“Smithsonian Institution Secretary Lawrence M. Small defended the Smithsonian’s television development deal with CBS/Showtime Networks yesterday, saying the agreement was not reached in secret and that restrictions in the contract would affect only a very small number of filmmakers. The Smithsonian will not release the contract; it will not even say how long it runs. Filmmakers have raised questions about the new policy, which can bar independent commercial documentary makers from more than incidental use of Smithsonian materials.”