Reasons for trademark registration. "C-store" is one of the convenience store brands, which is more common in Shanghai. C-store is a transliteration of English. According to the official inquiry of Christie's, there are problems in the registration of Guangzhou, which leads to the registered trademark of Christie's being Xiduoduo. Registered trademark is a legal term, which refers to a trademark approved and registered by the relevant government departments, and the trademark applicant obtains the exclusive right to use the trademark.