What is Creative Commons?
Why Do We Have It?
But your probably thinking why don they just make it public, Well then they woundt make any money and/or no would would know who made it.
Creative commons allows this person to share there content with out have to give up complete control with 4 rules.
The 4 Restrictions
With Attribution you can use the content but you have to say who created it.
Second is No Derivative
You can use the content but you can't edit it or modify it in any way.
Third is No commercial
Which means you can use the content however you can not make money on it (retail it).
Forth is share alike
Share alike means that you can use/modify the content but if you try to share it you have to have the same Creative Commons Restrictions.