Supreme Court of the United States, Jack Daniel's Properties v. VIP Products (2023)
“ The Lanham Act also creates a federal cause of action for trademark infringement. In the typical case, the owner of a mark sues someone using a mark that closely resembles its own. The court must decide whether the defendant’s use is “likely to cause confusion, or to cause mistake, or to deceive.” §§1114 (1) (A) , 1125 (a) (1) (A) . The “keystone” in that statutory standard is “likelihood of confusion.” See 4 McCarthy §23:1. And the single type of confusion most commonly in trademark law’s sights is confusion “about the source of a product or service.” ”
