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air interface that's proprietary to the vendor. And they basically send the data out on a sub layer within the primary stream. And that's how they establish their encrypted interoperability between two different brands. Sorry, because of this, that's why it's very difficult to have interoperability between two different brands because of the way the key layer is interfaced into it. So like trying to get a Motorola to talk to something like, let's say, a Hyterra or a Titerra, one of them, it's very, very difficult or impossible without having synchronized firmware, which in many cases doesn't exist.