"There are some ideas that are broken, but attractive enough to some people that they are doomed to be tried again and again. DRM is one of them."
Mark Shuttleworth (of Ubuntu Fame) writes on his personal blog recently about the futility of DRM specifically focusing on video. It is a well written piece that should be mandatory for anyone working in the content industry.

In summary, information wants to be free, and "Face it, people either want to pay you for your content, or they don’t, and your best strategy is to make it as easy as possible for people who want to comply with the law to do so."
Read the posting for more...
You can also Digg Shuttelworth's post