[L. Duke]

That seems like a violation of the SDK terms of use.

C. Source SDK. Your Subscription(s) may contain access to the Valve software development kit (the "SDK") for the computer game engine used in Half-Life 2 and other compatible Valve products (the "Source Engine"). You may use, reproduce and modify the SDK on a non-commercial basis solely to develop a modified game (a "Mod") for Half-Life 2 or other Valve products compatible with and using the Source Engine. You may reproduce and distribute the Mod in object code form, solely to licensed end users of Half-Life 2 or other compatible Valve products, provided that the Mod is made publicly available and distributed without charge on a non-commercial basis If you would like to use the Source SDK or a Mod for a commercial purpose or activity, please contact Valve at [email protected].