You'd think so, but I've already run into a situation where DRM broke our screen capture for a live talk recording and I simply set up a camera to record the screen.
With a little bit of work (display a few calibration targets and build a quick and dirty LUT to match your display) you can get really convincing results.
It was good enough for the moon landing. The video feed from Apollo 11 was some special format that was specially decoded onto a particular monitor. There was a camera pointed at the screen to rebroadcast the feed globally.
With a little bit of work (display a few calibration targets and build a quick and dirty LUT to match your display) you can get really convincing results.