"Fundamentally, copyright is a law that gives you ownership over the things you create. Be it a painting, a photograph, a poem or a novel, if you created it, you own it and it’s the copyright law itself that assures that ownership." Click on the link below to read about your rights if you are the owner of copyright.
If you don't own a piece of work, then you must acknowledge the person who created that work.
Creative Commons refers to a way of assigning a particular type of copyright liscense to a creative work or intellectual property, so that other people can legally reuse it, but within certain guidelines which the creator specifies.