BC Vault Daemon is used for BC Vault support in your Web Browser (Firefox, IE, EDGE, Chrome...) and is browser agnostic.
It is installed as a startup process (if selected - by default) from v1.2.1 on. Before it was not scheduled for automatic startup in operating system (Windows, OS X).
Process name is "bcdaemon" and it listens on TCP port 1991 on localhost (127.0.0.1), thus it is not visible from anywhere else, but from your computer.
You can START/STOP bcdaemon from inside of the BC Vault Application under Settings/Application Setting:
If you want to prevent bcdaemon to autostart with start of your operating system follow instructions below:
a) MS WINDOWS
1) Open Task Manager
2) Select "Startup" Tag
3) Right Click on "bcdaemon.exe" and select "Disable"
b) MAC OS X
Remove file "/Library/LaunchAgents/com.real-sec.bcdaemon.plist".
1) Open "Terminal"
2) Execute command "sudo rm /Library/LaunchAgents/com.real-sec.bcdaemon.plist" (without quotes) and enter your password.