The next real copyright battle will occur in 2042. The main driver of copyright lengthening is not publishers, but Hollywood. In the 1998 Sonny Bono Act (AKA the Mickey Mouse Preservation Act), print copyright was extended to 95 years, (for works before 1978) or printed works, but extended to 120 years for motion pictures and other video recordings!
So Hollywood doesn't have to worry about any sound video recordings until the 2049. (Except those that accidentally fell into the US Public Domain due to copyright not being renewed from 1923 to 1976.)
Every copyright extension since 1909 has been driven by Hollywood. (Otherwise every movie and TV show from 1962 and prior would be in the Public Domain.)
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