The document discusses security enhancements in SQL Server 2012. It describes how security was rebuilt from the ground up in SQL Server 2005 and how SQL Server 2012 builds on this foundation. Some of the new security features explored include default schemas for groups and users, user-defined server roles, contained database authentication, and encryption and auditing enhancements. Contained database authentication allows creating SQL users within a database that authenticate directly against that database, without an associated server login. This tightly scopes the security boundary to that individual database.