A set-top-box is provided for receiving broadcast media content and processing said content for presentation on a display. A processor of the STB is configured to receive, from between a router circuit and a modem circuit, data packets sent over a local network. The data packets are sent to or from a local internet connected user device via the router as part of the local network. The processor is further configured to analyze the received data packets to determine whether they contain undesired content and, if so, to control the display to present an indicator containing at least one property of the detected undesired content. Because the STB is coupled to a display that tends to be the main display in a household, the indicator is more likely to be seen and acted on by a responsible party, thus parents will be more easily able to monitor the activity of their children when they use user devices to access the internet over a home network.