A Philadelphia theatre tries to mount an all-female production of “Grease” but the musical’s creators object. So “how much control does a creator retain after releasing a play for production? When does a director’s interpretation override an author’s intention? There is a “strong presumption” in the theater community to protect the intentions of the playwright, and that outrageous staging could be framed as a copyright violation. Whether a court would side with the playwright or the producer in such a case is uncertain, because almost no cease-and-desist letters result in court action.”