This exemption allows instructors to perform or display copyrighted materials during face-to-face teaching activities.  For example, it is permissible to show a full-length motion picture in class as part of the classroom learning. Note, however, that this exemption does not permit copying or distributing a work -- only displaying or performing it during class time.  Also, as the title implies, this exemption applies only to in-person presentations.  It does not apply to distance learning or virtual classrooms.