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,
our General Public Licenses are 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.

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.

Developers that use our General Public Licenses 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.

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.
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.

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.

"User Product" means 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.

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.

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.

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.

   Copyright (C)  YEAR  NAME OF AUTHOR
   <one line to give the program's name and a brief idea of what it does.>
   Copyright (C)  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/>.

If your program does terminal interaction, make it output a short notice like
this when it starts in an interactive mode:

   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 GNU 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.

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

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.