Public domain, for more than a century. What could still be protected is a modern arrangement.
Both the song and music are so old that copyright law does not cover them.
Copyright law varies from country to country; in the USA, any song published before 1922 is in the public domain. Mostly, the copyright survives until the composer(s) die and then for 75 years afterwards.
No; copyright is administered by St. Nicholas Music.
No, but a new work based on a PD song can be protected by copyright. A new translation, setting, arrangement, etc may be copyrightable. A common example would be the traditional Shaker song "Simple Gifts," which is in the public domain, and Aaron Copland's popular orchestral setting "Variations on a Shaker Melody," which is protected by copyright.
No; poetry and song lyrics written prior to 1923 are in the public domain.
It is Public Domain.
Key has been dead for 170 years, so it's long since been in the public domain.
Both the song and music are so old that copyright law does not cover them.
Both the song and music are so old that copyright law does not cover them.
Both the song and music are so old that copyright law does not cover them.
The song was originally put into the "public domain" so there is no copyright on the song itself. HOWEVER people who have recorded the song would own the mechanical and/or publishing rights, so for any specific recording of the song there will be a rightsholder.
No, it is in the public domain.
No one. It's in the public domain.
Works no longer protected by copyright are said to be in the public domain.
Pubic domain occurs naturally when a copyright expires. In theory, a copyright owner can intentionally disclaim any power to enforce a copyright, making it as if it were "public domain".
Nobody. It's public domain.
Neither Copyright nor Patent law protect domain names.