LICENSE

S-CSL-2.0 - Snekbooru SNEK Common Source License 2.0

Understanding Our License

Snekbooru is now distributed under the S-CSL-2.0 Common Source License. This means:

  • You can: Use, copy, modify, and distribute the Software and Derivative Works.
  • You cannot: Commercialize the Software or any Derivative Works (selling, charging for access, etc.).
  • Open Access: The source code is now common source, allowing community contributions and transparency.
  • Attribution: All copyright and license notices must be retained.

Snekbooru SNEK Common Source License 2.0 (S-CSL-2.0)

Snekbooru SNEK Common Source License 2.0
(S-CSL-2.0)

Stewarded by The SNEK Initiative

SPDX-License-Identifier: LicenseRef-SNEK-CSL-2.0

Copyright (c) 2026-present The SNEK Initiative

Licensed under the SNEK Common Source License 2.0 ("License").

1. Definitions

"Software" means the copyrighted work distributed under this
License, including source code, object code, binaries, build
artifacts, assets, configuration, documentation, examples, and
associated files.

"Derivative Works" means any work based upon, derived from,
modifying, adapting, translating, extending, incorporating, or
otherwise using all or part of the Software, excluding works that
remain separable and merely interface with the Software through
standard APIs or protocols.

"Commercialize" means to directly or indirectly derive monetary
compensation, commercial advantage, subscription revenue,
licensing revenue, usage fees, hosting fees, or other financial
benefit from the Software or Derivative Works.

"Distribute" means to provide, publish, transfer, sublicense,
share, make available, or otherwise convey the Software or
Derivative Works to any third party in source or binary form.

"You" means any individual or legal entity exercising permissions
granted under this License.

"The SNEK Initiative" means the stewarding organization responsible
for publication and maintenance of this License text.

2. Grant of Rights

Subject to the terms and conditions of this License, permission is
hereby granted, free of charge, to You to:

a. Use the Software;
b. Copy the Software;
c. Modify the Software;
d. Create Derivative Works;
e. Distribute the Software and Derivative Works;

provided that all such activities comply fully with this License.

No rights are granted except those expressly stated herein.

3. Non-Commercialization Restriction

You may not Commercialize the Software or any Derivative Works.

Prohibited conduct includes, but is not limited to:

a. Selling copies of the Software;
b. Charging license fees for the Software;
c. Charging for access to or usage of the Software;
d. Offering the Software as part of a paid product,
   subscription, platform, or bundle;
e. Providing the Software as a paid hosted service,
   managed service, or Software-as-a-Service (SaaS);
f. Relicensing the Software or Derivative Works under
   proprietary or commercial terms;
g. Restricting recipient rights granted under this License
   in exchange for payment or commercial consideration.

For clarity, internal business use of the Software that does not
involve Commercialization of the Software itself is permitted.

4. Redistribution Conditions

You may Distribute the Software or Derivative Works only if:

a. Distribution is free of charge;
b. A complete copy of this License is included;
c. All copyright, attribution, and license notices are retained;
d. Recipients receive the same rights granted under this License;
e. Derivative Works are licensed exclusively under this License.

You may not impose additional legal or technical restrictions that
limit the rights granted under this License.

5. Attribution

You must retain all existing copyright notices, attribution
notices, trademark notices, and license notices contained in the
Software.

You may add notices identifying Your own modifications or
contributions, provided such notices do not imply endorsement by
the original authors or The SNEK Initiative.

6. Paid Services Exception

Nothing in this License prohibits charging fees for professional
services related to the Software, including consulting, support,
training, auditing, customization, integration, deployment,
maintenance, or infrastructure setup, provided that:

a. No fee is charged for rights to the Software itself;
b. No fee is charged for access to the Software itself;
c. Recipients retain all rights granted under this License.

7. No Trademark Rights

This License does not grant permission to use the names,
trademarks, service marks, logos, or branding of the authors,
copyright holders, or The SNEK Initiative except as reasonably
required for factual attribution.

8. No Patent License

No express or implied patent license is granted under this
License.

9. Termination

Any violation of this License automatically and immediately
terminates all rights granted under it.

Rights under this License are reinstated automatically if the
violation is cured within thirty (30) days of receiving written
notice of the violation from a copyright holder.

Termination under this section does not limit any other remedies
available under applicable law.

10. Disclaimer of Warranty

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
NONINFRINGEMENT, TITLE, ACCURACY, OR RELIABILITY.

YOU ASSUME ALL RISKS ASSOCIATED WITH USE OF THE SOFTWARE.

11. Limitation of Liability

IN NO EVENT SHALL THE AUTHORS, COPYRIGHT HOLDERS, CONTRIBUTORS,
OR THE SNEK INITIATIVE BE LIABLE FOR ANY CLAIM, DAMAGES, LOSSES,
OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT, NEGLIGENCE, STRICT
LIABILITY, OR OTHERWISE, ARISING FROM, OUT OF, OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

12. Severability

If any provision of this License is held unenforceable or invalid,
such provision shall be interpreted to the maximum extent permitted
under applicable law, and the remaining provisions shall remain in
full force and effect.

13. No Waiver

Failure to enforce any provision of this License shall not
constitute a waiver of future enforcement of that or any other
provision.

14. Governing Law

This License shall be governed by and construed in accordance with
the laws of the jurisdiction designated by the primary copyright
holder, excluding conflict-of-law rules.

Third-Party Licenses

Snekbooru uses the following third-party libraries and resources:

  • Python - Licensed under Python Software Foundation License
  • PyQt5 / PyQt5-WebEngine - Licensed under GPL v3
  • Requests - Licensed under Apache 2.0
  • Cloudscraper - Licensed under MIT License
  • Enma - Licensed under MIT License
  • QtAwesome - Licensed under MIT License
  • PyYAML - Licensed under MIT License
  • Pillow - Licensed under HPND License
  • Next.js / React - Licensed under MIT License
  • TailwindCSS - Licensed under MIT License
  • SNEK Apollo - Licensed under SR-NR-(1.0)
  • SNEK Iluvatar - Licensed under SR-NR-(1.0)

Additional Notes

Snekbooru is now Common Source. This means while the source code is available and you are free to modify and redistribute it, you may not use it for commercial purposes.

For inquiries about commercial licensing or usage rights, please contact atroubledsnake.

Contributors

Special thanks to all contributors who have helped make Snekbooru better:

  • atroubledsnake (Creator & Lead Developer)
  • 69st (Contributor)
  • 572.lambman / nikolai.lol (Contributor)
  • _shidouuu (Contributor)