Hardware license

Which license should we use for designs and hardware produced as part of the OMX project?

There are several options. All have some advantages and some disadvantages:
 * CC0 - Close to Pubic Domain, no restrictions but explicitly places the work in the public domain in territories where public domain is not recognised as a type of license.
 * c,mm,n - Open Product Licence from c,mm,n
 * TAPR - Website
 * OSHW - Website