# NOTICE

OTKO
Copyright © 2026 Ozan and contributors.

## OTKO license

OTKO's own source code is licensed under the **GNU Affero General Public
License v3.0** (AGPL-3.0). The full text is in [`LICENSE`](LICENSE). This
`NOTICE` file does not replace or modify that license; where the two
disagree, `LICENSE` governs.

OTKO is **not** an MIT-licensed project. Portions of the codebase were
ported or adapted from an earlier, MIT-licensed prototype called
`otko-development`, so the original MIT notice is reproduced below as
required by that license.

## Ported / adapted code: `otko-development`

Portions of OTKO were ported or adapted from the `otko-development`
project, which is distributed under the MIT License. The MIT
copyright and permission notice is reproduced verbatim below:

```
MIT License

Copyright (c) 2026 OTKO contributors

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
```

## Ported / adapted code: `opstool`

The canvas element colour palette in `src/otko/views/canvas3d/style.py`
(per-family element colours and the diverging response colour scale) and the
resulting diagram colouring in `views/canvas3d/diagram_renderer.py` were
adapted from the `opstool` project, which is distributed under the **GNU
General Public License v3.0**. opstool is Copyright © Yexiang Yan and
contributors.

In accordance with GPLv3 §5(a)/(b) this notice records that the material was
modified and adapted for OTKO. Combining the GPLv3-covered material with
OTKO's AGPL-3.0 code is permitted by GPLv3 §13; the combined work is
conveyed under AGPL-3.0, and the GPLv3 terms continue to apply to the
opstool-derived portions.

## Runtime dependencies

OTKO depends on third-party software that is not covered by OTKO's
AGPL-3.0 license. Each component remains under its own license, and its
license text ships with the corresponding package. The notes below are a
summary for attribution, not a substitute for those license texts.

- **OpenSees / OpenSeesPy** — the finite-element solver invoked by
  `otko.services.opensees_runner`. OpenSees is copyright The Regents of
  the University of California and is distributed under a BSD-style
  license; the notice is shipped inside the `openseespy` package.
- **PySide6** — the Qt 6 bindings used by the desktop GUI. PySide6 is
  available under the GNU Lesser General Public License v3 (LGPLv3) or a
  commercial license. OTKO links against it dynamically, which keeps the
  LGPL relinking obligation satisfiable for redistributors.
- **numpy**, **pydantic**, **h5py**, **pyvista**, **VTK**,
  **pyqtgraph**, and **imageio** — each is distributed under its own
  license (for example BSD-3-Clause, MIT, and similar permissive terms).
  See the license file bundled with each installed package for the exact
  terms.

When redistributing OTKO, keep `LICENSE`, this `NOTICE`, and the license
notices of the dependencies above.