The WRITE= option applies
to all types of SAS files except catalogs. You can use this option
to assign a password to a SAS file or to access a write-protected
SAS file.
Note: A SAS password does not control
access to a SAS file beyond the SAS system. You should use the operating
system-supplied utilities and file-system security controls in order
to control access to SAS files outside of SAS.