Liscence Restrictions - Advice?

[Omega]

I could use some advice. I'm not much for understanding liscences. Could one use a model from a free open source game like Nexiuz and UFOAI (alien invasion). The second game I listed has some great models that could be used for military units, and could speed things up. The liscences seem pretty unrestricted, but I don't know legal well, and I'm not sure if the liscences I read cover the source code and models, or just the source. Could anyone tell me simply wether or not its possible to use these files?

(BTW, if you're wondering where the models are on UFOAI, just look for the pk3's and extract them. 7-zip will do nicely [doesn't say anything about the ability to unzip pk3, but it still can]).

Fast replies are appreciated!

[hailstone]

If you're really stuck you could probably ask at the fsf.org mailing list. http://www.gnu.org/licenses/license-list.html#LicensingMailingList

[@kukac@]

Why don't you ask the creators directly? They can even give you some privilege other than licensing 
And it's better to tell them, rather using their models without speaking to them before. They will appretiate it more.

[titi]

For nexuiz I can say its allowed as long as your project is also released under the GPL!

UPDATE:
From what I see in their SVN Ufo AI is ok too!

In both cases you have to credit the authors/projects in a file called COPYRIGHT and you must include a copy of the GPL_license text.
All those gpl games should have such a file and you can have a look at it!
You can look at the megapack how to do it. If you do it this way its perfect.

[Omega]

Perfect! I have some awesome models available! I'm going to personally ask for permission though too.