At one point, there was a concern about legality. It hasn't been investigated again since that point, as I've been a bit busy with Realm Works.
I'll strive to make the time to re-evaluate it, but I'm up to my eyeballs right now, so no promises.
As for whether it's Wizards or Hasbro lawyers, it's not really important. Wizards has their own legal team that would probably be more than adequate to deal with any IP concerns. Only if they ran into difficulties would they bring in the howitzers from Hasbro legal. I don't want to be staring down the barrel of an AK-47, let alone a howitzer.