i'm dismissing the point the other poster made, because what I see as important is what actually happened. what I see as important about what actually happened is that the BSD license was incompatible with the situation, and if only the BSD/MIT whatever license was available, no one outside of Id or one of their contractors would ever have seen the doom source. I see that availability of the DOOM source as a great good for humanity which wouldn't have happened in a world where no GPL exists.