Thank you Joe_C for posting this. This person replied to the article over there. Whereas this means that anybody can put any kind of malware on the machine, it does raise questions as to whether or not Secure Boot is used for the purpose of preventing any other OS being installed, other than Windows and specific flavors of Linux.
Hi there! I've merged 3 similar threads & moved it to BIOS Mos section, as its the most appropriate one. Its now a sticky - please discuss here.
Just an FYI, the key is listed in one of the links on the original article, for those who want to test the concept.