LICENSE

                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

                            Preamble

  The GNU General Public License is a free, copyleft license for
  software and other kinds of works.

  The licenses for most software and other practical works are designed
  to take away your freedom to share and change the works. By contrast,
  the GNU General Public License is intended to guarantee your freedom
  to share and change all versions of a program--to make sure it remains
  free software for all its users. We, the Free Software Foundation, use
  the GNU General Public License for most of our software; it applies
  also to any other work released this way by its authors. You can use
  it for your programs, too.

  When we speak of free software, we are referring to freedom, not
  price. Our General Public Licenses are designed to make sure that you
  have the freedom to distribute copies of free software (and charge for
  them if you wish), that you receive source code or can get it if you
  want it, that you can change the software or use pieces of it in new
  free programs, and that you know you can do these things.

  To protect your rights, we need to prevent others from denying you
  these rights or asking you to surrender the rights. Therefore, you have
  certain responsibilities if you distribute copies of the software, or
  if you modify it: responsibilities to respect the freedom of others.

  For example, if you distribute copies of such a program, whether gratis
  or for a fee, you must pass on to the recipients the same freedoms that
  you received. You must make sure that they, too, receive or can get
  the source code. And you must show them these terms so they know their
  rights.

  Developers that use the GNU GPL protect your rights with two steps:
  (1) assert copyright on the software, and (2) offer you this License
  giving you legal permission to copy, distribute and/or modify it.

  For the developers' and authors' protection, the GPL clearly explains
  that there is no warranty for this free software. For both users' and
  authors' sake, the GPL requires that modified versions be marked as
  changed, so that their problems will not be attributed erroneously to
  authors of previous versions.

  Some devices are designed to deny users access to install or run
  modified versions of the software inside them, although the
  manufacturer can do so. This is fundamentally incompatible with the
  aim of protecting users' freedom to change the software. The systemic
  pattern of such abuse occurs in the area of products for individuals
  to use, which is precisely where it is most unacceptable. Therefore,
  we have designed this version of the GPL to prohibit that practice for
  those products. If such problems arise substantially in other domains,
  we stand ready to extend this provision to those domains in future
  versions of the GPL, as needed.

  Finally, every program is threatened constantly by software patents.
  States should not allow patents to restrict development and use of
  software on general-purpose computers, but in those that do, we wish
  to avoid the special danger that patents applied to a free program
  could make it effectively proprietary. To prevent this, the GPL
  ensures that patents cannot be used to render the program non-free.

  The precise terms and conditions for copying, distribution and
  modification follow.

                       TERMS AND CONDITIONS

  0. Definitions.

  "This License" refers to version 3 of the GNU General Public License.

  "Copyright" also means copyright-like laws that apply to other kinds of
  works, such as semiconductor masks.

  "The Program" refers to any copyrightable work licensed under this
  License. Each licensee is addressed as "you". "Licensees" and
  "recipients" may be individuals or organizations.

  To "modify" a work means to copy from or adapt all or part of the work
  in a fashion requiring copyright permission, other than the making of
  an exact copy. The resulting work is called a "modified version" of
  the earlier work or a work "based on" the earlier work.

  A "covered work" means either the unmodified Program or a work based
  on the Program.

  To "propagate" a work means to do anything with it that, without
  permission, would make you directly or secondarily liable for
  infringement under applicable copyright law, except executing it on a
  computer or modifying a private copy. Propagation includes copying,
  distribution (with or without modification), making available to the
  public, and in some countries other activities as well.

  To "convey" a work means any type of propagation that enables other
  parties to make or receive copies. Mere interaction with a user
  through a computer network, with no transfer of a copy, is not
  conveying.

  An interactive user interface displays "Appropriate Legal Notices"
  to the extent that it includes a convenient and prominently visible
  feature that (1) displays an appropriate copyright notice, and (2)
  tells the user that there is no warranty for the work (except to the
  extent that warranties are provided), that licensees may convey the
  work under this License, and how to view a copy of this License. If
  the interface presents a list of user commands or options, such as a
  menu, a prominent item in the list meets this criterion.

  1. Source Code.

  The "source code" for a work means the preferred form of the work for
  making modifications to it. "Object code" means any non-source form
  of a work.

  A "Standard Interface" means an interface that either is an official
  standard defined by a recognized standards body, or, in the case of
  interfaces specified for a particular programming language, one that
  is widely used among developers working in that language.

