There's no good reason to prevent anyone from using (say) a 1080p HDMI cable to connect a 1080p device to a 4K television, or using a 4K cable to connect a 4K d

There's no good reason to prevent anyone from using (say) a 1080p HDMI cable to connect a 1080p device to a 4K television, or using a 4K cable to connect a 4K device to a 1080p television.