backend/license.md

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# GNU General Public License version 3

## 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 s
ystem, 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.