Quote:
Originally Posted by Ralph Sir Edward
Correction:
1976: life+50 or 75 years for corporate works
1998: life+70 or 95 years for corporate works
Should read:
1976: life+50 or 75 years for all works under copyright at the time of enactment
1998: life+70 or 95 years for all works under copyright at the time of enactment
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You can add the info about existing works, but my summary was accurate as far as it went.
And if you really want to address the changes to existing work copyright length, it gets extremely complicated.
For example, something written before 1978, but published between 1978 and 2002 is in copyright in the US for of 70 years after the author's death or 31st December 2047, whichever is longer. (There's going to be lots of posthumously published stuff coming into the public domain in the US on 1st January 2048!)