This long but common sense article outlines some of the basic concepts and reasons for and against DRM
http://www.securityfocus.com/columnists/390DRM has wormed its way into the imaginations of Hollywood, the RIAA, and publishers, and they in turn have convinced the computer industry (who, it must be admitted, needed little convincing) that DRM must be applied and supported throughout their products. To The New Yorker, I'm sure that DRM made lots of sense. In reality, though, it doesn't. DRM has angered this customer (and many others), eviscerated my Fair Use rights, ultimately rendered the money I spent moot, and it can still be copied anyway! Where does that leave the publisher? It sounds to me like we were both - consumer and publisher - sold a bill of goods. Welcome to the future!
Its always nice when other users come up against the media mafias dirty tricks and expose them for the creeping theives they are stealing not only from the original creators but the consumer also, when will this global rip-off end ?