-- The movie "Concussion" examines the devastating effects repeated head traumas can have on the brains of professional football players.
Sony has also arranged private screenings in each team's city in advance of its Christmas Day opening.
Dr. Betsy Nabel, the NFL's chief medical adviser, told "Good Morning America" that she believes the film will "have a positive impact on raising awareness about head injury. And I think it will make clear that the league has a very clear commitment to player health and safety."
"Will Smith gives one of the best performances of his career as Dr. Bennet Omalu, a man who shined a light on the truth," the producers said. "The odds were stacked against him, but he had the truth on his side, and now, his discovery is all anyone's talking about. We think the players will enjoy watching this movie about Dr. Omalu's incredible courage - courage that changed the game."