1998 : Sonny Bono Corporation Copyright Term Extension Act
"The Act extends extant copyrights by 20 years, subject to a new exception which, under limited circumstances, permits educational copying within the final 20 years."
This Act meant that copyright in the US was extended an extra 20 years to the life of the creator PLUS 70 years - and applied to both new & existing works
We have a massive system to regulate creativity. A massive system of lawyers regulating creativity as copyright law has expanded in unrecognisable forms, going from a regulation of publishing to a regulation of copying - Lawrence Lessig