Fair use allows people to share copyrighted material without express permission from the owner. Instances in which fair use is permitted include commenting, criticism, teaching, journalistic reporting, and research. The line can be blurred between fair use and copyright infringement. However, there are determining factors in place, including whether the material has been used for profit, the amount of the material used (in relation to its entirety), and any damage is done to the profit-making potential of the original work.