Patent licensing, also known as patent licensing trade, refers to that the owner of patented technology or his authorized person permits others to exploit the patents owned by him in a certain way within a certain period of time and in a certain area, and collects royalties from others. Patent license only transfers the right to use the patented technology, the transferor still owns the patent, and the transferee only has the right to exploit the patented technology, but not the patent ownership. Patent licensing is a kind of licensing trade that allows licensees to use their patents within a certain range by concluding a patent licensing contract and paying royalties.