Takeaway: Compares security to a barn door, along with the comment, after an incident, "That's like closing the barn door after the horses are gone." But many doors, i.e. security, have good and bad features, serving as both a barrier to hold out elements, and an entranceway for livestock and visitors. Using that analogy, it does not make sense to calculate an ROI on your barn door (i.e. security).
Source: Security Views
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