Very rough analogy: Whoever delivers your parcels can tell if you ordered parts to assemble a jumbo jet or a lawn mower just by looking at the quantity, size an

Very rough analogy: Whoever delivers your parcels can tell if you ordered parts to assemble a jumbo jet or a lawn mower just by looking at the quantity, size and sequence of parcels. Since it is known what kind of blueprints you have (the netflix library), it's not too hard to match the parcel sequence (or a part of it) to the order list of a known blueprint.