Ask HN: What's the best approach if an idea needs the cooperation of a big corp?

Let's say you are in your 20, you are unknown and you have a big idea like Netflix or Spotify. How do you approach big corporation to get their approval? I think it doesn't matter how good is your idea, they will ignore you if you are nobody. You can't make a MPV because you don't have the rights, only a fake prototype. So, what would be the best approach?