1).  When using someone else's work you should check who owns it, Get permission to use it, Give credit to the creator, Buy it (is necessary), and make sure to use it responsibly. When using someone's work you may want to think of it as how would you feel if someone used your work for there own need with out asking you.


2). I would use Creative Commons. I would be fine with people it using it as long as people using it gave me credit for it. Since some times people do need help with there work and I am willing to help as long as they thank me or give me credit for it.