I'm uncertain if the GPLv3 ^[1]^, or something from Creative Commons ^[3]^, like the CC-BY-SA ^[2]^ license, would be appropriate for open source hardware. I've come across the CERN-OHL-S ^[4]^, which appears interesting, but I've never encountered it in the wild, so I'm wary of it's apparent obscurity.

References

Type: Webpage. Title: "GNU General Public License". Publisher: "GNU Operating System". Accessed: 2025-09-04T21:29Z. URI: https://www.gnu.org/licenses/gpl-3.0.en.html.
Type: Webpage. Title: "Attribution-ShareAlike 4.0 International". Publisher: "Creative Commons". Accessed: 2025-09-04T21:30Z. URI: https://creativecommons.org/licenses/by-sa/4.0/deed.en.
Type: Webpage. Title: "About CC Licenses". Publisher: "Creative Commons". Accessed: 2025-04-09T21:31Z. URI: https://creativecommons.org/share-your-work/cclicenses/.
Type: Text. Title: "CERN Open Hardware Licence Version 2 - Strongly Reciprocal". Publisher: "CERN". Accessed: 2025-04-09T21:33Z. URI: https://gitlab.com/ohwr/project/cernohl/-/wikis/uploads/819d71bea3458f71fba6cf4fb0f2de6b/cern_ohl_s_v2.txt.

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[–] interdimensionalmeme@lemmy.ml 8 points 1 month ago

            
              

License Type
Example License(s)
Can someone “pull the ladder up” after building on your work?
Can you integrate their improvements freely?
Notes


🟥 Strong Copyleft
CERN-OHL-S, GPLv3
❌ No — downstream must open their changes
✅ Yes — everyone must share improvements
Keeps the community free, but restricts proprietary use

🟧 Weak Copyleft
CERN-OHL-W, LGPL
⚠️ Limited — changes to original must be open, but addons can be closed
✅ Mostly — improvements to original are open
Allows extensions/plugins to be proprietary

🟨 Permissive
CERN-OHL-P, Solderpad, MIT
✅ Yes — downstream can close everything
❌ No — unless you get permission, you can't use their closed changes
Maximizes adoption, but allows ladder-pulling

🟦 Dual Licensing
GPL + commercial, or CLA-based
⚠️ Controlled — you allow copyleft for the public, but retain rights for commercial licensing
✅ Yes — you retain full rights via CLA
Good if you want community contributions and a commercial option

⚪ Documentation-only (CC-BY, etc.)
CC-BY, CC-BY-SA
⚠️ Depends — not designed for functional hardware, may not protect source
❌ Unclear — source availability not enforceable
Use only for manuals, not functional designs



            
          

License Type	Example License(s)	Can someone “pull the ladder up” after building on your work?	Can you integrate their improvements freely?	Notes
🟥 Strong Copyleft	CERN-OHL-S, GPLv3	❌ No — downstream must open their changes	✅ Yes — everyone must share improvements	Keeps the community free, but restricts proprietary use
🟧 Weak Copyleft	CERN-OHL-W, LGPL	⚠️ Limited — changes to original must be open, but addons can be closed	✅ Mostly — improvements to original are open	Allows extensions/plugins to be proprietary
🟨 Permissive	CERN-OHL-P, Solderpad, MIT	✅ Yes — downstream can close everything	❌ No — unless you get permission, you can't use their closed changes	Maximizes adoption, but allows ladder-pulling
🟦 Dual Licensing	GPL + commercial, or CLA-based	⚠️ Controlled — you allow copyleft for the public, but retain rights for commercial licensing	✅ Yes — you retain full rights via CLA	Good if you want community contributions and a commercial option
⚪ Documentation-only (CC-BY, etc.)	CC-BY, CC-BY-SA	⚠️ Depends — not designed for functional hardware, may not protect source	❌ Unclear — source availability not enforceable	Use only for manuals, not functional designs