Some game saves are identity blocked, they are made so only the ps3 that made the save can use the save. WHich is pretty stupid because you can't move your own saves from ps3 -> ps3 in case it is messed up, or you are selling it to get a better one. Or you can't play you're saves on your friend's ps3.
But there is still a good amount of games that don't block their saves.
But there is still a good amount of games that don't block their saves.