https://www.si.edu/openaccess/faq
This site includes more than 4 million digitized items and data from the Smithsonian’s museums, research centers, libraries and archives. These items are open for public use under a Creative Commons License 0 that puts this items into the Public Domain.
https://www.sahistory.org.za/policy
This site includes articles, images, videos and other items either created by SAHO researchers and contributors, or collected by the site. Some materials are in the Public Domain, others are under a Creative Commons License, and there are also materials protected under Copyright.
https://archive.org/details/prelinger?tab=collection
https://archive.org/details/prelinger
This site includes digitized copies from film, particularly home movies, amateur films and industrial films. According to the Rights Statement the collection includes materials that are licensed under a Creative Commons Public Domain license. It also contains materials that do not carry a Creative Commons License. Users are encouraged to contact the archive to seek further information on how to secure permission for use. In addition, description, synopses and other text and metadata provided by the archives is copyrighted by the Prelinger Archives and Getty Images.
https://www.getty.edu/legal/copyright.html#cc
This site includes digitized images of art works, particularly paintings, ceramics, sculptures, and photographs included in the Getty Museum Collection. The collection includes art pieces from ancient to modern times. According to the Terms of Use of the Museum, a large number of the art images are in the public domain, and this is clearly stated in the Rights Statement of every piece. Some of the more recent materials are under Copyright. The site also provides access to descriptions of the art, text for exhibits and Getty publications. These are described as “Site Content” and are, for the most part, under a Creative Commons License.