I want to open a new website that can convert youtube videos to mp3 and users to download it. Legit? Or i can be sued?
It is indeed legal but they patched some methods (e.g. the one using Youtube's API). Check out youtube-mp3.org . The guys Adsense account was recently banned for his service but he can't be sued that is for sure. It is legal and you don't have to worry mate