The vast majority of pre-release music that finds its way to file sharing networks can be attributed to the duplication of promotional copies handed out to the media in order to create early buzz (or boredom) via music publication reviews. Epic Records Group has devised a very low tech solution to this problem: distributing the promotional copies within a glued shut Sony Walkman, with headphones glued into the jack to prevent copying. (Also see this NY Times story, reg. required) The move speaks volumes about the state of modern copy protection.