The initial purpose of Open Access is to enable researchers to make use of information already known to science as part of the published literature. One way to do that systematically is to publish scientific works under open licenses, in particular the Creative Commons Attribution License that is compatible with the stipulations of the Budapest Open Access Initiative and used by many Open Access journals. It allows for any form of sharing of the materials by anyone for any purpose, provided that the original source and the licensing terms are shared alongside. This opens the door for the incorporation of materials from Open Access sources into a multitude of contexts both within and outside traditional academic publishing, including blogs and wikis.
Amongst the most active reusers of Open Access content are Wikimedia projects like the over 280 Wikipedia, Wikispecies and their shared media repository, Wikimedia Commons. In the following, a few examples of reusing, revising, remixing and redistributing Open Access materials in the context of Wikimedia projects shall be highlighted.