Yes indeed Kradovech, it's all based on PR, since you need PR to play Project Normandy, you guys didn't read the first post?
The only "codes" you cant use is Python, because they are encrypted. All .tweak codes are yours to take, they belong to EA, not PR... A mod's content that is created with the engine does not belong to the mod, it belongs to EA, and EA allow modders to use it.
Only thing that mods "own" is models, sounds, textures. The rest is "free" to use. So go ahead and take .tweak codes and how objects work, from FH2 or PR or anyother mod you want.
Start ripping Models, Sounds or Textures, and there will be problems.