on NonFiction Authors Association:
If you have written or are writing a nonfiction book, you likely have come across text belonging to a third party and have asked yourself: “Can I use it?”
If you obtain permission from the third party to use the text (or if it’s in the public domain), then of course you can use it.
But what if you don’t ask for permission? Do you have any defenses to a copyright infringement lawsuit?
One such defense is if your use is a fair use.
While not a substitute for legal advice, below is information to give you a better understanding of the fair use doctrine and how that may apply to your nonfiction project.