VALVe isn't dependent upon IP protection for revenue, although I'm sure that they would swing that stick if some major operation were to pop up making profits off of their work. That short video that I linked to was produced by an independent film maker who used to believe that copyright laws protected artists, until she independently produced a full-length cartoon movie, and couldn't release it for sale because the basket of licenses required would have cost her $50K more than what it cost to produce the movie to begin with. In the end, she released the movie several years after it was finished, but for no charge. She can never charge any money for that magnum opus, yet she still manages to earn a living releasing her art as copyleft licensed work.
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That's one person. There is a free market in movies - anyone can make one. But all the good ones are made by firms that protect their IP. If you are correct, there is no need to change the law as the copyleft movies will drive the expensive copyrighted movie makers out of business.
I say this not to prove you wrong btw - my point is that we don't need to take one another's arguments as being based on faith alone. The market is working right now telling us what kind of movies people like.
And, again, you completely failed to present a counter example. Why are you here?
http://www.showcasecinemas.co.uk/showtimes/default.asp?selectTheatre=8509
Is that enough counter examples?
As I said, if IP laws are not needed for movies, you'd see copyleft movies replacing Hollywood ones. That's how a market works. At the moment you don't see that so it looks like copyleft films are not that popular.