I wouldn't honestly think he'd be hiding it to do that. He might think for example it could protect him from hackers.
Zone Alarm though will hide some numbers of your I.P anyway so it can't be traced. To test if it is, open it up, and go to Overview, and then the Prefrences tab at the top.
Finally select it to 'Hide my IP address when applicable' and this should help.
I hope this helps