depends on the tech you speak to. i had a scratched install disk 1 that would bug out at 89% and while the cool folks at the apple store did a full system restore, the applecare techs gave the run around. first that said cool, we'll mail you a new copy, no charge. i never got it so i called back and they had no record of the previous conversation but that tech was more than happy to charge me $30 per CD that needed replacing. i said thanks, but no thanks and bought a complete non-copied set from someone.