Forgive me if you've already answered this, but how could I get away with publishing my own content for use on TV/Movies/Commercials, without going through a third party?
I'm not sure what you mean by get away with, but you can publish whatever you want. I think you're asking how to pitch your material without a third party? I personally haven't tried, and haven't had much luck even with third parties. It'll take a lot of hard work and perseverance to build the required network.