As long as you give credit to Ironclad and Stardock Games as a copyright, I'm pretty
sure you can bring stuff in and out to other games. Most mods don't need a consent from
the game developers (can you imagine the pain) to export stuff into other games or modify
their models/textures/sounds ect ect. Generally, if they release a SDK for their game,
they are giving you permission to do whatever you want with the game.
The only thing you need absolute consent for is modifying other people's work and
putting it back into the community. Universally its frowned upon to take credit for
other people's hard work which you would have made very minor alterations compared
to the actual work it took to bring the mod into the game itself. Its also just an act
of courtesy to ask the creator of the mod permission for you to release the mod. If you
edited the mod and just kept it on your computer, thats fine, but never release it in
the community unless you give proper credit to the author. Some modders require you to
contact them personally to get permission, others just ask for credit if you mod it. So
its just best to read the readme file that came with the mod itself.
I'm not sure if this community agrees with this method or not (I'd ask the veterans of the
community first), but if the person who requires personal contact (IM Messenger, email ect
ect), has been inactive in the community for an extended period of time (given that you
tried all you could to contact him of course), it is almost okay to just go ahead and
modify his or her own work. Why? Because its a bit stupid to ask people to get permission
from you, then go inactive (for whatever reason), for a few years or so (when the
community is buzzing with activity). My own community (Star Trek Bridge Commander) agrees
with this idea, but you should ask some of the more experienced people about this before
attempting to do anything like what I'm suggesting.
Sorry for the long post lol. I just wanted people to make sure they know what they can and
can't do with mods. I hope this can help some people. I also know this post is a month
old, but I felt like I should get this across.