Breaking the law. Putting up Trader Joe's logo in a ballroom (referring to the unauthorized use of another person's trademark) may constitute an infringement because it may infringe on the rights of the trademark holder. A trademark is a specific designation used to identify the source of specific goods or services and enjoys legal protection. Unauthorized use of someone else's trademark may lead to legal disputes, and the trademark holder has the right to take legal measures to safeguard its rights and interests.