Illegal. According to People's Republic of China (PRC) Copyright Law, People's Republic of China (PRC) Trademark Law and other relevant laws and regulations, works and trademarks created by others enjoy independent intellectual property rights, and any unauthorized use, reproduction and dissemination may infringe upon the legitimate rights and interests of intellectual property rights holders. Therefore, if you add other people's goods to your own commodity library without authorization or permission, it may constitute intellectual property infringement and you should bear corresponding legal responsibilities.