How come this hasn't been sued?

Does ubisoft own any copyrights to this material in this share/project? I want to use this as a starting point for a game (I’ll open GPL parts that integrate with it (I.E. client side logic)) but I need to know if I need to work out anything with them before publishing. Thanks!

Now I understand. Saw the little tidbit about needing the original data files. Destroys my idea. O well.

Original game assets are needed to make VCMI works as original H3. However, it is theoretically possible to build completely new game upon VCMI engine. Such open-source initiatives were already proposed in the past. By design, VCMI is not dependent on H3 data files.