The copywrite law is the legal right given to original creators, giving them legal rights to their work. Using works that are copyrighted are not allowed. Look for copyright notices on works, and waterworks on images. Fair use is the legal doctrine that allows freedom of expression by permitting the unlicensed use of protected works in certain circumstances. This means students are allowed the right to public, copyrighted material under the permission of the teacher.
Here are two websites to better understand copywrite and fair use.
https://scriptwritersnetwork.com/registering-your-script-copyright-protection/
https://scriptwritersnetwork.com/registering-your-script-copyright-protection/