Berlin Declaration
Open Access to Knowledge in the Sciences and Humanities
The pertinent passages (updated in green):

“Open access [means]:

“1. immediate free... [online, full-text] access to published research articles

“2. A complete version of every search article... is deposited...
        in at least one online repository... to enable open access, unrestricted distribution, [OAI] interoperability, and long-term archiving.

“[W]e intend to... (1) require... our researchers/grant recipients to
   self-archive all their research articles in our own institutional repository and to (2) encourage them to  make them... open access.”