Well, first question, are you keeping the iBook? If yes, then you own the rights to the game. If no, the game belongs to who ever it is going to. If you are keeping the iBook, do a search for a program called DB Cooper, it lets you take your restore disks, find the dmg files on them and save them. Then you can do that and install the game on your powerbook. Like I said, this is only "legal" if you keep the iBook.