A client-server relational database system, wherein data from the client computer is encrypted by the client computer and hosted by the server computer, the encrypted data is operated upon by the server computer, using one or more operators selected from a group of operators comprising: (a) inequality...http://www.google.de/patents/US7500111?utm_source=gb-gplus-sharePatent US7500111 - Querying encrypted data in a relational database system