  The "System Libraries" of an executable work include anything, other
  than the work as a whole, that (a) is included in the normal form of
  packaging a Major Component, but which is not part of that Major
  Component, and (b) serves only to enable use of the work with that
  Major Component, or to implement a Standard Interface for which an
  implementation is available to the public in source code form. A
  "Major Component", in this context, means a major essential component
  (kernel, window system, and so on) of the specific operating system
  (if any) on which the executable work runs, or a compiler used to
  produce the work, or an object code interpreter used to run it.

  The "Corresponding Source" for a work in object code form means all
  the source code needed to generate, install, and run the object code
  and to modify the work, including scripts to control those activities.
  However, it does not include the work's System Libraries, or general-
  purpose tools or generally available free programs which are used
  unmodified in performing those activities but which are not part of
  the work. For example, Corresponding Source includes interface
  definition files associated with source files, and the source code for
  shared libraries and dynamically linked subprograms that the work is
  specifically designed to require, such as by intimate data
  communication or control flow between those subprograms and other
  parts of the work.

  The Corresponding Source need not include anything that users can
  regenerate automatically from other parts of the Corresponding Source.

  The Corresponding Source for a work in source code form is that same
  work.

  2. Basic Permissions.

  All rights granted under this License are granted for the term of
  copyright on the Program, and are irrevocable provided the stated
  conditions are met. This License explicitly affirms your unlimited
  permission to run the unmodified Program. The output from running a
  covered work is covered by this License only if the output, given its
  content, constitutes a covered work. This License acknowledges your
  rights of fair use or other equivalent, as provided by copyright law.

  You may make, run and propagate covered works that you do not convey,
  without condition so long as your license otherwise remains in force.
  You may convey covered works to others for the sole purpose of having
  them make modifications exclusively for you, or provide you with
  facilities for running those works, provided that you comply with the
  terms of this License in conveying all material for which you do not
  control copyright. Those thus making or running the covered works for
  you must do so exclusively on your behalf, under your direction and
  control, on terms that prohibit them from making any copies of your
  copyrighted material outside their relationship with you.

  3. Protecting Users' Legal Rights From Anti-Circumvention Law.

  No covered work shall be deemed part of an effective technological
  measure under any applicable law fulfilling obligations under article
  11 of the WIPO copyright treaty adopted on 20 December 1996, or
  similar laws prohibiting or restricting circumvention of such
  measures.

  When you convey a covered work, you waive any legal power to forbid
  circumvention of technological measures to the extent such circumvention
  is effected by exercising rights under this License with respect to
  the covered work, and you disclaim any intention to limit operation or
  modification of the work as a means of enforcing, against the work's
  users, your or third parties' legal rights to prohibit circumvention
  of technological measures.

  4. Conveying Verbatim Copies.

  You may convey verbatim copies of the Program's source code as you
  receive it, in any medium, provided that you conspicuously and
  appropriately publish on each copy an appropriate copyright notice;
  keep intact all notices stating that this License and any non-permissive
  terms added in accord with section 7 apply to the code; keep intact
  all notices of the absence of any warranty; and give all recipients
  a copy of this License along with the Program.

  You may charge any price or no price for each copy that you convey,
  and you may offer support or warranty protection for a fee.

  5. Conveying Modified Source Versions.

  You may convey a work based on the Program, or the modifications to
  produce it from the Program, in the form of source code under the
  terms of section 4, provided that you also meet all of these conditions:

    a) The work must carry prominent notices stating that you modified
    it, and giving a relevant date.

    b) The work must carry prominent notices stating that it is
    released under this License and any conditions added under section
    7. This requirement modifies the requirement in section 4 to
    "keep intact all notices".

    c) You must license the entire work, as a whole, under this
    License to anyone who comes into possession of a copy. This
    License will therefore apply, along with any applicable section 7
    additional terms, to the whole of the work, and all its parts,
    regardless of how they are packaged. This License gives no
    permission to license the work in any other way, but it does not
    invalidate such permission if you have separately received it.

    d) If the work has interactive user interfaces, each must display
    Appropriate Legal Notices; however, if the Program has interactive
    interfaces that do not display Appropriate Legal Notices, your
    work need not make them do so.

  A compilation of a covered work with other separate and independent
  works, which are not by their nature extensions of the covered work,
  and which are not combined with it such as to form a larger program,
  in or on a volume of a storage or distribution medium, is called an
  "aggregate" if the compilation and its resulting copyright are not used
  to limit the access or legal rights of the compilation's users beyond
  what the individual works permit. Inclusion of a covered work in an
  aggregate does not cause this License to apply to the other parts of
  the aggregate.

