Media Manager allows you to restrict access to your account or your content by setting IP restrictions. There are two ways to restrict access using IPs.
You can restrict access to your content by going to the "Access" tab on the edit popup.
You can then provide a list of IPs or IP ranges to either allow or deny. You must first toggle the ON switch for that access setting and then select either "Only Allow" or "Only Deny".
Once saved, that video will then be restricted based on those IP settings.
You can also restrict access to your account from a given IP or IP range.
You can go to your account page and select the access tab, then you select the IP restriction tab (selected by default). Then you can enter IPs or IP ranges in the box provided.