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Would I be infringing on Valve copyrights if I used everything that came with Hammer and put together a new game? It's a game from a Combine point of view. I call it The Uprising. I don't know much about copyrights (I read the post about copyrights at the top, but it only mentioned from one company to another).
So, in other words, is it legal if I make a mod of HL2 with their textures, models, etc., come up with a new logo and name?
If not, what do I have to do to make it legal? Would getting Valve permission be enough or do I have to get some legal documents filled out?