I work with PLCs and read the paper the article links to and it looks legitimate.  They do note that the PLC program is stopped for 10 seconds when the worm infects a new host which may or may not give it away depending on the process the PLC is controlling.<p>I guess I&#x27;ll start putting a password on my programs, although they point out that the protection was all based in the IDE and could be removed by writing directly to PLC.