Protection against video downloads on the site?

Question

Video

Good afternoon. The site will contain video content (training material), with paid access to video. Please tell me how you can protect the video on the site (well, or seriously complicate the task). And if you manage to upload it and post it somewhere, then how can you track that this uploaded video was bought by some particular person.

Answer 1

It is useless to defend against the first (well, you can write a self-made player, but it will cost a lot in terms of support), from the second - embed watermarks .