Abstract: A message transmission system having at least one subscriber's terminal device that is connected by way of a subscriber's line that is comprised of a first and second lead, with a subscriber's interface circuit (SLIC), preferably integrated, which comprises a loop detector circuit and subscriber's feeder circuit, such that in the area of, or on the subscriber's terminal device, a subscriber signaling display is provided, which may be controlled by way of a signaling control circuit, and such that a controllable switch (8) is connected between the subscriber's interface circuit (3) and the first lead (a) of the subscriber's line (a, b), which switch, in a first position, connects the first lead (a) of the subscriber's line (a, b) and an input of the subscriber's interface circuit (3) with each other, and in a second position, connects the first subscriber's line lead (a) with a pole of an additional power source (5).

Abstract: A method and system to activate or deactivate modifiable features, the system comprising a protected device having a plurality of modifiable features and an identification means, a protective device for modifying the modifiable features of the protected device, wherein the protective device is adapted to be in selective in communication with the protected device and the protective device comprises a processor, a first memory in communication with the processor for storing a plurality of activation codes, a second memory in communication with the processor for storing a plurality of release programs corresponding to the activation codes.