Comment. The text of the policy appears to be as previously reported: requiring deposit in RIA and allowing up to a 6 month embargo. The policy also includes a requirement that (if I understand correctly) employment and bid contracts for research conducted on behalf of the government include a clause assigning IP rights to the government, with a share of any royalties accruing to the author, and that the government will deposit these works in RIA as appropriate. I'm not a lawyer, let alone a Spanish lawyer, but the structure of the policy suggests (to me) that this latter condition is not intended to apply to scientific grantees.
The open access movement:
Putting peer-reviewed scientific and scholarly literature
on the internet. Making it available free of charge and
free of most copyright and licensing restrictions.
Removing the barriers to serious research.
I recommend the OA tracking project (OATP) as the best way to stay on top of new OA developments. You can read the OATP feed on a blog-like web page or subscribe to it by RSS, email, or Twitter. You can also help build the feed by tagging new developments you encounter.