In the US it isn't the sweat of the brow, but rather a minimal threshold of human creativity.
https://en.wikipedia.org/wiki/Sweat_of_the_brow
https://en.wikipedia.org/wiki/Copyright_law_of_the_United_St...
https://en.wikipedia.org/wiki/Sweat_of_the_brow
https://en.wikipedia.org/wiki/Copyright_law_of_the_United_St...