There are two broad classes of solutions that can work, and one class that doesn't. Since you are worried explicitly about competitors in the cyber-security space, you are pretty well screwed when it comes to the kinds of technical solutions you've mentioned. All of the big music providers spent hundreds of millions of dollars on DRM, then gave up when they had to admit that it just doesn't work. That's even when they are trying to limit random teenagers - you are dealing with information security experts. They will crack whatever you try to do, easily. If you give them the video (to view), you've given them the video. Period.
So we know your competitors can get your video. There's nothing that will prevent that. Really. They have it. Now what? You can put a visible watermark on your video, so if competitors use it, they are also advertising your brand. A certain industry produces huge amounts of video for the web, and generates billions of dollars doing so. For that reason, they have tried several variations of the last fifteen years and largely figured out what works. Google search "tube site" to see many, many examples of what that industry does. Along with visible watermarks added to the image, they also sometimes include their name in the video content itself "Hi, I'm Chris with Blah.com and here to teach you about Foo".
The other approach is of course the legal system - not always suing people, but also things like the "FBI warning" you see at the beginning of every Hollywood movie. What you are concerned about is unlawful, and it can be handled appropriately.