This is incorrect. In the US new copyright is only awarded for acts of authorship. Minor spelling or punctuation changes, or typo fixes, are not authorship. See

This is incorrect. In the US new copyright is only awarded for acts of authorship. Minor spelling or punctuation changes, or typo fixes, are not authorship. See https://en.wikipedia.org/wiki/Sweat_of_the_brow https://en.wikipedia.org/wiki/Sweat_of_the_brow