>Use a GPL 2.0 licensed engine as the basis for a new engine
>Release new engine as proprietary
>Fuck you I'm not giving you the SOURCE of my GOLD SOURCE engine.
Did Valve cheat witht he GPL license ?

>>105939351 (OP)
I think ID sold commercial licenses.

GoldSrc isn't based on the open-source Quake release. They bought the license to use and do their own shit with it directly from id games.

That should be clear from the very image you posted: The Quake open-source release is in 1999, Half-Life was already released at that point.

>>105939351 (OP)
you can distribute software under different licenses.

>>105939351 (OP)
>Quake source: 1999
>Half-Life: 1998
retard

>>105939521
>>105939390
thanks bros, I'm indeed retarded