This sign was apparent seen on the Indiana University–Purdue University Indianapolis campus. 

What’s going on here?

Is Purdue taking a stand against the miserable treatment of free speech on so many other campuses? Is this a student prank? Is it satire? Should we find it depressing or encouraging? If it is the work of students, will Purdue remove it? If it is a statement by the school, will students or faculty protest?