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# License and Legal Information
The **SAME Analog Modular Ecosystem** is an open-hardware specification and
computing platform. To properly protect hardware designs, documentation, and
executable software tooling, this repository utilizes a multi-scope open
licensing model:
* **Documentation & Prose:** Creative Commons Attribution-ShareAlike 4.0
International (`CC-BY-SA-4.0`)
* **Hardware Designs & CAD:** CERN Open Hardware Licence Version 2 - Strongly
Reciprocal (`CERN-OHL-S-2.0+`)
* **Executable Code & Tooling:** GNU General Public License v3.0 or later
(`GPL-3.0-or-later`)
## 1. Documentation and Specification
All prose, mathematical derivations, tables, rendered figures, and specification
text contained within this repository are licensed under the **Creative Commons
Attribution-ShareAlike 4.0 International License**.
* **SPDX-License-Identifier:** `CC-BY-SA-4.0`
* **Full Text:** See [`LICENSES/CC-BY-SA-4.0.txt`](LICENSES/CC-BY-SA-4.0.txt)
or visit [creativecommons.org/licenses/by-sa/4.0](https://creativecommons.org/licenses/by-sa/4.0/).
> **Note on Future Versions:** If a later version of CC BY-SA is published by
Creative Commons, you may distribute the documentation under that later version
as well.
## 2. Hardware Designs
All hardware files—including electronic schematics, PCB stackups, layout files,
Gerber files, `cetz`/`zap` mechanical drawings, 3D CAD/STEP models, and chassis and
cassette enclosure definitions are licensed under the **CERN Open Hardware
Licence Version 2 - Strongly Reciprocal**.
* **SPDX-License-Identifier:** `CERN-OHL-S-2.0+`
* **Full Text:** See
[`LICENSES/CERN-OHL-S-2.0+.txt`](LICENSES/CERN-OHL-S-2.0+.txt) or visit
[ohwr.org/cernohl](https://ohwr.org/cernohl).
## 3. Executable Code, Scripts, and Verification Tooling
All executable source code—including the Typst metrology library (`lib/*`),
currying wrappers (`lib/unify.typ`), unit test helper functions
(`lib/assert-aeq.typ`, `lib/apply-prefix.typ`), compile-time assertions, build
scripts, and simulation harnesses are licensed under the **GNU General Public
License v3.0 or later**.
* **SPDX-License-Identifier:** `GPL-3.0-or-later`
* **Full Text:** See
[`LICENSES/GPL-3.0-or-later.txt`](LICENSES/GPL-3.0-or-later.txt) or visit
[gnu.org/licenses/gpl-3.0.html](https://www.gnu.org/licenses/gpl-3.0.html).
## Summary of SPDX Identifiers
```spdx
SPDX-FileCopyrightText: 2026 Denis Chevalier <perso@denischevalier.fr>
SPDX-License-Identifier: CC-BY-SA-4.0
SPDX-License-Identifier: CERN-OHL-S-2.0+
SPDX-License-Identifier: GPL-3.0-or-later
```
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