The purpose of Copyright Law is to advance learning and innovation by protecting the creators of original intellectual works, both published and unpublished.
It is the professional obligation of educators to understand Copyright Law and Fair Use.
Please watch the entire video for elaboration on these topics.
"The distinction between what is fair use and what is infringement in a particular case will not always be clear or easily defined. There is no specific number of words, lines, or notes that may safely be taken without permission. Acknowledging the source of the copyrighted material does not substitute for obtaining permission."
You must evaluate all four criteria below to determine whether you can claim fair use of a copyrighted work.