pirates of the carribean...help needed

[lynxz]

wonder if someone could offer some advice....have copied using clone cd and managed to get a perfect copy...data wise...but on firing up the game with the copied CD1 in drive it doesn`t work and obviously needs something thats missing on the (copied) CD1 ... if i then put the original CD1 it in drive....it works!! (thats why i know the actual datas ok) so i just wondered if you people could offer any help , is it just a nocd prob? if so any ideas where i an get the crack, i`ve had no luck so far....or is it some other more devious kind of protection??? thanks for any help