
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of this License, you may choose any version ever published by the
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Free Software Foundation.
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If you wish to incorporate parts of the Program into other free
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programs whose distribution conditions are different, write to the
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author to ask for permission. For software which is copyrighted by
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the Free Software Foundation, write to the Free Software Foundation;
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we sometimes make exceptions for this. Our decision will be guided by
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the two goals of preserving the free status of all derivatives of our
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free software and of promoting the sharing and reuse of software
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because the program is licensed free of charge, there is no
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warranty for the program, to the extent permitted by applicable law.
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except when otherwise stated in writing the copyright holders and/or
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other parties provide the program "as is" without warranty of any
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kind, either expressed or implied, including, but not limited to, the
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implied warranties of merchantability and fitness for a particular
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purpose. the entire risk as to the quality and performance of the
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program is with you. should the program prove defective, you assume
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the cost of all necessary servicing, repair or correction.
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in no event unless required by applicable law or agreed to in
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writing will any copyright holder, or any other party who may modify
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and/or redistribute the program as permitted above, be liable to you
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for damages, including any general, special, incidental or
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consequential damages arising out of the use or inability to use the
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program (including but not limited to loss of data or data being
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rendered inaccurate or losses sustained by you or third parties or a
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failure of the program to operate with any other programs), even if
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such holder or other party has been advised of the possibility of
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END OF TERMS AND CONDITIONS
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<sect1><title>How to Apply These Terms to Your New Programs</title>
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If you develop a new program, and you want it to be of the greatest
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possible use to the public, the best way to achieve this is to make
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it free software which everyone can redistribute and change under
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To do so, attach the following notices to the program. It is safest
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to attach them to the start of each source file to most effectively
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convey the exclusion of warranty; and each file should have at least
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the "copyright" line and a pointer to where the full notice is found.
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one line to give the program's name and a brief idea of what it
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Copyright (C) year name of author
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This program is free software; you can redistribute it and/or modify
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it under the terms of the gnu General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but
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without any warranty; without even the implied warranty of
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merchantability or fitness for a particular purpose. See the gnu
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General Public License for more details.
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You should have received a copy of the gnu General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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Also add information on how to contact you by electronic and paper
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If the program is interactive, make it output a short notice like
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this when it starts in an interactive mode:
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Gnomovision version 69, Copyright (C) year name of author
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Gnomovision comes with absolutely no warranty; for details type `show
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This is free software, and you are welcome to redistribute it under
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certain conditions; type `show c' for details.
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The hypothetical commands `show w' and `show c' should show the
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appropriate parts of the General Public License. Of course, the
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commands you use may be called something other than `show w' and
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`show c'; they could even be mouse-clicks or menu items — whatever
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You should also get your employer (if you work as a programmer) or
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your school, if any, to sign a "copyright disclaimer" for the
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program, if necessary. Here is a sample; alter the names:
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Yoyodyne, Inc., hereby disclaims all copyright interest in the
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program `Gnomovision' (which makes passes at compilers) written by
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signature of Ty Coon, 1 April 1989
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Ty Coon, President of Vice
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This General Public License does not permit incorporating your
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program into proprietary programs. If your program is a subroutine
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library, you may consider it more useful to permit linking
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proprietary applications with the library. If this is what you want
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to do, use the gnu Library General Public License instead of this