Federico Bruni bruni@fsfe.org writes:
It seems that there's no particular reason behind this requirement. The organizers haven't explained why other programs are not allowed. Probably, they will publish the score of the winner and they want to be sure that the source is made by the software used by the big publishing companies.
My guess is that they only know these two programs well. But again, you better ask. You might get better answers if you attach a screencast that illustrates how you can do the task with your free software program :-)