Is the call for papers copyrighted?

Yes In the essay, treaties such as copyright transfer, modification right, abridgement right and signature right are stated. The essay notice of a periodical clearly reads: "This magazine enjoys exclusive Chinese publishing rights and electronic publishing rights for its published works. Please do not submit more than one manuscript. Because the essay is aimed at an unspecified subject and its content is simple, it is usually an invitation to offer in law and cannot constitute an offer.