Methods and systems for downloading subscription data to a client system associated with a subscriber are provided. In one embodiment, these methods may include causing a pass-phase to be generated, with this pass phrase associating a unique identifier of a device of the client system with the subscriber. These methods may also include encrypting the subscription data based at least in part on the generated pass-phase, such that the subscription data is uniquely associated with both the device of the client system and with the subscriber. In addition, when the device is changed, the subscription data is no longer able to be decrypted, and when the subscriber is changed, the subscription data is no longer able to be decrypted. These methods may further include transmitting the encrypted subscription data to the client system.