Unfortunately I don't think the DVI-D input is HDCP so you can use that.
You can use an HDMI to RGBHV/VGA plus audio converter. That will give you a stereo analog audio output.
If your audio system has a digital input then you would use an HDMI input selector with audio extraction to provide a digital audio output for better surround sound. In that case you can use a converter without audio the audio output.