Explain the NFL Collective Bargaining agreement?

Well, The NFL owners and administrators want to take a billion dollars out of player salaries and use it to do marketing and other things. Now yes NFL players make alot of money but you don't know what they go through to be the best, I my self am a D1 college player right now and it hurts all those vigorous workouts, those players risk their lives for something they love and we love to watch! Now who do you think is right? The NFL has no right to tap into player salaries especially for marketing! Like who needs marketing for the NFL it's the national football league!