[casual_games] Sudoku

[James Baker - WDDG/Inferno]

I've got some questions about Sudoku.
 
Is Sudoku (the name and/or the game) copywrited or owned by anyone?  I
see a new Sudoku game about every other day... and I'm just waiting for
one of our clients to ask for a version.  And is there a public
algorithm to generate the puzzles, or are developers buying them from
some place?
 
Thanks!
 
James
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