The present disclosure provides methods and systems for managing viewable content on a display. This transcoder system has a decoder device on its input side and a coder device on its output side, the latter consisting of a series circuit of a quantizer for requantizing the data dequantized in the decoder device, with a requantization factor, also with a subsequent VLC coder and an output buffer. The plane of each compression surface can be predominantly tangential to the apparatus central longitudinal axis. If the sender is an approved sender, the reduced alert mode will be deactivated.