Here is the link to the official announcement from the Harvard University Gazette, Feb. 13, 2008:
Robert Mitchell. FAS Communications. Harvard to collect, disseminate scholarly articles for faculty: Legislation designed to allow greater worldwide access.
The legislation: the [Harvard] Faculty of Arts and Sciences (FAS) voted Tuesday (Feb. 12) to give the University a worldwide license to make each faculty member’s scholarly articles available and to exercise the copyright in the articles, provided that the articles are not sold for a profit.
The legislation was proposed by Stuart M. Shieber, a Professor at FAS.
For more background and links, see Peter Suber's article in the March 2008 SPARC Open Access Newsletter.