Cannot restrict video playback

I am embedding videos on my site (my own dowmain, not my wordpress blog) and wish to allow the videos only to appear on my site (https://training.toppers.com).

On the media settings page I CHECKED ‘Allow people to embed videos on other websites’ and entered ‘training.toppers.com’ into the Restrict embed playback field.

I then edited the video in WP and UNCHECKED the ‘Display embed code and allow external sites to embed this video’ checkbox.

While the video plays on my site, it also plays on a site at a different domain (www.ecodecycle.com). My understanding is that it should not play on any other domain, and I don’t want it to play on any other domain.

Can anyone tell me what I’m doing wrong?. Thank you!

Jay