Difficult. To obtain national patent certification for teaching aids, it is necessary to comply with relevant legal provisions. If a party applies for a design or utility model patent, the approval process includes acceptance, preliminary examination, publication, substantive examination, and authorization. For an invention patent, the approval process includes acceptance, preliminary examination, and publication. , authorization. The steps are cumbersome and complex, so it is quite difficult to obtain national patent certification for teaching aids. National patent rights are subject to certain time and space restrictions, that is, the protection time in the country where the patent is applied for is limited, and it is not permanent protection.