EBSCO Publishing, a database aggregator, has expanded its Shibboleth authentication service to support Shibboleth version 1.3. The standards-based, open source middleware software provides Single SignOn (SSO) for the web within organizations. Sites using Shibboleth can make authorization access decisions regulating individual access to their protected online resources. EBSCO first introduced support of the Shibboleth authentication service in 2004, in response to customer requests. Library administrators can enable any of these Shibboleth authentication services in EBSCOadmin.