There is no method for consumers to validate copyright status of digital files. It would be interesting if someone started selling drm-free high quality downloads for copyrighted videos while (falsely) advertising as being legal and fully licensed for sharing copies with friends.

I'd pay 0.05 per movie for plausible deniability (in addition to quality and reliability): would be much harder for movie studios to bring a case against you if every file came with a license for which there is no consumer mechanism to validate - ideally spliced in as a preroll. Something like "This copy of $moviename is licensed for unlimited sharing and copying by $studioname". Would be incredibly cheap to automate with ffmpeg, and would plausibly reduce prosecution risk for everyone downstream.