I'm not going to give you a direct answer because I'm not to sure myself. I have found that in many cases as long as you don't have a premiere game on your site then you should be fine. What I mean by premiere game is that say the new Batman movie came out and whichever production company released the movie offers a game on their site to advertise the movie. If you find a way to steal the flash movie from them and display that on your site, that would be considered illegal. Although, I have seen other sites do these things.
If you find a definite or more precise answer for your question though, Please share
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Thanx
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