So I saw this post: Securing a video using encryption about encrypting videos so people wouldn't just download them, and upload them somewhere else.
Pretend that my site made people pay for membership to watch the videos on the site, and Say that I could encrypt the videos, and it would be impossible to decrypt/download them(Not saying that I can).
To fix the problem of someone recording with a screen recorder, or even with a camera on the computer screen, would it be legal (with some kind of contract you agree to when you sign up), and/or a good strategy to put the user's (viewer) credit card info that they used to buy membership in some kind of watermark over the video (covering the whole video but really transparent)? It would prevent them from leaking, because they obviously don't want their credit card stolen.
This isn't for blackhat purposes, I'm not going to do this, I'm just wondering if it would be reasonable, and if it would work.
Putting aside all the legal issues, I just want to know if it would work/be reasonable
EDIT: Also, if this isn't legal (it probably isn't) would it still work if some other personal info was used (like an ip address or something)?