You do not succeed, don't even try.The analog hole
(eng. analog hole) — fundamental and insurmountable
vulnerability of any methods of copy protection of digital data such as audio, video, images and text associated with the ability to copy these data in analogue form, available for human perception.
You can only make it difficult to download a compressed video - but the video being played you can always save yourself; have it only compress.
And all attempts to hinder the downloading - will no longer interfere with legal users (glitches, bugs, lags) than hackers.