seems the signature on starforce disks is so critical and without any kind of error correction, that once it has collected a few scratches you may well find your original will no longer authenticate.
Of course this is what game producers really want to hear, a protection system that is virtually uncopyable, and gives the discs a very short time out value. Starforce gives pc game disks an equivalent to the consumers the disposable DVD time bomb, but you pay full RRP for the privelage.
This will end up affecting the consumer severely as it will also hit the second game market very hard, and you never know it may also backfire on producers who use the protection.