Infringement but not liable for damages does not mean that no liability is assumed. If this is the case, the infringement must be stopped. 1. If you use or sell for production and business purposes a patented product that is not known to be manufactured and sold without the permission of the patentee, or a product directly obtained according to a patented method, and you can prove the legal source of the product, you will not be liable for compensation. The so-called "legal source" means that the user or seller purchases from others through legal purchase channels, normal sales contracts and reasonable prices. 2. You still have to bear the legal responsibility to stop the infringement. That is to say, a person who sells patent infringing products in good faith shall not sell any more products from the moment he learns that the products he sells are infringing products, otherwise it will constitute an infringement.