The com.ms.security package has the following hierarchy:
Object | +--EncodeFormats | +--PermissionDataSet (IEncodablePermission, com.ms.util.SetComparison) | +--PermissionDataSetEnumerator (Enumeration) | +--PermissionID | +--PermissionSet | +--PermissionUtils | +--PolicyEngine ClassLoader | +--SecurityClassLoader SecurityException | +--SecurityExceptionEx | +--PermissionRequestDeniedException SecurityManager | +--StandardSecurityManager OutputStream | +--PermissionTreeOutput IAdjustablePermission IEncodablePermission IPermission ISecurityRequest