... And it's the right mandate: Immediate-Deposit/Optional-Access
(ID/OA). (The embargo ceiling -- 18 months -- is a bit too high, but
that's minor, compared to the splendid and timely example set by
adopting the optimal mandate.) Gefeliciteerd, Nederland!

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>From ROARMAP http://roarmap.eprints.org/537/

Royal Netherlands Academy of Arts and Science - KNAW (24 Oct 2011)

INSTITUTIONAL MANDATE

INSTITUTION's URL: http://www.knaw.nl

MANDATE URL and TEXT:

Brief outline of policy for publications: All Academy publications are
basically made publicly accessible within eighteen months after
publication.

What to preserve digitally? All publications, preferably the
publisher’s version, otherwise the final author’s version.

Where to preserve digitally? In the Academy publications repository at
http://depot.knaw.nl.

When should material be uploaded to the repository? Preferably
immediately after the publication has been accepted, but no later than
the official publication date. [emphasis added]

What material should be openly accessible? All publications are
available within the Academy. Outside the Academy, the following
exceptions are possible:

(1) The publisher does not approve open access. The researcher retains
the correspondence with the publisher.

(2) The management of the institute chooses a publisher that applies a
longer embargo period.

When should material be made openly accessible? Preferably immediately
after it has been accepted. An embargo of at most eighteen months
after publication is possible (determined by the management of the
institute). [emphasis added]

Link to policy document: in English
http://www.knaw.nl/Pages/DEF/29/838.bGFuZz1FTkc.html
 or in Dutch. http://www.knaw.nl/openaccess

Policy: http://roarmap.eprints.org/537/1/knaw-flyer-open-access-en.pdf