As far as I know, there is no need to add to the standard Mac security package. I've got OS9.2 running on one of my other machines and have never seen the need to add anything to it. Indeed, I would tentatively warn you against adding anything. For example, the Norton Antivirus packages will actually interfere with the quality of your machine's performance. So, download with confidence when it comes to any viruses that might be out there (they are aimed at Microsoft — did you see that Passport had to be shut down last Thursday? How sad given their Palladium claim to be improving security!) The only thing to beware are the porn site autodialers if you are on a dial-up modem. Go into Limewire and set your filters to exclude !!! and / and AWESOME. That should keep you free to download without any hidden surprises.