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Copyright is the legal right to be the only entity able to reproduce, sell, or copy a work. It covers both published and unpublished works.
Copyright does not cover facts, ideas, systems, or methods, but it may cover the way the information is shared. For example, the facts in an encyclopedia are not under copyright, but the text of an entry is.
NOTE: Copyright does not require a formal application or any kind of notice. Copyright is in effect as soon as the work is created as soon as an original work is put into a fixed medium. If something is original, it is likely copyrighted!