How to protect videos ?
On self hosted videos you can disable right click over the video to prevent “Save video” action.
Also, to protect your videos in a way that nowbody can see your video content (even if it’s “downloaded”) is to use HTTP Live Streaming – HLS m3u8 format.
This will help to understand better: link, this way nobody can view your video.
Convert your .mp4 files into .m3u8 format to protect your videos.
In addition to that, this tool helps to prevent users to view your wordpress page source, blocks right click and more: https://wordpress.org/plugins/wp-content-copy-protector/