HD-SDI and SDI video underlie the basic infrastructure of all modern video distribution networks. Quite often content is distributed far afield from where it was created, by people who do not acknowledge its origins. The owners of content feel justified in branding their content with a small semi-transparent graphical logo that is not easy to remove. Also, everyone wants to generate extra revenue by inserting video or graphical adverts over or spliced into existing content. Others wish to add data or text to annotate the video or provide emergency alerts.