Big media players are accustomed to watching the ratings for the most popular music, video and book content. But perhaps they should pay more attention to how consumers feel about three letters at the bottom of most charts--DRM, which stands for digital rights management.Broadly defined, DRM encompasses multiple technologies that control the use of software, music, movies or any other piece of digital content. These technologies typically prevent consumers from moving content around to multiple devices and limit how the content can be used. special reportSony's rootkit fiasco Storm over label's antipiracy software raises questions about who owns the desktop....