KPN set off some alarms in Holland last month when it announced a plan to start charging customers separate fees for using VoIP, streaming video, and sending instant messages. But, the question remained: how exactly would it keep mobile data users honest? The answer turns out to be deep packet inspection, which examines network traffic to identify what you're sending and where it's going. It's been suspected that the secret ingredient in KNP's service-throttling sauce was DPI, but it was finally confirmed in a presentation to investors recen
