Thanks to everyone who commented on my question regarding proxying Google Book Search. On looking into this further, it appears to me that current techniques for proxying would not be able to enhance privacy for Google Book Search once the provisions of the settlement agreement are implemented. http://go-to-hellman.blogspot.com/2009/08/what-google-books-settlement-agreement.html I am in the process of looking at other technologies to see if there are alternatives. Hence another question: Does anyone know of libraries that have done anything with "attribute release" in the context of SAML/Shibboleth? Thanks! Eric Hellman President, Gluejar, Inc. 41 Watchung Plaza, #132 Montclair, NJ 07042 USA [log in to unmask] http://go-to-hellman.blogspot.com/