Blizzard kills anything that gets too much attention and contains assets from their games, not long time ago there was a Starcraft clone in HTML, it contained assets taken directly from the game in PNG format, guess what happened!.
I don't think you'll have problems with this one, but if you're too concerned, you can provide a tool that extracts the assets from the game, so you are not distributing the assets directly with your package.
-Mortos