In 1914, Chicago amended its film censorship ordinance, setting up a category of films approved for showing only to persons over twenty-one (the first example of a rating system in motion-picture exhibition). The police were authorized to give such films "pink permits".
In 1914, Chicago changed its film censorship rules by creating an age category for movies that could be shown only to individuals over twenty-one years old (the first instance of a motion-picture rating system). Police were authorized to provide these films with "pink permits".