Any game save where the user name is uploaded onto a high score table can't be shared. I borrowed Burnout Paradise off a mate for a week completed it 100%. He copied my save but it wouldn't load on his ps3. I have got him 33% trophies on superstardust just by logging onto his username on my system but to be honest the trophies are easy to get anyway, just look at the list on the trophy section. You willl need the expansion to complete 100% and a mate who is good to get the co-op gold trophy lol