  6. Conveying Non-Source Forms.

  You may convey a covered work in object code form under the terms
  of sections 4 and 5, provided that you also convey the machine-readable
  Corresponding Source under the terms of this License, in one of these
  ways:

    a) Convey the object code in, or embodied in, a physical product
    (including a physical distribution medium), accompanied by the
    Corresponding Source fixed on a durable physical medium customarily
    used for software interchange.

    b) Convey the object code in, or embodied in, a physical product
    (including a physical distribution medium), accompanied by a written
    offer, valid for at least three years and valid for as long as you
    offer spare parts or customer support for that product model, to give
    anyone who possesses the object code either (1) a copy of the
    Corresponding Source for all the software in the product that is
    covered by this License, on a durable physical medium customarily
    used for software interchange, for a price no more than your
    reasonable cost of physically performing this conveying of source,
    or (2) access to copy the Corresponding Source from a network
    server at no charge.

    c) Convey individual copies of the object code with a copy of the
    written offer to provide the Corresponding Source. This alternative
    is allowed only occasionally and noncommercially, and only if you
    received the object code with such an offer, in accord with subsection
    6b.

    d) Convey the object code by offering access from a designated place
    (gratis or for a charge), and offer equivalent access to the
    Corresponding Source in the same way through the same place at no
    charge. You need not require recipients to copy the Corresponding
    Source along with the object code. If the place to copy the object
    code is a network server, the Corresponding Source may be on a
    different server but must afford equivalent copying facilities,
    provided you maintain the object code and Corresponding Source at
    the same place for as long as you offer to provide access to the
    object code.

    e) Convey the object code using peer-to-peer transmission, provided
    you inform other peers where the object code and Corresponding Source
    of the work are being offered to the general public at no charge
    under subsection 6d.

  A separable portion of the object code, whose source code is excluded
  from the Corresponding Source as a System Library, need not be
  included in conveying the object code work.

  A "User Product" is either (1) a "consumer product", which means any
  tangible personal property which is normally used for personal, family,
  or household purposes, or (2) anything designed or sold for
  incorporation into a dwelling. In determining whether a product is a
  consumer product, doubtful cases shall be resolved in favor of coverage.
  For a particular product received by a particular user, "normally used"
  refers to a typical or common use of that class of product, regardless
  of the status of the particular user or of the way in which the
  particular user actually uses, or expects or is expected to use, the
  product. A product is a consumer product if it has substantial user
  functionality in electrical, electronic or software form.

  "Installation Information" for a User Product means any methods,
  procedures, authorization keys, or other information required to
  install and execute modified versions of a covered work in that User
  Product from a modified version of its Corresponding Source. The
  information must suffice to ensure that the continued functioning of
  the modified object code is in no case prevented or interfered with
  solely because modification has been made.

  If you convey an object code work under this section in, or with, or
  specifically for use in a User Product, and the conveying occurs as
  part of a transaction in which the right of possession and use of the
  User Product is transferred to the recipient in perpetuity or for a
  fixed term (regardless of how the transaction is characterized), the
  Corresponding Source conveyed under this section must be accompanied
  by the Installation Information. But this requirement does not apply
  if neither you nor any third party retains the ability to install
  modified object code on the User Product (for example, the work has
  been installed in ROM).

  The requirement to provide Installation Information does not include a
  requirement to continue to provide network services, support, or update
  facilities for a work that has been modified or installed by the
  recipient. However, if a network server substantially modifies the
  Program during use, the Program's modified source code must be made
  available by the server.

  7. Additional Terms.

  "Additional permissions" are terms that supplement the terms of this
  License by making exceptions from one or more of its conditions.
  "Reduced copyleft alternatives" are terms that permit "lesser"
  copylefting or other forms of permitting use of copyrighted works
  under conditions less stringent than those of this License.

  At your option, you may attach additional terms to a covered work
  that you convey, provided that, where applicable, the additional terms
  do not contradict the requirements of this License. If this License
  requires you to remove a term that qualifies as an additional
  permission, you may do so. An authorized distributor of a covered
  work may also choose to remove additional permissions from that work
  at will.

  If you add terms to a covered work, in a transaction in which you
  transfer copyright or exclusive rights in the work to another party
  (or several parties), you may specify that all or any of those
  additional terms may be subsequently removed by that party (or that
  parties). This License grants no additional permissions to other
  parties who receive the work through you.

