Rename device name (ch340 usb to serial) Mac OS
I am Antonis from codebender and we recently released drivers for the Mac.

If you want to overcome this problem, without disabling your computer's security settings, maybe I can help you with this! Codebender just released their Mac drivers package, which includes a new driver that supports the CH340G chip, on Yosemite and all other versions of OS X for Mac.

This will help you to install these drivers securely, and
all you have to do is to download and install them.

You can find more information about the drivers in the codebender blog.