This read-create string (1-40 characters) supplies the password used to authenticate ftp, sftp, or scp transfers, and reads back as a zero-length string for security even after being set. Admins configure it alongside copyUserName so the device can complete an authenticated file transfer. For example, an admin automating config backups to an FTP server would set copyUserPassword once when creating the copy row, knowing a later SNMP read will never reveal it.