  8. Termination.

  You may not propagate or modify a covered work except as expressly
  provided under this License. Any attempt otherwise to propagate or
  modify it is void, and will automatically terminate your rights under
  this License (including any patent licenses granted under the first
  paragraph of section 11).

  However, if you cease all violation of this License, then your
  license from a particular copyright holder is reinstated (a)
  provisionally, unless and until the copyright holder explicitly and
  finally terminates your license, and (b) permanently, if the copyright
  holder fails to notify you of the violation by any reasonable means
  prior to 60 days after the cessation.

  Moreover, your license from a particular copyright holder is
  reinstated permanently if the copyright holder notifies you of the
  violation by some reasonable means, this is the first time you have
  received notice of violation of this License (for any work) from that
  copyright holder, and you cure the violation prior to 30 days after
  your receipt of the notice.

  Termination of your rights under this section does not terminate the
  patent licenses of any party that has received copies or rights from
  you under this License. If your rights are terminated and not
  permanently reinstated, you do not have permission to run, display,
  perform, propagate, or modify the covered works. For example, a
  program your received prior to termination may be removed from your
  computer system.

  9. Acceptance Not Required For Having Copies.

  You are not required to accept this License in order to receive or
  run a copy of the Program. Ancillary propagation of a covered work
  occurring solely as a consequence of using peer-to-peer transmission
  to receive a copy likewise does not require acceptance. However,
  nothing other than this License grants you permission to propagate or
  modify any covered work. These actions infringe copyright if you do
  not accept this License. Therefore, by modifying or propagating a
  covered work, you indicate your acceptance of this License to do so.

  10. Automatic Licensing of Downstream Recipients.

  Each time you convey a covered work, the recipient automatically
  receives a license from the original licensors, to run, modify and
  propagate that work, subject to this License. You are not responsible
  for enforcing compliance by third parties with this License.

  An "entity transaction" is a transaction transferring control of an
  organization, or substantially all assets of one, or subdividing an
  organization, or merging organizations. If propagation of a covered
  work results from an entity transaction, each party to that
  transaction who receives a copy of the work also receives whatever
  licenses the party's predecessor in interest had or could give under
  the foregoing paragraph, plus a right to possession of the
  Corresponding Source of the work from the predecessor in interest, if
  the predecessor has it or can get it with reasonable efforts.

  You may not impose any further restrictions on the exercise of the
  rights granted or affirmed under this License. For example, you may
  not impose a license fee, royalty, or other charge for exercise of
  rights granted under this License, and you may not initiate litigation
  (including a cross-claim or counterclaim in a lawsuit) alleging that
  any patent claim is infringed by making, using, selling, offering for
  sale, or importing the Program or any portion of it.

  11. Patents.

  A "contributor" is a copyright holder who authorizes use under this
  License of the Program or a work on which the Program is based.
  A newly licensed work is called the "contributor version".

  A "patent license" is any express agreement or commitment, however
  denominated, not to enforce a patent (such as an express permission to
  practice a patent or covenant not to sue for patent infringement).

  To "grant" a "patent license" to a covered work means making such an
  agreement or commitment not to enforce a patent against the work's
  users.

  An "essential patent claim" is a patent claim (other than a cross-
  license or covenant not to sue for infringement of a patent solely for
  making, using, or selling an embodiment of a Standard Interface)
  which, absent the patent license, would infringe a patent in the
  absence of another patent license, and which covers an embodiment of
  the Program.

  A "contributory patent license" is a patent license that covers
  contributor version of the work, and which is granted by a contributor
  to the recipient of the work under this License.

  A contributor's "essential patent claims" are all patent claims owned
  or controlled by the contributor, whether already acquired or hereafter
  acquired, that would be infringed by making, using, or selling the
  contributor version.

  If you convey a covered work, you hereby grant a non-exclusive,
  worldwide, royalty-free patent license under the contributor's
  essential patent claims, to make, use, sell, offer for sale, import
  and otherwise run, modify and propagate the contents of the covered
  work.

  In the following three paragraphs, a "patent license" is any express
  agreement or commitment, however denominated, not to enforce a patent
  (such as an express permission to practice a patent or covenant not to
  sue for patent infringement).

  If you institute patent litigation (including a cross-claim or
  counterclaim in a lawsuit) against any entity (including a cross-claim
  or counterclaim in a lawsuit) alleging that the Program or a covered
  work infringes a patent, then any patent license that you might have
  to the Program or a covered work, granted by that entity to you under
  this License, shall terminate automatically.

