This Law Overrides All Laws == Kill All Humans ? True : False

[Xeram]

I've always interpreted "override" as "Replace X (where X is usually "all laws") with Y (where Y is usually the "override law")" Resulting in all your laws being made into the newly uploaded one, and conseqentially turning off the default 1 - 3. As long as you wrote the lack of murdering you into the law itself it should be fine, but I don't see in what course of logic does stating something overrides something else suddenly mean the AI has no laws rather than one repeated over and over.