They could offer a way to download a copy and steganographically tag it to hell with your id so that they know if you distribute it. You can “loan it out” by letting friends stream off your Plex or whatever. If you start selling that streaming service or it shows up in torrents, it has your ID on it.
Boom, you own it forever and you’re incentivized not to over share.
Or you know sell DRM free versions and let people do whatever, but that probably has a snowballs chance in hell.
The fingerprinting I’m talking about gets encoded in the screen recording too. Subtle pixel changes here or there over the entire length of the video. It’ll be lossy when it’s transcoded, but over the whole video it’s there enough times it won’t matter. Even scaling to lower quality won’t fix it and then it’ll also be lower quality.
It’ll be like DRM, there will be people trying to remove it like anything else. They’ll break one thing and another will come along. There would still be a black market, but most people can get an unrestricted copy in exchange for money so there’s one less reason to pirate.
Unless you’re actually pointing a camera at the screen, then OK, you do you.