The machine's designers must not be able to explain how their original code led to this new program.
Whoa, whoa, whoa. I have severe problem with this. This is like looking at obscurity and declaring it a soul. The measure of intelligence is that we can't understand it? Intelligence through obfuscation? There should be no way for a designer to not be able to figure out why their machine produced what it did given enough debugging.
The best way to avoid responsibility is to say, "I've got responsibilities."