TopicTree
Copyright (c) 2026 Saavan. All rights reserved.

This work — the TopicTree source code, original lesson content, BKT
adaptive engine, content validator, math parser, homework solver, and all
other original creative work in this repository — is authored by Saavan
Gupta and is licensed under the Creative Commons
Attribution-NonCommercial-ShareAlike 4.0 International License (CC BY-NC-SA 4.0).

You are free to:

  Share — copy and redistribute the material in any medium or format
  Adapt — remix, transform, and build upon the material

Under the following terms:

  Attribution (BY) — You must give appropriate credit to Saavan as
  the original author, provide a link to this license, and indicate if
  changes were made. You may do so in any reasonable manner, but not in
  any way that suggests Saavan endorses you or your use.

  NonCommercial (NC) — You may not use the material for commercial
  purposes. Selling access, charging subscription fees, displaying ads
  alongside the material, bundling it into a paid product, or otherwise
  monetizing it directly or indirectly is not permitted.

  ShareAlike (SA) — If you remix, transform, or build upon the material,
  you must distribute your contributions under this same CC BY-NC-SA 4.0
  license. You may not release a derivative under a different license or
  as proprietary / closed-source.

  No additional restrictions — You may not apply legal terms or
  technological measures that legally restrict others from doing anything
  this license permits.

Notices:

  You do not have to comply with the license for elements of the material
  in the public domain or where your use is permitted by an applicable
  exception or limitation (e.g., fair use).

  No warranties are given. The license may not give you all of the
  permissions necessary for your intended use. For example, other rights
  such as publicity, privacy, or moral rights may limit how you use the
  material.

The full legal code is available at:
https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode

For a human-readable summary, see:
https://creativecommons.org/licenses/by-nc-sa/4.0/

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Third-party content acknowledgement:

  Curated Khan Academy video deep-links (under /videos) point to videos
  produced and hosted by Khan Academy under their own CC BY-NC-SA 4.0
  license. Khan Academy retains credit for those videos. TopicTree does
  not host or modify the videos themselves.

  Build- and runtime dependencies (Next.js, React, etc.) retain their
  individual open-source licenses; see node_modules/<package>/LICENSE.

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For licensing questions or commercial-use inquiries, open an issue at:
https://github.com/ravigupta-create/topictree-app/issues