So to complement the Free Software post. Just posting something on Creative Commons.  This relates to media such as Video, Audio and Documentation.
You get to choose how you give permission for something to be used. So you can allow your creation to be shared, modified, modified and shared, or if people can make money from this or not (non commercial). Some of the licenses are classed as Free Culture and offer the greatest freedom, cc0 (cc zero) offers the most.
As the video  explains, if you create something YOU own the rights to it, so therefore you are able to choose how others use it.