Instruct: Given a premise, retrieve hypotheses that are entailed by the premise.
Query: Thereafter, in 1831, 1909, 1976, and 1998, and in numerous private copyright bills and temporary extensions of the copyright law and in repeated patent law revisions, Congress extended the terms of Federal copyright and patent protection of subsisting works.
The terms of Federal copyright 2 years prior to the 21st century 
There is judicial review on the subject of perpetual copyright. 
The 105th Congress was responsible for the 1790 copyright statute
Congress made a law to separate and help older copyright owners
Copyrights only last for a limited time.
Copyright laws continue to be a nuisance.
The Copyright Clause in the onstitution granted protection because there was an existing common law copyright.
Congress extended the term in the year nineteen hundred seventy one.
The statute was renewed
Congress extended the term less than 15 years ago.
that extension does not extend to all subsisting copyrights. 
The original copyright law was amended by the 105th congres
The Copyright Clause justifies the extension.
Copyrights lapse eventually.
perpetual copyright has value
You can not extend the copyright on something the day before it is set to expire.
The Copyright Clause involves more than just the writing of the work.
copyrights have their value for life.
Copyrights aren't intended to be ceaseless.
copyright laws have been around over 200 years
there is another event which also is about observance of when copyrights expire and works enter into the public domain. 
The Court opinion in Graham and in Feist ruled that Congress can permit restoration of films with a copyright.
Congress extended the terms of Federal copyright and patent protection of subsisting works in 1830.

Congress extended the terms of Federal copyright in a private copyright bill in 2003
Congress extended the terms of Federal copyright and patent protection of subsisting works in a single bill after 1998.
