jan 1, 1998 - 1998: Sonny Bono Copyright Term Extension Act
The law extended protection from life of the author plus fifty years to life of the author plus seventy years. An exception permits libraries, archives, and non-profit educational institutions to treat copyrighted works in their last twenty years of protection as if they were in the public domain for non-commercial purposes, under certain limited conditions.
Added to timeline:
This is a timeline of some important dates in Copyright Laws...