Licensing & IP

Licenses

The canonical, citable home for every license MARC27 applies to its software, models, datasets, and research. Each entry has its full terms, a plain-English summary, and a clear marker of whether it is open source or source-available.

Published reference snapshots are released under permissive open licenses (MIT, CC-BY). Complete or in-development frameworks are held under the source-available MARC27 license — visible and citable, but not open source. Any page below can be linked directly from a paper, a repository, or an IP declaration.

Source-availableLicenseRef-MARC27-SA-1.0

MARC27 Source-Available License

Inspect, evaluate, and research — but no commercial use, redistribution, or derivatives without a written agreement. Source-available, not open source.

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Open sourceMIT

MIT License

Do almost anything, including commercial use — just keep the copyright notice. OSI-approved open source.

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Open sourceApache-2.0

Apache License 2.0

Permissive open source with an explicit patent grant. OSI-approved.

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Open contentCC-BY-4.0

Creative Commons Attribution 4.0

Share and adapt freely, including commercially, with attribution. For documents and data — not software.

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