How is it possible that you have a desktop that doesn't have a video output on it at all? Obviously, your computer must have some sort of video output, and if it is modern, it will have a HDMI, DisplayPort, or USB-Type-C video connection. The last two have basic converter cables you can buy online. USB-C to HDMI or DP to HDMI cables are readily available.
DRM should not be an issue with MOST computer content as long as the content itself isn't DRM protected.
It would be helpful if you put up an image of the back of your PC.