Excise the word "just" from your engineering vocabulary and you'll be better able to come across as naive instead of condescending or dismissive. I'm not trying to be snarky here, this is a genuine recommendation that will help your ideas be better received, both in the workplace and on internet forums.

That’s a good point. The sentence does sound better without “just”. Though in this case I was trying to account for what I thought was a simple solution.

It's encrypted across the cable itself, the capture card wouldn't be able to understand the signal.

the monitor itself is doing the unencrypting. As the other person said, it's specifically to protect the video from ... you.