Mostly private courses and experience built up over the years driven by the need to use and train on it for journalists and activists at risk. On a few, thankf

Mostly private courses and experience built up over the years driven by the need to use and train on it for journalists and activists at risk. On a few, thankfully limited occasions I've had to use it in relation to myself where a real threat existed but rarely enough. Mostly when I've had to use it personally it was to ensure I wasn't risking anyone I was meeting or if I wasn't sure if they might be a deliberate/accidental security threat. We teach it on some of the source protection training courses with do with journos/NGOs. Also we write some basic stuff about it in our open source app, Umbrella. Some activists are threatened by actors ranging from kidnap to ISIS, from corporate to government intelligence, from crime to stalkers. So it's very useful for helping people identify a wide range of threats early. Also just generally for getting peoples heads up out of their phones and off the ground and taking in more alertness of their surroundings - the sort of Coopers Colour Code style thinking.