Abstract: A device comprising: at least two interfaces for interconnecting between at least one audio source and at least one audio sink device; and unidirectional circuitry configured to allow transmission of an audio signal only from said at least one audio source to said at least one audio sink device.

Abstract: A Secured Keyboard Video and Mouse (SKVM) system for selectively controlling a plurality of individual computers by a single set comprising a keyboard, a pointing device and at least one video monitor (in some cases, can be controlled also by computer), the SKVM comprising separate electrical circuits for transmitting the display sources, the pointing device and keyboard communications.

Abstract: A device comprising: at least two interfaces for interconnecting between a video source and a video display, wherein each of said interfaces comprises at least a video data channel and a display settings channel; and unidirectional circuitry; wherein said unidirectional circuitry is configured to allow transmission over said video data channel only from said video source to said video display, and wherein said device is configured to (i) receive, over said display settings channel, display settings data from said video display, and (ii) transmit, over said display settings channel, said display settings data to said video source.

Abstract: A device comprising: at least two interfaces for interconnecting between at least one audio source and at least one audio sink device; and unidirectional circuitry configured to allow transmission of an audio signal only from said at least one audio source to said at least one audio sink device.