In another page from the Stanford Center, Peter Hirtle has written a good essay regarding the issues of digital preservation. Although issues of preservation copying exist with a legal context that is murkey at best, Hirtle remains encouraging for libraries and archives.
He cites two more works in his notes for further reading:
June Besek, "Copyright issues relevant to the creation of a digital archive: a preliminary assessment" (Washington, D.C.: Council on Library and Information Resources and the Library of Congress, 2003) http://www.clir.org/pubs/reports/pub112/contents.html
Adrienne Muir, "Copyright and licensing for digital preservation" Library and Information Update, June 2003 http://www.cilip.org.uk/update/issues/jun03/article2june.html
Digital Preservation and Copyright by Peter Hirtle