SketchFactor has posted on Bungie.net that the PC version of Halo is getting a security patch through the auto-update mechanism to keep it in step with a needed security fix for the dedicated server. Both changes are to protect against an exploit on the GameSpy CDKey SDK. Both the Halo PC client and dedicated server will now be version 1.04. The story at Bungie net has a link to the updated dedicated server. There's no word on what, if any other changes, are in this version, or how this affects Mac clients.