Want to own a piece of the studio that produced Saving Private Ryan? If you're a big player, you may soon have a chance to do so—through your broker. DreamWorks SKG, the entertainment combine founded by Stephen Spielberg, Jeffrey Katzenberg, and David Geffen, wants to raise $525 million through the sale of debt securities. The infusion of cash will be used to refinance old debts as well as to fund new productions, and will be repaid by worldwide box-office receipts, and video revenues from movies already in inventory or as yet unmade.