"The exclusive legal right to reproduce, publish, sell, or distribute the matter and form of something (such as a literary, musical, or artistic work)"
Copyright (n.d.). In Merriam Webster Online, Retrieved May 22, 2019, from https://www.merriam-webster.com/dictionary/copyright.
It is important to follow copyright law when using material other than the professor's personal material in an online class (or face to face classes). How does one know what and how to use material? This guide should help.
In a nutshell:
See the remainder of this guide for more specifics on the TEACH Act, Fair Use and Creative Commons Licenses.