Fair Use of Copyright
"A picture is worth a thousand words"
Attribution in copyright, is acknowledgement as credit to the copyright holder of a work.
Creative Commons License
Creative Commons License is one of the several public copyright license that enabled the free distribution of an otherwise copyrighted work.
Public Domain is those whose exclusive intellectual property rights have expired, have been forfeited, or are inapplicable.
Fair use is any copying of copyrighted material done for a limited and "transformative" purpose, such as to comment upon, criticize, or parody a copyrighted work.
Copyright is the exclusive legal right, given to an originator or an assignee to print, to publish, etc.
Digital Citizenship refers to a person utilizing information technology in order to engage in society, polotics, and government participation.
How do know if an online image is copyrighted
The online image is copyrighted as soon as it is created. Though in the US, if you want to sue someone for copyright infringement, you usually have to have applied for an official copyright if you hope you recover damages.