From Michael Weinberg on the Open Source Hardware Association (OSHWA) blog:
Earlier this month CERN (yes, that CERN) announced version 2.0 of their open hardware licenses (announcement and additional context from them). Version 2.0 of the license comes in three flavors of permissiveness and marks a major step forward in open source hardware (OSHW) licensing. It is the result of seven (!) years of work by a team lead by Myriam Ayass, Andrew Katz, and Javier Serrano. Before getting to what these licenses are doing, this post will provide some background on why open source hardware licensing is so complicated in the first place.