This leaves a sour taste in my mouth. Because the source code is not real open source, the contributors of those fixes have fewer rights to their own code than Valve. Valve should have just made the code proper open source. Keep the art assets proprietary, basically what id Software did when they were still cool. It's not like the Source 1 Engine contains great trade secrets after all those years since release and if it did, the non-commercial license would not keep snooping eyes away.