securing pg_catalog

I want to create a user that has read only access to the tables in a
schema.  I was able to configure that fine, but that user can see all of
the information in the pg_catalog schema.  I do not want this user to be
able to see anything other than the one schema, I tried revoking rights to
schema pg_catalog but the user could still see data from the pg_catalog.
Is there a way to prevent access to pg_catalog schema for a specified user?

TIA,
Mark

 Mark Miller                                            Tavve Software Co.
 Tavve Software Co.                          One Copley Parkway, Suite 480
 www.tavve.com                                      Morrisville, NC  27560
 Mark.Miller@tavve.com                                     +1 919-654-1220
                                                       fax +1 919-380-7147