Sony's contracted with a peer-to-peer company to allow legal P2P distribution. For about $30 (assuming this comes to America soon), users will be allowed to freely exchange Sony files.
I'm assuming this is a cave on Sony's part, and admission they simply can't police P2P exchange. So they compromise. Expect others to follow suit the next year. Hopefully, this will bring down the reign of RealNetworks, the only company more insanely propietary than Apple. Death to corporate spyware!