(a) you hold the copyright
(b) you have received permission to scan from the copyright holder (if the students and faculty of the university already has access to the material, then permission may already exist, please check with the library)
(c) copyright protection has expired or never did apply (i.e., items in the public domain)
(d) the material is open access material (it was published in open access publications, works placed in Institutional Repositories or other repositories such as www.cnx.org and works under Creative Commons licenses)
(e) the material is part of the Access Copyright repertoire and no more than 10 percent (20 percent if the scan is placed in Moodle) of a book is scanned