A work that incorporates to some degree another work that is already protected by copyright. The producer of the derivation can only copyright the portion that is not already copyrighted. Examples include: language translations, rendering of an original work in another medium.
The Digital Millennium Copyright Act (DMCA)
The DMCA became federal law in 2000. A complicated piece of legislation which updated the Copyright Code of the U.S., it addressed among other issues the creation of archival copies of digital works, non-circumvention of technology protections, and compliance with international copyright agreements.
Public domain is a status that a created work can have that does not have copyright protection because it doesn’t comply or has fallen out of protection. Works in the public domain may be used freely. Don’t forget to cite your source!
The Technology, Education and Copyright Harmonization Act (TEACH Act) became federal law in 2002. It updated Section 110(2) of the Copyright Code to accommodate the electronic needs of distance education.
Read TEACH Act (SEC. 13301. EDUCATIONAL USE COPYRIGHT EXEMPTION) text at copyright.gov.
work made for hire
A work produced as a function of the producer’s employment. Instead of the producer being the copyright holder, the employer is. A negotiated agreement may give the producer copyrights.