>>>>          Were those mods technically illegal? Valve hadn't given permission in
>>>> general to make mods?
>>>    I think that if Valve had wanted, they could have prohibited all mods of
>>> their game. It's not unprecedent.
> 
>>         Yes, but what I'm asking is did they give explicit permission before 
>> those mods were released, or did they simply accept them after the fact?
> 
>   I don't know, but given that modding of FPS games is quite hard without
> explicit support from the game, I'd say they supported modding from the
> start (similarly to how, for example, Id Software has always done).

As I understand it, currently if you purchase any Valve game powered by 
the Source engine, you can download the Source Developer's Kit for free 
and play around with it. (What I don't know, however, is what if 
anything you're allowed to do with the content you generate. But for 
example, every major update to Team Fortress II includes at least one 
user-produced map...)

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