The four factors used to determine whether the use of a work is fair use (purpose, nature, amount, effect) form the structure of this checklist. Congress and courts have offered some insight into the ...

Whether or not a use counts as "fair" is determined on a case by case basis by four factors: The purpose and character of one’s use The nature of the copyrighted work The amount and substantiality of ...

Dan Cahoy, a Professor of Business Law at Penn State’s Smeal College of Business, states, "Ultimately, there are four broad and somewhat amorphous factors to determine fair use: the purpose and ...