LICENSE

GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007

Copyright © 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 apply it to 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 systematic 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
the 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 to protect the freedom of users.

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 assures 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 kind 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 (for an executable work) 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 for the work, 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 conditions 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.

    Conveying under any other circumstances is permitted solely under the
    conditions stated below. Sublicensing is not allowed; section 10 makes it
    unnecessary.  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 forbid 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
    further 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
    (operated by you or a third party) that supports equivalent copying
    facilities, provided you maintain clear directions next to the object code
    saying where to find the Corresponding Source. Regardless of what server
    hosts the Corresponding Source, you remain obligated to ensure that it is
    available for as long as needed to satisfy these requirements.  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 regardless of whether the product has substantial commercial,
    industrial or non-consumer uses, unless such uses represent the only
    significant mode of use of the product.

    "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 support service, warranty, or updates
    for a work that has been modified or installed by the recipient, or for the
    User Product in which it has been modified or installed. Access to a
    network may be denied when the modification itself materially and adversely
    affects the operation of the network or violates the rules and protocols
    for communication across the network.

    Corresponding Source conveyed, and Installation Information provided, in
    accord with this section must be in a format that is publicly documented
    (and with an implementation available to the public in source code form),
    and must require no special password or key for unpacking, reading or
    copying.  7. Additional Terms.  "Additional permissions" are terms that
    supplement the terms of this License by making exceptions from one or more
    of its conditions. Additional permissions that are applicable to the entire
    Program shall be treated as though they were included in this License, to
    the extent that they are valid under applicable law. If additional
    permissions apply only to part of the Program, that part may be used
    separately under those permissions, but the entire Program remains governed
    by this License without regard to the additional permissions.

    When you convey a copy of a covered work, you may at your option remove any
    additional permissions from that copy, or from any part of it. (Additional
    permissions may be written to require their own removal in certain cases
    when you modify the work.) You may place additional permissions on
    material, added by you to a covered work, for which you have or can give
    appropriate copyright permission.

    Notwithstanding any other provision of this License, for material you add
    to a covered work, you may (if authorized by the copyright holders of that
    material) supplement the terms of this License with terms: a) Disclaiming
    warranty or limiting liability differently from the terms of sections 15
    and 16 of this License; or b) Requiring preservation of specified
    reasonable legal notices or author attributions in that material or in the
    Appropriate Legal Notices displayed by works containing it; or c)
    Prohibiting misrepresentation of the origin of that material, or requiring
    that modified versions of such material be marked in reasonable ways as
    different from the original version; or d) Limiting the use for publicity
    purposes of names of licensors or authors of the material; or e) Declining
    to grant rights under trademark law for use of some trade names,
    trademarks, or service marks; or f) Requiring indemnification of licensors
    and authors of that material by anyone who conveys the material (or
    modified versions of it) with contractual assumptions of liability to the
    recipient, for any liability that these contractual assumptions directly
    impose on those licensors and authors.

    All other non-permissive additional terms are considered "further
    restrictions" within the meaning of section 10. If the Program as you
    received it, or any part of it, contains a notice stating that it is
    governed by this License along with a term that is a further restriction,
    you may remove that term. If a license document contains a further
    restriction but permits relicensing or conveying under this License, you
    may add to a covered work material governed by the terms of that license
    document, provided that the further restriction does not survive such
    relicensing or conveying.

    If you add terms to a covered work in accord with this section, you must
    place, in the relevant source files, a statement of the additional terms
    that apply to those files, or a notice indicating where to find the
    applicable terms.

    Additional terms, permissive or non-permissive, may be stated in the form
    of a separately written license, or stated as exceptions; the above
    requirements apply either way.  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 third 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 some 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
    licenses of parties who have received copies or rights from you under this
    License. If your rights have been terminated and not permanently
    reinstated, you do not qualify to receive new licenses for the same
    material under section 10.  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 to the work the
    party's predecessor in interest had or could give under the previous
    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. The work thus licensed is called the contributor's
    "contributor version".

    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 some manner, permitted by this
    License, of making, using, or selling its contributor version, but do not
    include claims that would be infringed only as a consequence of further
    modification of the contributor version. For purposes of this definition,
    "control" includes the right to grant patent sublicenses in a manner
    consistent with the requirements of this License.

    Each contributor grants you 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 its contributor version.

    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). To "grant" such a patent license to a party means to
    make such an agreement or commitment not to enforce a patent against the
    party.

    If you convey a covered work, knowingly relying on a patent license, and
    the Corresponding Source of the work is not available for anyone to copy,
    free of charge and under the terms of this License, through a publicly
    available network server or other readily accessible means, then you must
    either (1) cause the Corresponding Source to be so available, or (2)
    arrange to deprive yourself of the benefit of the patent license for this
    particular work, or (3) arrange, in a manner consistent with the
    requirements of this License, to extend the patent license to downstream
    recipients. "Knowingly relying" means you have actual knowledge that, but
    for the patent license, your conveying the covered work in a country, or
    your recipient's use of the covered work in a country, would infringe one
    or more identifiable patents in that country that you have reason to
    believe are valid.

    If, pursuant to or in connection with a single transaction or arrangement,
    you convey, or propagate by procuring conveyance of, a covered work, and
    grant a patent license to some of the parties receiving the covered work
    authorizing them to use, propagate, modify or convey a specific copy of the
    covered work, then the patent license you grant is automatically extended
    to all recipients of the covered work and works based on it.

    A patent license is "discriminatory" if it does not include within the
    scope of its coverage, prohibits the exercise of, or is conditioned on the
    non-exercise of one or more of the rights that are specifically granted
    under this License. You may not convey a covered work if you are a party to
    an arrangement with a third party that is in the business of distributing
    software, under which you make payment to the third party based on the
    extent of your activity of conveying the work, and under which the third
    party grants, to any of the parties who would receive the covered work from
    you, a discriminatory patent license (a) in connection with copies of the
    covered work conveyed by you (or copies made from those copies), or (b)
    primarily for and in connection with specific products or compilations that
    contain the covered work, unless you entered into that arrangement, or that
    patent license was granted, prior to 28 March 2007.

    Nothing in this License shall be construed as excluding or limiting any
    implied license 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 further conveying from
    those to whom you convey the Program, the only way you could satisfy both
    those terms and this License would be to refrain entirely from conveying
    the Program.  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, section 13, concerning interaction
    through a network 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 the GNU General Public 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 the GNU General Public 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
    the GNU General Public 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 LOSSES 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 local law that most closely approximates an absolute
    waiver of all civil liability in connection with the Program, unless a
    warranty or assumption of liability accompanies a copy of the Program in
    return for a fee.

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, make it output a short notice like
this when it starts in an interactive mode:

<program> 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 subroutine 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/why-not-lgpl.html>.