Ritter Sport Keeps Square Chocolate Trademark in Legal Fight With Milka | Eater

"A German chocolate maker credited with popularizing the square-bar format—reportedly chosen so bars would fit into jacket pockets—registered that distinctive square shape with the German patent office and has successfully defended it in court. After a legal battle with a rival (Milka) over producing square bars, judges upheld the trademark on the grounds that consumers view the square form as an indicator of origin and quality and found no artistic necessity for the competitor to copy the shape, effectively barring other top-brand makers from marketing square chocolate." - Jaya Saxena