Transcript for 'Concussion' Enlists Will Smith to Tackle the Dangers of Football
Now some legal experts say cases like Tseng's could set a new deflated footballs this set for Christmas day could provide a prior controversy. Concussions from some of the game's big hits. I found a disease that one has ever seen. Reporter: This morning the national football league facing another wave of attention for its ongoing problems. Repetitive head trauma chokes the brain. Reporter: Sony releasing the trailer for its new movie "Concussion" set for release Christmas day features megastar will smith as Dr. Bennet omalu who discovered the brain disease chronic traumatic encephalopathy or cte in the brains of former football players and his effort to warn NFL's top dogs in going to war with a corporation that owns a day of the week. Reporter: The disease which can be diagnosed only after death discovered in players like junior sea who took his own life. Bisqasically a two-hour tutorial on concussions and the NFL can't pretend it doesn't exist. Reporter: The film's trailer suggesting the NFL didn't want to face the disease. The NFL does not want to talk to you. You've turned on their lives and given their biggest beingnyman a name. Something the real Dr. Omalu discussed with ABC news in 2013. Most of these sports organizations did not embrace it. We were somewhat in a phase of denial. Reporter: But the NFL who recently agreed to a settlement plan for thousands of retired players who suffered concussions and other serious ailments during their career which could cost them a billion dollars wouldn't comment on the film, but told us "We all know more about this issue than we did 10 or 20 years ago" and adding "We are encouraged by the ongoing focus on the issue of player health and safety. We have no higher priority." A "New York times" report Tuesday saying e-mails from the Sony hacking scandal indicate the studio softened certain aspects to not run afoul of the league. One e-mail claiming they would work with NFL consultants on messaging to avoid conflict with the league. But the film's writer reportedly saying in an interview, filmmakers weren't watering down the film but instead trying to make it as accurate as possible. Now, experts say concussions are a concern on every level of the sport. Head injury fears contributing to a drop of pop Warner players and spurring a San Francisco 49er Chris borland to walk away from a multimillion dollar contract but this art imitating life could create more problems for the NFL. Certainly going to keep the debate going.
This transcript has been automatically generated and may not be 100% accurate.