I work in a similar industry and many times content providers require you to implement a system for this kind of identification. It's nothing special technicall

I work in a similar industry and many times content providers require you to implement a system for this kind of identification. It's nothing special technically, you just display a unique ID over the video on ALL client devices for a fraction of a second when a potential infringement is under way - just enough to get evidence that lets you later identify the user from the recording.