A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
Widevine DRM Overview — Google for Developers
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Вячеслав Агапов
"If we hadn't had the co-CEO model, we probably would have felt that we needed to find a new CEO, or even sell the business, which are things that happen to so many female-run businesses because they don't see how it's going to work. Our experience was that this can really work."