An audio input interface (122) receives a digital audio signal and
identifies an audio bitstream which is optionally decrypted by a
decryption unit (123), and decoded by an audio decoding unit (124). An
audio digital to analog converter (126) converts the decoded audio
bitstream to an analog audio signal which is optionally decrypted by an
audio analog decryption unit (127) and output by an audio output
interface (128) to an analog wireline device (100). A video input
interface (142) receives a digital video signal and identifies a video
bitstream which is optionally decrypted by a video digital decryption
unit (143), and decoded by a video decoding unit (144). A video digital
to analog converter (146) converts the decoded video bitstream to an
analog video signal that is optionally decrypted by a video analog
decryption unit (147) and output by a video output interface (148) to the
analog wireline device (100).