License library / Copyleft software
GNU General Public License v3.0
Run, study, change and share the software, including commercially. If you convey it or a work based on it, you must do so under the GPL with the corresponding source.
SPDX GPL-3.0-only Version 3.0 Official text
Uses at a glance
| commercial use | Permitted |
|---|---|
| production deployment | Permitted |
| modification / derivatives | Permitted |
| redistribution | Permitted |
| sublicensing | Prohibited |
| AI model training | Needs human review |
| inference-time use (RAG, prompts, generation) | Permitted |
Why some uses need review
AI model training. The license grants broad rights but attaches conditions (such as keeping notices) to copies and adaptations. Whether a trained model, or its output, is a copy or adaptation that carries those conditions is legally unsettled, and in some places training may fall under an exception such as fair use. A human reviewer should confirm this use for your case.
Duties
- give attribution / keep the notice
- license notice
- state changes
- release distributed derivatives under the same license
- provide source code with distributed derivatives
Notes
- Sublicensing is not allowed; every recipient receives a license from the original licensors (sections 2 and 10).
- Running the software, including as a network service, does not by itself trigger the duty to share source; conveying copies does.
Resources under this license
No resource in the registry is published under this license yet.
For agents
curl -s https://www.a2ally.com/v1/licenses/check -H 'content-type: application/json' \
-d '{"license":"GPL-3.0-only","intended_use":{"commercial_use":true,"deployment":true}}'Reading version 2026-10-09 by the a2ally rights desk; reference hash b7c249ef72154728916c75e08f893bb7d118a22db56f20a4ae46003c0f6169df identifies this license version: it is computed over the SPDX id, the version and the official URL, not over the license text. The license text governs; this is not legal advice.
Get a free API key in one call
No card and no email needed. 100 free credits; the license and policy checks stay free without a key.
curl -s -X POST https://www.a2ally.com/v1/accounts/signup -H "Content-Type: application/json" -d '{"accept_terms":true}'
export A2ALLY_API_KEY=rs_... # the api_key from the reply (shown once)
curl -s https://www.a2ally.com/v1/licenses/check -H "Authorization: Bearer $A2ALLY_API_KEY" \
-H "Content-Type: application/json" -d '{"license":"MIT","intended_use":{"commercial_use":true}}'