Tom,
Why the hell did you change the music? You didn't have to.
As owners of the copyright and all other rights to the music we insist that you immediately remove the music from your site.
So what the Who Wants to Be A Millionaire game is copyrighted. He cannot take you to a US court due to the fact that you didn't make any profit from the Pico -vs- Uberkids game. If you made the game, then you sell it to another web site and made even a dollar, then I could see the problem.
If you want to get technical about it and you have a lot of time to kill, read the US Constitution, Article I, Section 8. Read it carefully! Under the Constitution you have done nothing wrong.
Isn't the Who Wants to Be A Millionaire game based in another country anyways? I'm not sure what their Copyright Law is, but I'm pretty sure its that same as ours. All they really can do is threaten you and waste your time.
There is a big argument in the EU (European Union) today about the definition of copyright infringement, which is a bigger issue there than over here (hard to believe but true). Maybe in the future the laws may change, but not anytime soon. If you were taken to court, chances are you would win and if they try to take you to court again, it wouldn't go to court due to a law called Double Jeopardy (prohibited by the 5th Amendment of the US Constitution).
Although I may be wrong, but I'm about 85% sure all the shit I just said is true!
Fight The Power,
Jay
PS: Hey Matt Speller, kiss the dancing bady's ass!