Is this a good thing? Eventually people might illigally modify the source code, or interpret it and rewrite it, and people would be using secure windows (I know, an oxymoron) on their desktop. Somehow the source could be modified against anybody detecting it, or it would possibly register as a Linux or BSD box.
If people looked over the source and rewrote it in C or something that had perfect memory handling, and then copywrighted their code under GNU, we could probably say goodbye to Microsoft on the desktop. The thing it it's illigal but if nobody could prove that they looked at Windows as the source they could never be punished.