There are no limits and no permissions required.
For example, as indicated above, an educator may show or perform any work related to the curriculum, regardless of the medium, in face-to-face classroom instruction. But there is still a considerable gap between what the statute authorizes for face-to-face teaching and for online education.
The TEACH Act of 2002, expanded the scope of online educators' rights to perform and display works and to make copies integral to such performances and displays, making the rights closer to those we have in face-to-face teaching. These rights are in Section 110(1) of the Copyright Act and apply to any work, regardless of the medium. Copyright law provides educators with a separate set of rights in addition to fair use, to display (show) and perform (show or play) others' works in the classroom.