Although the students press the "start" button to make a copy of a coursepack, the copyshop is the "source of the reproduction" supplying a master copy of the coursepack, equipment and staff assistance.  This is vastly different, says the court, from a scenario in which a student gets a coursepack from a friend and steps into a copyshop to duplicate.  Short work is made of the Fair Use analysis: 
Purpose is commercial (it's the copyshop's purpose, not the student's)
Nature - creative
Amount - MDS case cited, showing that professors tend to choose qualitatively important material
Market - adverse impact because the copyshop can undercut competing shops that pay royalty fees
Blackwell Publishing v Miller at



http://docs.justia.com/cases/federal/district-courts/michigan/miedce/2:2007cv12731/222190/54/