Under some jurisdictions (eg Germany), I'm not sure whether the output of a program is copyrightable at all.
Your software, yes, but probably not the output.
I'd argue that if I wrote a program to generate a novel, that novel should be copyrightable.
OTOH one could argue that the maze itself does not fall under the scope of the Urheberrechtsgesetz because its threshold of originality is too low (no offense, it is after all auto-generated). But I'm no lawyer and this is just a spooky idea.