Hmmmm, Funny that you should ask that; Before I tell you my experience, My PC has Norton SystemWorks installed and it's up all the time and it informs me of any type Goings-ons regarding outside stuff trying to gain entry,The majority of the members who read this allready are familiar with it; Anyway, When I had SR2 installed into my Poser 7 program, It (The SR2 file) turned my PC and/or my security program into an extremely annoying anti-piracy cop; Now, I paid for my Poser software, But whoever thought this up at E-Frontier did'nt have both oares in the water; When I start my Poser 7 program now(after SR2) and start working in it, Every 15 seconds, A warning window would pop up,Blocking my view of my work and telling me that an outside source(Hmmm,let me guess, E-Frontier?)is trying to gain entry,Click 'Permit' to allow it; like my poser program I paid for is telling them"Hey! I don't know if this guy paid for this program,Can you check his receipt?"; When I shut my modem off, I can't operate my Poser 7 program; It's like when you go to a movie and while you're trying to enjoy it and follow the story, The usher would tap you on the shoulder every 30 seconds or so and ask to see your ticket stub; I'm sorry but it's extremely annoying;other than that, No noticable difference in the program.