Examples of Copylefted Material:

1.The Communist Manifesto, by Karl Marx: Copyleft: Marxists Internet Archive (marxists.org) 1987, 2000, 2010. Permission is granted to

distribute this document under the terms of the Creative Commons Attribution-Share-Alike License. (https://www.marxists.org/archive/marx/works/download/pdf/Manifesto.pdf)

2. http://sourceforge.net/ contains a large variety of computer software that has been CopyLefted to constitute as free software (http://e107copyleft.blogspot.com/p/examples-of-copyleft.html)

3. Girl Talk is an artist who samples audio tracks from popular songs as well as vocal tracks and remixes the two together to form new songs under the 'fair usage' rights of CopyLeft.(http://e107copyleft.blogspot.com/p/examples-of-copyleft.html)