Before you upload an image, make sure that the image falls in one of the four categories:
Own work: You own all rights to the image, usually meaning that you created it entirely yourself.
Freely licensed: The image has been released under an acceptable free license.
Public domain: The image is in the public domain, i.e. free of all copyrights.
Fair use:Fair use is a limitation and exception to the exclusive right granted by copyright law to the author of a creative work. In United States copyright law, fair use is a doctrine that permits limited use of copyrighted material without acquiring permission from the rights holders. Examples of fair use include commentary, search engines, criticism, parody, news reporting, research, teaching, library archiving and scholarship. It provides for the legal, unlicensed citation or incorporation of copyrighted material in another author's work under a four-factor balancing test.
Definition of Fair use taken from Wikipedia. Retrieved March 25, 2018, from http://en.wikipedia.org/wiki/Fair_use