I have 4 different runtimes.....removed judy, don, etc. a long ago, modified to eliminate "content parasite", etc., etc. I suspect mine qualifies as a "significant modification". I note that someone mentioned SR4 got rid of the anti-piracy control, but still wants to access the internet?? The anti-piracy thingee was suppose to have been eliminated with SR2.....then I read that SR3 was suppose to get rid of it. I suspect if it's not gone by now, it's taken on a life of it's own and is virtually indestructable!! It took me nearly a year to update to SR3.....looks like a similar period of time will pass before I jump on this band wagon! :)