All our videos on Vimeo are marked as private and we need to "white-list" the domain so they can be displayed on your site.
All our videos on Vimeo are marked as private and are only available to be embedded on other websites if we have listed your website as one of our customers.
This is called white-listing the domain.
If the domain you are using is not white-listed you will get an error that says something along the lines of "This video is private" or "You are not authorized to view this video".
So before you start you need to send us the domains that you will be using and we will register them as "safe".
Note that it might be more than one domain that you need to whitelist.
One might be for the learning management system when editing, and another one is intended for your employees when they are taking the courses.