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Palmer Cox was born on 1840-04-28.
Palmer Cox died on 1924-07-24.
No; as a Canadian, his works entered the public domain in 1975.
Yes; as a Canadian, his works were only protected for 50 years after his death.
One of them is Terry Farrell, of Star Trek: Deep Space Nine fame. And I had heard, but cannot confirm that another is Courtney Cox.