The most obvious Larry Niven book for this concept would have to be Footfall - http://en.m.wikipedia.org/wiki/Footfall http://en.m.wikipedia.org/wiki/Footfall

The most obvious Larry Niven book for this concept would have to be Footfall - http://en.m.wikipedia.org/wiki/Footfall http://en.m.wikipedia.org/wiki/Footfall Humans beat up on some invading aliens that got their interstellar tech from one such reboot library, and then go and invade Earth. We win because their knowledge is deep but narrow, and we exploit that.