The invention relates to a video conversion in front of the direction (1), with a hdmi - interface (10) for connection to a display device (100) and with a network interface (20) for connection to a local area network (lan), wherein the video conversion in front of the direction (1) has a converter unit (5) which is set up, a via ethernet and / or by means of an ip - protocol transported in a streaming video hdmi - signal to convert, wherein the video conversion in front of the direction (1) a, an authentication unit (30), which is arranged, at least two mac - addresses (21, 211, 221, 411) of two different, in the local network (lan) integrated devices (1, 200, 400) to a read out and the other side of a home router (200) outside of the local area network (lan) of the authentication server (300) to send.The present invention also relates to an authentication server as well as a method for checking the authorization of a video conversion in front of the direction (1) for receiving a video stream.
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