How does this site not violate copyright law? I love the idea, but as it is, I feel like a nasty letter from the RIAA is being carried by a postman still wet fr

How does this site not violate copyright law? I love the idea, but as it is, I feel like a nasty letter from the RIAA is being carried by a postman still wet from the tongue of some RIAA lawyer. Anyway, don't let that set you back. It seems great.