Yes, but you must register first. Wu Dalang sesame seed cake is a trademark. If you want to use it as your own signboard, you need to register the trademark first and obtain the right to use the trademark. Trademark registration needs to comply with relevant laws and regulations, including the requirements of independence, distinctiveness and distinctiveness of trademarks. If your trademark meets the relevant regulations and has obtained the trademark registration certificate, then you can legally use the trademark as your signboard.