The Higher People’s Court of Beijing Municipality ruled in October that the “Di-Di-Di-Di-Di-Di” notification (通知) sound on instant messaging service QQ could receive its own trademark, reported Sixth Tone. The result came after years of legal battle. In 2014, Trademark Review and Adjudication Board (TRAB) turned down an application from Tencent to register (注册) the sound. The Board said the sound was “simple and common”. In 2016, Tencent sued (诉讼) TRAB for its decision. It’s the country’s first sound trademark lawsuit (诉讼案件).