Help me find the title of a documentary I was told about at a sci/fi festival

A few months ago I went to the Music Box's Sci/Fi film festival. There were numerous horror/sci fi movies for sale. One of them was apparently a documentary about a college professor who made some sort of torture/ sex film and was subsequently prosecuted and put in prison for making the film. Does anyone know what this movie may have been? Or at least know the professor the film features?