"My code is freely licensed open source, Based on GPL, with the addendum that Goldman Sachs can go stick their head in a pig"
As I understand it, there is nothing preventing this from happening.
It is surely open source. It's just not Open Source. An important difference because of the capitalization.
http://opensource.org/osd
So that even if they're speaking out loud, where one can't see capitalization, everyone knows what they mean.
"My code is freely licensed open source, Based on GPL, with the addendum that Goldman Sachs can go stick their head in a pig"
As I understand it, there is nothing preventing this from happening.