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 or visit 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 or visit 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 or visit gnu.org/licenses/gpl-3.0.html.

4. Artificial Intelligence, Data Mining & Machine Learning

All materials in this repository are protected under their respective copyleft licenses (CC-BY-SA-4.0, CERN-OHL-S-2.0+, GPL-3.0-or-later).

• Reservation of TDM Rights: To the maximum extent permitted under applicable law (including Article 4(3) of EU Directive 2019/790), all rights for Text and Data Mining (TDM), automated scraping, and commercial AI ingestion are explicitly reserved.
• Copyleft Enforcement: Automated ingestion or dataset harvesting for Artificial Intelligence / Large Language Model training is strictly prohibited unless the entity training or distributing the model fully complies with the strong copyleft, attribution, and source-sharing requirements of the respective licenses.
• Contributor AI Policy: For rules regarding human contributor usage of AI tools during submission, refer to LLM_POLICY.md.

Summary of SPDX Identifiers

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