OpenID is an third-party identification protocol that allows users to log on to multiple websites with only one username and password. Users register with one OpenID website, called an Identity Provider. The user can then log on to any website that accepts OpenID using the identity from the provider. The “OpenID Acceptor,” as it is called, will send a request to the Identity Provider, which in turn authenticates the username and password and provides a certificate to the OpenID Acceptor. This certificate, it is important to note, includes varying amounts of personal information, such as email or home addresses, phone numbers, or geographic locations. Often, OpenID providers afford the user broad control over which personal information is shared with any given OpenID Acceptor.