I know there are copyrights for books/movies, which I assume go same for the title names, but in general I do not fully understand where the line is because you do see names of movies and books from different decades or whatever that have the same name. I know sometimes they would get permission(especially in case of remakes) but what about just coincidences or where the plot has no resemblance. For example, I am about to have my book published and the name currently is 'Identity'. However when I google that, a 2003 movie with John Cusack was named that. So what are the rules here? Should I select a new name? Thank you for any help you can give me.