Multilevel security is a security policy that allows the classification of data and users on a system of hierarchical security levels combined with a system of non-hierarchical security categories.

In a multilevel-secure z/OS UNIX environment, security labels are used as described in Using security labels. To set the security label on z/OS UNIX files and directories, use the chlabel command.

Restriction: Use DFDSS to back up and restore files while maintaining security labels. You cannot use the pax and tar commands.