I Know What You Watched Last Sunday A New Survey Of Privacy In HbbTV

Smart entertainment devices like Smart TVs, game consoles and Blu-ray players are getting more and more popularity in households. They have at least one interface that can establish a connection to the Internet. Especially Smart TVs and set-top boxes with network connection enable many third parties to provide real-time information and content directly to the consumers, for example additional information about a current TV program. HbbTV is one standardized way to deliver content to the devices via Internet. However, each vendor has additionally an unstandardized system to bring interactive content to the consumers. Most of these techniques are based on current web technologies. In case of HbbTV the content is presented on a transparent web site overlay over the current channel. As we have shown in former publications tracking techniques wellknown from web sites can be used to gather the consumers’ viewing behavior on Smart TVs without actively using an HbbTV application. In this work, we show how the current state in HbbTV has changed compared to our first survey in 2012. A new scenario where the listening behavior of consumers’ while listening to a radio channel can be gathered is introduced. Furthermore, we explain our open source protection implementation which covers both scenarios effectively. Finally, we discuss some threat scenarios with regard to the wrong usage of this data.