A server system provides a client system with a number of on-line services including a log-in service. Once the server receives a request from the user for initiating access to the server, the log-in service accesses a user database for information including access privileges of the authorized user in...http://www.google.de/patents/US6311207?utm_source=gb-gplus-sharePatent US6311207 - Method of using electronic tickets containing privileges for improved security
