The Technology, Education, and Copyright Harmonization (TEACH) Act of 2002 (Public Law 107-273 p. 154-157) clarifies what uses are permitted with regard to distance education and outlines what requirements IT staff and students of a university must abide by in order to be in compliance with the TEACH Act.
The Act permits teachers and students of accredited, non-profit educational institutions to transmit performances and displays of copyrighted works as part of a course if certain conditions are met.
The easiest way to determine if a work can be used in an online class or as part of a distance education program is to consult a TEACH Act Checklist for every individual work.
The TEACH Act does not contain language that requires a copyright notice, but standard language should be appropriate:
"The materials provided on this course website are only for the use of students enrolled in this course for purposes associated with this course and may not be retained for further disseminated."