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CC BY-NC 4.0 vs CC BY-NC-SA 4.0: what is the difference?

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TL;DR: CC BY-NC 4.0: commercial use, modification, redistribution: No. CC BY-NC-SA 4.0: the same uses: No. CC BY-NC 4.0: Share and adapt with credit, for non-commercial purposes only. CC BY-NC-SA 4.0: Share and adapt with credit, for non-commercial purposes only; adaptations you share must carry the same license.

Is cC BY-NC 4.0: commercial use, modification, redistribution allowed under Creative Commons Attribution-NonCommercial 4.0 International?

No. CC BY-NC 4.0 prohibits commercial_use.

License: Creative Commons Attribution-NonCommercial 4.0 International (CC-BY-NC-4.0, curated)

Duties: attribution, license_notice, state_changes, no_additional_restrictions

Is cC BY-NC-SA 4.0: the same uses allowed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International?

No. CC BY-NC-SA 4.0 prohibits commercial_use.

License: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC-BY-NC-SA-4.0, curated)

Duties: attribution, license_notice, state_changes, no_additional_restrictions, share_alike

How do CC-BY-NC-4.0 and CC-BY-NC-SA-4.0 compare?

The table lists each license's duties and notes side by side.

LicenseDutiesNotes
CC-BY-NC-4.0attribution, license_notice, state_changes, no_additional_restrictionsThe 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)).
CC-BY-NC-SA-4.0attribution, license_notice, state_changes, no_additional_restrictions, share_alikeThe 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)).

Combined in one work: needs_review.

What else should I know?

What are the sources?

How can I check it myself (free, no key)?

{
  "tool": "check_license",
  "arguments": {
    "license": "CC-BY-NC-4.0",
    "intended_use": {
      "commercial_use": true,
      "modification": true,
      "redistribution": true
    }
  }
}

Computed from a2ally's license profiles; not legal advice. JSON · Markdown

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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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