CERN Open Hardware Licence
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The CERN Open Hardware Licence (OHL or CERN OHL) is an open-source hardware licence[lower-alpha 1] created by CERN. The licence comes in three variants: strongly reciprocal[lower-alpha 2] (CERN-OHL-S), weakly reciprocal (CERN-OHL-W), and permissive (CERN-OHL-P).