Fourth Generation Language ("The Last One") -> expert systems -> machine learning -> "AI"
That's it really.
Going back to the old days of cartography, map makers used to smuggle trivial errors into their products making it a cinch to spot a ripped off version.
Maybe owners of Very Large Datasets should do the same ?
(It would be an interesting demonstration of the total fail of "AI" if it couldn't spot the elephant trap and remove it .....)
It's sort of a budget version of cryptographic signing .....