At my university, all computer users are required to use antivirus in order to use the campus-wide wireless. For PC users, they use Trend Micro and for Mac users, we have to use Norton and the university provides the antivirus for free. It doesn't do much except just sit there from what I can tell. Since I recently switched from PC to Mac in January, I'm used to having antivirus on a computer so it's not big deal to have it on my Mac whether I need it or not.