http://ssd.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/ps/module/guide-pratique-chiffrer-votre-appareil-windows
This is useful if you want to protect your data from roommates, coworkers or employers, school officials, family members, partners, police officers, or other law enforcement officials. It also protects the data on your devices if they are stolen or lost, like if you accidentally leave your laptop on a bus or at a coffee shop.