So many of u got the problem that they're receiving a key error when runnin the game from DVD+/-R.
This might be cuz SF is comparing the key to the dpm. If their not exactly the same the game won't run. Maybe some drives can fake it and let SF believe it is a scatch on the disk so SF ignores that. And the all known bug is that SF "forgets" to compare key and dpm on USB devices.
Maybe we just need a hyper perfect correct readind super DVD device to read the
REAL dpm that workz for everyone. The one of you with the newest drive should try.