  A patent license that is "express" only if it is granted in writing
  or by an explicit statement.

  Nothing in this License shall be construed as limiting or waiving any
  implied licenses or other defenses to infringement that may otherwise
  be available to you under applicable patent law.

  12. No Surrender of Others' Freedom.

  If conditions are imposed on you (whether by court order, agreement or
  otherwise) that contradict the conditions of this License, they do not
  excuse you from the conditions of this License. If you cannot convey a
  covered work so as to satisfy simultaneously your obligations under
  this License and any other pertinent obligations, then as a
  consequence you may not convey it at all. For example, if you agree to
  terms that obligate you to collect a royalty for conveying the Program,
  and you are unable to satisfy that obligation and the obligations under
  this License simultaneously, then you may not convey it at all.

  13. Use with the GNU Affero General Public License.

  Notwithstanding any other provision of this License, you have
  permission to link or combine any covered work with a work licensed
  under version 3 of the GNU Affero General Public License into a single
  combined work, and to convey the resulting work. The terms of this
  License will continue to apply to the part which is the covered work,
  but the special requirements of the GNU Affero General Public License,
  version 3, for interactive network services will apply to the
  combination as such.

  14. Revised Versions of this License.

  The Free Software Foundation may publish revised and/or new versions of
  the GNU General Public License from time to time. Such new versions
  will be similar in spirit to the present version, but may differ in
  detail to address new problems or concerns.

  Each version is given a distinguishing version number. If the Program
  specifies that a certain numbered version of this License "or any later
  version" applies to it, you have the option of following the terms and
  conditions either of that numbered version or of any later version
  published by the Free Software Foundation. If the Program does not
  specify a version number of this License, you may choose any version
  ever published by the Free Software Foundation.

  If the Program specifies that a proxy can decide which future versions
  of this License can be used, that proxy's public statement of acceptance
  of a version permanently authorizes you to choose that version for the
  Program.

  Later license versions may give you additional or different
  permissions. However, no additional obligations are imposed on any
  author or copyright holder as a result of your choosing to follow a
  later version.

  15. Disclaimer of Warranty.

  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
  APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
  HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
  WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
  OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU
  ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

  16. Limitation of Liability.

  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
  WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
  CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
  INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
  ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
  NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSS
  ES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO
  OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY
  HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

  17. Interpretation of Sections 15 and 16.

  If the disclaimer of warranty and limitation of liability provided
  above cannot be given local legal effect according to their terms,
  reviewing courts shall apply the strongest disclaimer of all implied
  warranties and limitation of liability acting as close as possible to
  that expressed in this License without rendering the disclaimer and
  limitation wholly unenforceable.

                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
  possible use to the public, the best way to achieve this is to make it
  free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program. It is safest
  to attach them to the start of each source file to most effectively
  state the exclusion of warranty; and each file should have at least
  the "copyright" line and a pointer to where the full notice is found.

      <one line to give the program's name and a brief idea of what it does.>
      Copyright (C) <year>  <name of author>

      This program is free software: you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation, either version 3 of the License, or
      (at your option) any later version.

      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.

      You should have received a copy of the GNU General Public License
      along with this program.  If not, see <https://www.gnu.org/licenses/>.

  Also add information on how to contact you by electronic and paper mail.

  If the program does terminal interaction, start it in an interactive
  mode like this:

      A program that performs a single function like a compiler or text
      editor, or a command-line utility, should not print a notice.

      <program name>  Copyright (C) <year>  <name of author>
      This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
      This is free software, and you are welcome to redistribute it
      under certain conditions; type `show c' for details.

  The hypothetical commands `show w' and `show c' should show the appropriate
  parts of the General Public License. Of course, your program's commands
  might be different; for a GUI interface, you would use an "about box".

  You should also get your employer (if you work as a programmer) or school,
  if any, to sign a "copyright disclaimer" for the program, if necessary.
  For more information on this, and how to apply and follow the GNU GPL, see
  <https://www.gnu.org/licenses/>.

  The GNU General Public License does not permit incorporating your program
  into proprietary programs. If your program is a library, you may consider
  it more useful to permit linking proprietary applications with the library.
  If this is what you want to do, use the GNU Lesser General Public License
  instead of this License. But first, please read <https://www.gnu.org/licenses/lgpl-howto.html>.