Exploring Other Open Licenses

It is important to understand that Creative Commons is not the only type of openly-licensed content.

Yes, Creative Commons is the open license that popularized open educational resources, but a resource can be OER without carrying a Creative Commons license.

OER can come in at least 3 other forms:

GNU License Suite

Image of GNU License

GNU is an organization sponsored by the Free Software Academy; GNU has produced a number of licenses relating to software. Some web material you may come across make use of the following:

GPL – GNU’s General Public License is used for many software packages, as well as other items. Under this license, materials can be copied and distributed verbatim, but cannot be changed in any way.

GFDL – The GNU Free Documentation License is a form of copyleft intended for use on a manual, textbook or other documents. Under this license, materials can be copied and redistributed with or without modifications, either commercially or non-commercially.

Explore more: GNU Operating System

Public Domain

Simply stated, public domain works are works that are copyright free.  No one owns the copyright.

There are two types of specific works that fall under this category.  The first are works that never had copyright to begin with such as all items created by the U.S. federal government. The second group refers to those works whose copyright has run out.

The law acknowledges that while copyright is important to the original creator, knowledge is built upon and should not be restricted forever.  Generally speaking, items that have a U.S. copyright date before 1923 are no longer supported by the “all rights reserved” elements of copyright law. Generally speaking, copyright is extended to 75 years from the death of the author, so recent works will not be in the public domain for many years.  There are, of course, some exceptions to the rules.

Watch this fascinating video about Public Domain works from Jennifer Jenkins, Duke University School of Law.



If you want more information about such exceptions, a great resource is found at the Cornell University Library Copyright Information Center (https://copyright.cornell.edu/publicdomain)

Government-Produced Resources

Broadly speaking, most content found on .gov websites is public domain. Examples of good government-produced OER are the National Institute of Health’s Toxicology Tutor and NASA’s Historical Studies in the Societal Impact of Spaceflight textbook.

Look closely at .gov content, however. Sometimes the materials hosted there have been contracted out or developed in partnership with a company or organization, and in these cases, a traditional, all rights reserved copyright may be present.


The content of this course is adapted from the following works:


Creative Commons CC BY License ImageUnless otherwise noted, this work is licensed under a
Creative Commons Attribution 4.0 International License.