The Copyright Law governs the making of reproductions of copyrighted works or materials as well as the circumvention of any technical protection measures for digitally produced works.
U.S. Copyright Office: Copyright Law of the United States
American Library Association. Copyright Issues
American Library Association. Distance Education and the TEACH Act
American Library Association. DMCA: The Digital Millennium Copyright Act
Association of Research Libraries. Copyright and Intellectual Property Policy
Library of Congress. United States Copyright Office. The Digital Millennium Copyright Act of 1998:U.S. Copyright Office Summary (pdf)
U. S. Copyright Office. Copyright Basics
U. S. Copyright Office. FAQs about Copyright
U. S. Copyright Office. Copyright and Digital Distance Education
U.S. Copyright Office: What Does Copyright Protect? (FAQ)
U. S. Copyright Office: Educational Video Series