A digital interface device is provided for facilitating key encryption of a digital signal which is communicated from a computer system to an associated peripheral device, such as a digital display device. The digital interface device has a digital output, digital output formatting circuitry associated...http://www.google.com.au/patents/US7178035?utm_source=gb-gplus-sharePatent US7178035 - Write once system and method for facilitating digital encrypted transmissions
