Steven Spielberg’s alien conspiracy thriller “ Disclosure Day ” collected a leading $48.9 million from 73 territories in its international box office debut. Overseas audiences will be key in the theatrical longevity of “Disclosure Day,” which Universal spent $115 million to produce and $80 million to market. Since about half of revenues go to theater owners, the movie needs to generate roughly $300 million globally to justify its price tag. Along with $44 million in North America, “Disclosure