According to the rule, the need to copy should occur closely in time to the need to use the copies. This is often referred to as the one semester rule. If you use something for one semester only it is likely to be seen as fair use. If you use something repeatedly, it is less likely to be considered fair use. The expectation is that you will obtain permission as soon as possible. Using something over a period of years is not within the spirit of the guideline.
The use of any copies should be for one course at one school.
The copies should include a notice of copyright acknowledging the author of the work.Special works:
NOTE: It is recommended that teachers, faculty, or instructors consider both the special guidelines for instructor and take into account the four factors that are used to evaluate fair use when they are deciding what and how much of a copyrighted work to use.