The Bill & Melinda Gates Foundation has announced the world’s strongest policy in support of open research and open data. see: http://www.gatesfoundation.org/how-we-work/general-information/open-access-policy
As from January 2015, Gates-funded researchers must make open their resulting papers and underlying data-sets immediately upon publication. Papers must be published under the Creative Commons Attribution 4.0 license (CC BY) allowing unrestricted re-use; including for commercial purposes.
“We believe that published research resulting from our funding should be promptly and broadly disseminated” the Foundation states. During the transition a 12-month embargo period may apply. The Foundation will also meet any necessary publication fees.