As someone who sometimes uses copy/paste for sensitive information (e.g. to copy passwords from a password manager), this makes me very uneasy if true. Does anyone know if this is documented somewhere? I had assumed that the universal clipboard works similarly as Airdrop, which does not upload anything to iCloud (but rather uses a combination of Bluetooth and peer-to-peer Wifi to transfer the data locally). Unfortunately the iOS Security Guide has not yet been updated to cover the universal clipboard.