How to protect the video for sale?

Question

Video

Good afternoon, we plan to sell unique video content. I perfectly understand that it is unrealistic to protect against data copying, but I would like to at least understand who leaked the video to the network. I heard that there are programs that put some marks in the video, on the basis of which you can understand whose particular copy has leaked to the network. What other ways of such protection? Can replace one frame with the text where the buyer is indicated? Maybe there are other ways? What software can be used to check these marks after processing?
Thanks in advance.

Answer 1

Enlighten yourself