Placing materials on reserve with the library allows a large number of students to view a reading assignment within a realitively short timespan.
Traditionally, students would access the reserved materials at the circulation desk in the library. The E-Reserves service at UIS allows you to duplicate this function electronically through Blackboard by placing a PDF or link to the readings in your course site for a period of time.
In 2002, Congress passed the TEACH Act.
"The TEACH Act expands the scope of educators' rights to perform and display works and to make the copies integral to such performances and displays for digital distance education, making the rights closer to those we have in face-to-face teaching. But there is still a considerable gap between what the statute authorizes for face-to-face teaching and for distance education.
Fair use is almost always going to be the best source of authority for making copies in any context, but especially in conjunction with statutes like 110(2) that give us specific authorization that may not be sufficient in a particular case."
(from http://www.utsystem.edu/ogc/intellectualproperty/teachact.htm)