how to hide the real embed video of youtube?

Hey guys I just want to ask if anyone knows how to hide the youtube url or even the link it self in HTML.

I am not sure if you have encounter this but I know some sites that has a way to hide the real URL of their videos. Aside from putting in unlisted which will make the video unsearchable in Youtube, they have manage a way to hide the URL at plain sight.

I tried scraping both sites but they are good I had a hard time and no avail, but I think if I use wireshark or fiddler I will get the right URL.

So here are the 2 scenario and sites that has a unique hiding scheme,

First Site: When you copy the video link it results to the embed copy but there is no youtube ID. I tried inspecting the elements and right their there are no id in the iFrame of the source.

Second Site: When you copy the link of a video, a different video is copied but when you play it, it is the right video. Again when you copy it while playing, a different video will be copied

Does anyone know how can they do this? I need this for my startup bussiness and as much I want to make it secure

THANKS!