That depends on the country. In the United States, copyright doesn’t even need the written phrase, and hasn’t for decades. You don’t have to formally send it to the copyright office or Library of Congress to have copyright protection. And any signatories to the Berne Convention or other treaties wherein copyright was upheld in other countries will (generally) treat it that way too.
On the other hand, non-signatory countries like China don’t really care, and piracy is beyond rife and straight into “that looks cool. Make a thousand and sell them for 20 Yuan!” And nothing Japan or Wizards of the Coast does will stem that tide.