After Steve Jobs wrote that music companies should abandon digital copy protection, Warner Music chief Edgar Bronfman called on Apple to open up its iTunes software to other forms of DRM: "DRM and interoperability are not the same thing, Warner Music believes very strongly in interoperability. Consumers want it and consumers should have it. But there cannot be so much protection that you create a poor consumer experience, and we need to find a better balance than exists today." In a separate conference call, Bronfman pointed to mobile devices as the future of the industry and praised Apple"s upcoming iPhone: "The opportunity for mobile is huge and it is remarkable that we are selling as much music as we are on mobiles given how difficult it is to access. The average ring-tone download is two and a half minutes and takes 20 clicks. If you could make that two or three clicks, if you could make that 10 seconds, the amount of revenue that would unlock is extraordinary."