Did you know that by surfing the internet you can lose your privacy, your money and even your identity? Computer viruses and Trojans often arise during the investigation of computer-based crime, such as the downloading of child pornography. But what if you are innocent? Often Trojans are cited as the cause in what’s become known in legal circles as "The Trojan Defence". Ian Kennedy whose OU research forms the basis for this programme uncovers some of the artefacts examined and techniques to support or refute claims of innocence. Somehow losing your privacy doesn't seem so bad at all.