title: Open Source Database with encryption at rest and auditing functionaility
body: <p>The organisation I work at usually uses Oracle or SQL Server for our databases.  However we have a requirement to create only a small database, but the small amount of data it will hold is highly sensitive (IL3).  </p>
  
  <p>It has been specified that we need to encrypt the data 'at rest' and provide auditing of anyone looking at records in the database.  </p>
  
  <p>We know that SQL Server and Oracle can do that.  But as this server will not be able to utilize existing licenses, an expensive edition of the database would be required to provide the functionality that is required.  Thus we are considering alternatives with lower or no licensing costs.</p>
  
  <p>We need to also be able to use a connector from Entity Framework Connector.</p>
  
  <p>Are there any open source databases that can deliver that functionality?<br>
  Can Postgresql provide that functionality?</p>
  
  <p>Thanks,
  DavidC</p>