Sony makes CDs that cannot be listened on PC so they cannot be copied. Sony also work with RealNetworks and they announced that they agreed for exchenging the technologies they use. RealNetworks will use the ATRAC3 format of Sony on its program (Real Player), also Sony's digital machines will have the RealOne Player, but it will see to incorporate the Sony's technology OpemMG, a technology for the admining of digital rights for services.