You’re passionate about an issue and you want to take a stance. So, you gather up a bunch of students and organize a protest—a sit-in, a walk-out, a picket line, etc. But does the school have the power to shut it down? Aren’t these protests protected by the First Amendment? 

Because yearbooks aren't created to make profits, using song lyrics or a book quote in a yearbook ad would probably count as educational fair use, so it wouldn't violate copyright.