I have recently learned how to do constraint processing and I figured out how to generate sudoku puzzles. I thought it would be interesting/fun to create an interactive website for these puzzles. I was planning on doing this just for fun and if I discover a way of monetizing it, that's bonus!
Anyway, I have a concern about copyright issues. WebSudoku, which has billions upon billions of sudokus apparently has them all copyright protected. Can they do this? If I am able to generate my puzzles with programs that I wrote and they happen to match puzzles on that site, am I violating the copyright protection?