I realize that this is a little out of date, but I just now caught an interview with Feargal Sharkey regarding music rights, and thought people who were interested about that sort of thing in regards to books might want to give this a listen.
Really, if you just substitute "digital media" for "digital music", the ideas and probably even a lot of the statistics still work, and I found it a very balanced view of the entire issue of DRM and copyright.
Feargal Sharkey Interview