The US Constitution ~ 1790
The Congress shall have Power ... To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries. United States Constitution, Article I, Section 8
COPYRIGHT is a legal right created by the law, that grants the creator of an original work exclusive rights to its use and sharing:
Copyright Fair Use in schools
Copyright Rules - copyrightkids
Selfies - who has the copyright?
WHO OWNS PHOTOS?