1. A system comprising: an electronic appliance, the electronic appliance comprising a first protected processing environment, the first protected processing environment being operable to encrypt data for transmission to a second protected processing environment associated with a peripheral device and to decrypt data received from the second protected processing environment; and a peripheral device, the peripheral device comprising a second protected processing environment, the peripheral device being communicatively coupled to the electronic appliance, the second protected processing environment being operable to encrypt data for transmission to the first protected processing environment and to decrypt data received from the first protected processing environment, the second protected processing environment comprising memory comprising instructions that, when executed by the peripheral device, are operable to read control information specifying one or more permitted uses of data received from the first protected processing environment, and to enable the data received from the first protected processing environment to be used only in the manner specified by the control information.