Technology, Education and Copyright Harmonization Act of 2002 (TEACH Act)
Amended 110(2) of the Copyright Law and is intended to facilitate the use of copyrighted materials, without permission, in asynchronous, web-based distance educational settings.
Sample Copyright Notice
"The materials on this course web site are only for the use of students enrolled in this course for purposes associated with this course and may not be retained or further disseminated."
You might consider adding this notice to your Moodle course pages where you've posted copyrighted resources. While not strictly necessary, it is a sign of good faith and a helpful reminder to students of their responsibilities.