There are a lot of pedagogical and technical issues that make the shift from in-person to online teaching challenging, but for once, copyright is not a big additional area of worry! Most of the legal issues are the same in both contexts. If it was okay to do in class, it is often okay to do online, especially when your online access is limited to the same enrolled students.
Copyright law is complicated. This guide is intended to provide you with some guidance on how to refer library users to accurate information. However, this guide is not intended to provide legal advice to Professors or library users.