In order for anyone to benefit from the usage of online content today, they must fully comprehend that of the usage of such content. Even if they own it all, you must protect yourself and your rights to ownership if anything. That's where the usage of the Creative Commons licensing law, rules and official regulation comes into the picture.
The video on the left will help anyone to understand it all a bit more, and to clarify some of the mystery that may be behind it all. Hopefully you can learn a thing or two about it, but it does take some pretty intense research as well as hardwired experience of using such content to fully comprehend it all.