LICENSE

GNU GENERAL PUBLIC LICENSE

Version 3, 29 June 2007

Copyright © 2007 Rahul
Singh

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) 2021 <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) 2021 <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>.