The next time you set up a smart device,

: Turn off "Universal Plug and Play" on both the camera and the router. This feature can automatically open ports to the internet without your knowledge.

Your DVR likely uses port 80, 8080, or 37777. Change this to a random high port (e.g., 54321). It won't stop a dedicated attacker, but it will stop Google bots.

Specifically, it is a search query used to find internet-connected security cameras (webcams) that are publicly accessible and have not been secured with a password.