Patent infringement in China: finding the source

Article 70 of the Chinese Patent Law, which came into effect on October 1, 2009, reads: “Any person who, for production and business purpose uses, offers to sell or sells a patent-infringing product without knowing that it was made and sold without the authorisation of the patentee, shall not be liable to compensate for the damage of the patentee if he can prove that he obtained the product from a legitimate channel.”