Here's an excerpt from the announcement:
As Open Access (OA) policies and laws are being adopted world-wide, the scholarly community is shifting its efforts from advocacy towards practical implementation and support. One of the major routes for making articles open access is through OA repositories. However the variety and lack of clarity of publishers' policies regarding article deposit can be a significant barrier to author compliance of OA policies.
In order to overcome this barrier, some organizations have successfully negotiated authors' or deposit rights with publishers in the context of purchasing content licenses. This report documents the existing OA licensing language that has been implemented by organizations around the world and presents some suggestions for their successful adoption. The report concludes that OA clauses offer a feasible option for institutions to address some of the obstacles to article deposit into repositories.