First of all, it depends on whether the second-hand goods themselves are infringing. If there is, the seller's sales behavior will generally infringe, only that it will generally infringe, because if the seller does not know and the seller's goods are obtained from public channels after paying reasonable consideration, then the seller may not infringe. If the buyer buys an infringing patented product, he will be responsible for stopping the infringement according to the provisions of the patent law. If he buys a product that infringes trademark rights and copyrights, as long as it is for his own use, it generally does not constitute infringement.