Materials of this sort have existed from the beginnings of duplicating technologies. World War II era blueprints exist of drawings of female nudes with their body parts labeled as if they were the parts of airplanes. With the widespread adoption of photocopying, amateur duplication of this sort of material became available to a much larger social base. Cartoons and other amateur materials were distributed in the workplace, usually in violation of managerial restrictions on the use of office supplies, and often in disregard of copyright law.