I want to know the answer to the following question:
Warner Bros. pictures before what year are part of the Turner Entertainment library?
All the background I'm provided with is that "Historically, the channel's programming consisted mainly of featured classic theatrically released feature films from the Turner Entertainment film library – which comprises films from Warner Bros. Pictures (covering films released before 1950) and Metro-Goldwyn-Mayer (covering films released before May 1986).". Is that enough to answer the question?