This is the home of the CERN Open Hardware Licence version 2. The licence consists of three variants:
A strongly-reciprocal variant, CERN-OHL-S (txt, pdf). User guide (txt, pdf).
A weakly-reciprocal variant, CERN-OHL-W (txt, pdf). User guide (odt, pdf).
A permissive variant, CERN-OHL-P (txt, pdf). User guide (odt, pdf).
You may want to read the rationale document, which explains the reasons for some of the drafting decisions, and the list of Frequently Asked Questions. If you would like to provide feedback on the licence or ask questions, please use the forum so that everybody can benefit from the discussion. For matters you would not like to bring up publicly, feel free to contact the authors (Myriam Ayass, Andrew Katz and Javier Serrano) directly.
You can find some unofficial translations of the licences, along with guidelines on how to contribute new ones, in the translations page.