Wikipedia:Free content

The use of free content on Wikipedia:
 * Wikipedia is free content - an explanation of the third pillar of Wikipedia
 * Copyrights – Wikipedia policy about copyright issues
 * Public domain – guideline about how the public domain applies to Wikipedia
 * Adding open license text to Wikipedia - about how to use free content from other sources within Wikipedia
 * The Free Encyclopedia – essay about how copyleft is used to provide a collaboration framework for Wikipedia
 * WikiProject Images and Media/Free – Wikiproject with the aim of spreading the use of free images in Wikipedia