Planning on going to a protest? You might not be aware that just by showing up, you can open yourself up to certain privacy risks — police often spy on protesters, and the smartphones they carry, and no matter how peaceful the demonstration, there’s always a chance that you could get detained or arrested, and your devices could get searched. Watch this video for tips on how to prepare your phone before you go to a protest, how to safely communicate with your friends and document the event, and what to do if you get detained or arrested.