Some time ago I started to develop a 'Sudoku Solver' using Python. Of course, there are many Sudoku solvers already available as open source projects, but I did not want to use any of those, because I was looking for a 'just for fun' project. Therefore, I start the development of a 'Sudoku Solver', just to see how it goes. I needed some data to test my program, therefore I searched the web, and I found plenty of Sudoku games, publicly available, free to solve, but from the copyright point of view 'All Rights Reserved'. I also used some free Sudoku games available on Android. The development went pretty well, and I successfully found solutions for both classic Sudoku and for a plethora of Sudoku variants, for which I could not found existing open source solvers available. Now I am considering to share the code for the Sudoku solvers as open source software, most likely using a permissive license like MIT, which means the code can be used for commercial purposes. The Sudoku games (All Rights Reserved) I used during development as test data, from a multitude of public sources and authors, will not be incorporated into the public project.
In doing so, am I infringing the copyright of Sudoku authors somehow?