The user's name for authorization purposes. The value of
xcmJobAuthorizationUserName may be the same or may be different
than the value of the xcmJobAccountingUserName object, depending
on the security system and the accounting system being used.
ISO DPA: User-name
This attribute specifies the name of the user requesting access
to print [or other] service operations. The usage of
this attribute may be mandatory, depending upon the local
security policy used.