Relationship and difference between fair use and exhaustion principle and non-commercial use in trademark law

Fair use refers to very commercial and non-profit use, as well as the use for research and news reporting as stipulated by laws and regulations.

The patent law stipulates the principle of exhaustion, which refers to the use of the buyer.

Non-commercial use is restricted to a certain extent. Self-use or research use does not produce economic benefits and does not harm the interests of the obligee.