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Copyright

The exclusive right, granted by law for a certain number of years, to make and dispose of copies of a literary, musical or artistic work. In the United States the copyright is granted for the life of the author plus 50 years. In the case of a joint work, it is for the life of the last joint author to die, plus 50 years. In either case the copyright runs until the end of the calendar year 50 years after the author's death. (Random House College Dictionary, rev ed; Strong, W.S.: The Copyright Book: a Practical Guide, 1981)