How is the video platform of Poly Vision encrypted?

Poly Vision uses key frame disorder technology to realize file-level DRM3.0 encryption, which means that even if the file is stolen, it cannot be played. There is also OVP video anti-theft chain technology, which prevents unauthorized reference of videos by limiting black and white lists; In the aspect of reverse recording screen, video watermark (video watermark is inserted when encoding to highlight copyright information), video marquee (designated text is scrolled on the player to reverse recording screen), and question answering player (corresponding questions pop up after learning knowledge points, and students can continue playing video after answering correctly), so that the cost of screen recording is extremely high and the probability is extremely small; In this way, anyone who wants to open the video must be authorized or authenticated to open the video, and there is no need to install any client or software when decrypting.