A streaming video security device (16, 18, 20', 86), comprising: an input LAN interface capable of receiving streaming video input; at least one streaming video decoder coupled at one side to said input LAN interface for streaming video input and coupled at the other side to a raw video display-compatible output; an output LAN interface capable of transmitting streaming video output; at least one streaming video encoder coupled at one side to said output LAN interface for streaming video output and coupled at the other side to a raw video display-compatible output interface; and characterized by the streaming video security device (16,18,20',86) further comprising: a unidirectional data flow element (41, 41a) coupled at the transmitting side to said at least one streaming video decoder through said raw video display-compatible output interface and coupled at the receiving side to said at least one video encoder through said raw video display-compatible input interface, said unidirectional data flow element (41, 41a) assuring unidirectional flow of data from said raw video display-compatible output to said at least one streaming video encoder via said raw video display-compatible output interface; wherein conversion to raw video protocol and back conversion into streaming video over IP traffic assures that only displayable data is passing through. an input LAN interface capable of receiving streaming video input; at least one streaming video decoder coupled at one side to said input LAN interface for streaming video input and coupled at the other side to a raw video display-compatible output; an output LAN interface capable of transmitting streaming video output; at least one streaming video encoder coupled at one side to said output LAN interface for streaming video output and coupled at the other side to a raw video display-compatible output interface; and characterized by the streaming video security device (16,18,20',86) further comprising: a unidirectional data flow element (41, 41a) coupled at the transmitting side to said at least one streaming video decoder through said raw video display-compatible output interface and coupled at the receiving side to said at least one video encoder through said raw video display-compatible input interface, said unidirectional data flow element (41, 41a) assuring unidirectional flow of data from said raw video display-compatible output to said at least one streaming video encoder via said raw video display-compatible output interface; wherein conversion to raw video protocol and back conversion into streaming video over IP traffic assures that only displayable data is passing through. a unidirectional data flow element (41, 41a) coupled at the transmitting side to said at least one streaming video decoder through said raw video display-compatible output interface and coupled at the receiving side to said at least one video encoder through said raw video display-compatible input interface, said unidirectional data flow element (41, 41a) assuring unidirectional flow of data from said raw video display-compatible output to said at least one streaming video encoder via said raw video display-compatible output interface; wherein conversion to raw video protocol and back conversion into streaming video over IP traffic assures that only displayable data is passing through.