I tried and failed to get Stunnel to work.
All of my cams are on their own subnet which is not routed to the Internet.
Blue Iris itself is so I can access it from anywhere and Blue Iris is constantly being dinged by parties unknown from all over the world. Recently somebody got in for 43 seconds. This set off alarms in my head. The password is sufficiently complex that I'm certain they didn't get in via a password hack.