RE Four years later Einhorn was involved in a more genuine controversy with the producers of Nancy McClernan s play Tam Lin which resulted in legal action 8 The controversy began when Edward Einhorn registered a derivative copyright on what he called a blocking and choreography script completely without my authorization after he had a fee dispute with my production partner A year later when I produced my play TAM LIN he sued me on the basis that I was violating his unauthorized derivative copyright The Dramatists Guild published my article on the case The Strange Case of Edward Einhorn v Mergatroyd Productions in its September October 2006 edition of The Dramatist