Devices of an individual's device-sphere recognize risky or undesirable behavior requested by devices outside of the device-sphere and allow the user to prevent the behavior. The user's decision is stored and used to protect all devices of the user's device-sphere from similar risky behavior from the outside devices. If the choice is made for all devices of the user's device-sphere, the choice is broadcast to other devices of the user's device-sphere such that other devices can benefit from the choice made by the user.