Some copyright-conscious authors will add a "copyright statement" before and after their works when they are released, indicating that they have copyright in their works and are forbidden to reprint them at will. Legally speaking, this "copyright statement" has no definite effect and can only play a little role in self-authentication and deterrence of piracy. For example, if a person walks down the street with a bag on his back, and there is no "property declaration form" on the bag, most people will not take the things in the bag, because everyone defaults that the bag is not their own and can't take it casually. For a thief, whether there is a "property statement" or not, he will steal it, which will make the thief hesitate for a few seconds at most. It can be seen that the "copyright notice" does not have much effect. But I still encourage you to add this statement, even if it is to create more social atmosphere of respecting and protecting copyright, it is good.