ORLANDO, Fla. - Walt Disney Co.'s 1946 film "Song of the South" was historic. It was Disney's first big live-action picture and produced one of the company's most famous songs _ the Oscar-winning "Zip-a-Dee-Doo-Dah." It also carries the story line of the Splash Mountain rides at its theme parks. But the movie remains hidden in the Disney archives _ never released on video in the United States and criticized as racist for its depiction of Southern plantation blacks. The film's 60th anniversary passed last year without a whisper of official rerelease, which is unusual for Disney, but President and CEO...