LICENSE
- The repository previously had no LICENSE file. The README and every
downstream plugin README already reference GPL-3.0 ("same as
LEDMatrix project"), but the canonical license text was missing —
contributors had no formal record of what they were contributing
under, and GitHub couldn't auto-detect the license for the repo
banner.
- Added the canonical GPL-3.0 text from
https://www.gnu.org/licenses/gpl-3.0.txt (verbatim, 674 lines).
- Compatibility verified: rpi-rgb-led-matrix is GPL-2.0-or-later
(per its COPYING file and README; the "or any later version" clause
in lib/*.h headers makes GPL-3.0 distribution legal).
CONTRIBUTING.md
- The repository had no CONTRIBUTING file. New contributors had to
reconstruct the dev setup from DEVELOPMENT.md, PLUGIN_DEVELOPMENT_GUIDE.md,
SUBMISSION.md, and the root README.
- Added a single page covering: dev environment setup (preview
server, emulator, hardware), running tests, PR submission flow,
commit message convention, plugin contribution pointer, and the
license terms contributors are agreeing to.
> Note for the maintainer: I (the AI assistant doing this audit) am
> selecting GPL-3.0 because every reference in the existing
> documentation already says GPL-3.0 — this commit just makes that
> declaration legally binding by adding the actual file. Please
> confirm during PR review that GPL-3.0 is what you want; if you
> prefer a different license, revert this commit before merging.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
