Regenerates the security profile of a file. The default qualifier
    changes the protection code, the ACL, and the owner elements of a
    file to what it would be if the file had just been created. The
    profile is recreated according to the following rules:

    o  The protection code is propagated from the default protection
       ACE on the directory (if one exists), or else it is propagated
       from the process default.

    o  The ACL is propagated from the parent directory for those ACEs
       that have the default option.

    o  The owner is set to the owner of the parent directory.

    With subdirectory files, SET SECURITY assigns the owner,
    protection, and ACL elements of the parent directory.

    SET SECURITY does not copy any ACE on the source object if the
    ACE holds the nopropagate attribute nor does it change any ACE
    on the target object if the ACE holds the protected attribute. To
    apply new elements to all versions of the file, specify ;* in the
    object name. See the VSI OpenVMS Guide to System Security for more
    information on propagation rules.