Copyright is the ability to keep ownership over an item and to make a profit on it, without other people, besides the owner(s), to use it. There is a way around this though. It is called the Fair Use Policy. The Fair Use Policy is the ability to use copyrighted work, without the permission of the owner. Some ways the use it are in school, parodies, etc.
A regular copyright lasts until the owner dies, plus 70 years. If you do copyright it, YOU WILL HAVE TO PAY.