A copyright is a law that gives the owner of a written document, video, composition, book, picture, or other creative work, the right to decide what other people can do with it.
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Copyright laws make it easier for authors to make money by selling their works. Because of copyright, a work can only be copied if the owner of the copyright gives permission.
When someone copies or edits a work that is protected under copyright without permission, the owner may sue for the value of the violation.
Read more: https://simple.wikipedia.org/wiki/Copyright