This is completely normal and does not belong to the scope of infringement. Infringement refers to the act of infringing on the legitimate rights and interests of others, and selling all your own things is not within its scope. After the seller sells something to you, you get the ownership of it and you can sell it legally. However, we must obtain the right to operate. If you operate something that is restricted in circulation by some countries without approval, it constitutes illegal operation. Moreover, taxes must be paid according to law. Failure to pay taxes at the purchase stage may constitute smuggling, and failure to pay taxes at the sales stage may constitute tax evasion.