The Court recognized that "there are differences between the copyright statute and the patent statute, and the purpose to decide the question now before us was expressly disclaimed" in "Bobbs–Merrill". Nonetheless, "it is apparent that, in the respect involved in the present inquiry, there is a strong similarity between and identity of purpose in the two statutes." Both statutes grant an exclusive right to "vend." There is no difference of importance in the respective legal rights to vend books and vend products: