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License answers

Can I use GPL 2.0+ commercially, in AI training or with modifications?

Run, study, change and share the software, including commercially. If you distribute it or a work based on it, you must do so under the GPL with the corresponding source. You may follow this version or any later version of the GPL.

UseAnswerWhy
commercial_useYesPermitted, with duties: attribution, license_notice, state_changes, share_alike, source_disclosure.
model_trainingNeeds human reviewThe 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.
modificationYesPermitted, with duties: attribution, license_notice, state_changes, share_alike, source_disclosure.
redistributionYesPermitted, with duties: attribution, license_notice, state_changes, share_alike, source_disclosure.
model_inferenceYesPermitted, with duties: attribution, license_notice, state_changes, share_alike, source_disclosure.

Duties

attribution, license_notice, state_changes, share_alike, source_disclosure

Check it by API (free, no key)

curl -s https://www.a2ally.com/v1/licenses/check -H 'content-type: application/json' \
  -d '{"license":"GPL-2.0-or-later","intended_use":{"commercial_use":true,"model_training":true}}'

MCP: call check_license at https://www.a2ally.com/mcp. Connect your agent · Full reading · Legal text

An automated reading of the license text, not legal advice. Other licenses: all license answers.

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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}}'
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