License library / Creative Commons

Creative Commons Attribution-NonCommercial 4.0 International

Share and adapt with credit, for non-commercial purposes only.

SPDX CC-BY-NC-4.0 Version 4.0 Official text

Uses at a glance

Why some uses need review

AI model training. Creative Commons licenses grant rights to reproduce and adapt the material, with conditions that apply when it or an adaptation is shared. Whether training a model creates an adaptation, and how attribution applies to a trained model or its output, is not settled; Creative Commons notes that training may also fall under exceptions such as fair use. A human reviewer should confirm this use for your case.

Duties

• give attribution / keep the notice
• license notice
• state changes
• no additional restrictions

Notes

• The grant is non-sublicensable: every recipient receives the license directly from the licensor (section 2(a)(5)).
• You may not apply legal terms or technical measures that restrict recipients from exercising the licensed rights (section 2(a)(5)(C)).

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":"CC-BY-NC-4.0","intended_use":{"commercial_use":true,"deployment":true}}'

Reading version 2026-10-09 by the a2ally rights desk; reference hash a244be22236b539f9ea48d0fda1f17b38d98018426bf94232803edf090929c9a 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.

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}}'