There is no doubt that as the move into the digital world of television advances, viewers should be able to see far sharper and more beautiful images. NHK, or Japan Broadcasting Corporation, has already demonstrated a system using 7,680 by 4,320 pixels, compared with today's 1,920 by 1,080, which is considered the highest standard to date. The only real problem with such systems is the ability to store and send such a signal, but as technology improves that is getting better all the time too. One of the more interesting aspects of all this is what is being called the convergence of home entertainment. There will almost certainly come a time when viewers may not even care where the signal comes from (if indeed they care now). It will appear after they have paid for the content. Homes in the not-too-distant future could well have their own media servers. Technology will have to get a lot better for that to happen, of course, but it is the direction we are going in. In order to broadcast NHK's ultra-high definition signal, it would require a greater bandwidth capability; fibre optic cabling is one solution, but that would have to be paid for by the broadcaster and the end user. The onset of digital broadcasting is likely to lead to a movement in the opposite direction as well. Video on small screens is taking off. One thing that is already happening via such services as YouTube is consumer-generated content. This is likely to become even greater. As mobile phones and digital cameras begin to support higher resolutions, the content becomes clearer and therefore more watchable. As all this happens, there is one thing that only a few people have thought about and that is the legality of these images. In the past, you could show a negative to a court and it could be easily determined if it had been tampered with. The image could stand up in court. As society moves to an all-digital mode of creating and looking at images, it becomes more difficult to determine what is genuine and what has been digitally altered. Already it is possible to alter a digital image without leaving a trace and it will soon be possible to do the same with digital video at very little cost.