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Copyright is automatically owned. 'Registering' a copyright simply adds it to a searchable database, which has several advantages like being able to prove ownership of the copyright in case of a dispute. However, a work is only public domain if the copyright owner specifically declares it as such.
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".
No; it was written in 1872, and is in the public domain. Only the Vaughan Williams setting of the tune is protected.
Nobody. It's public domain.
The song "I Dreamed About Mama," by Hank Williams Senior was released in 1946 and is still protected under copyright laws. It will not be public domain until 2041.
The words to the nursery rhyme are public domain, they do not belong to anyone. However a particular musical notation, or recorded example of the song, are copyright to their respective creators. So you can sing your own version, and that will be copyright to you. But anyone else's version will almost certainly still be covered by their copyright, unless they specifically yielded rights and made it public domain.
Neither Copyright nor Patent law protect domain names.
It would have a copyright. The story and cartoon is new and wouldn't be in the public domain yet.
When a copyright expires, the work enters the public domain. In the public domain, the work is no longer protected by copyright law, and anyone is free to use, reproduce, or modify it without permission or payment.
After copyright term has expired, materials enter the public domain.
None. you wouldn't copyright the copyright symbol, you would trademark it.