Images created today automatically have copyright protection. You cannot assume you have permission to use images that have been posted on the Internet, even for educational or non-commercial purposes.
When using images, you need to ask the same questions you would for any other copyrighted work:
Owners of copyrighted images sometimes give permission to use these images through licenses.
Images without copyright protection are in the public domain, ususally because the copyright has expired or the image was created by the U.S. government.
Meet with a research librarian to discuss a copyright question.
This site is intended for informational purposes only. Library staff members cannot give legal advice. For legal advice, you should contact an intellectual property attorney.