PC Guardian Physically Locks USB Ports

It is known that USB keys can be used to steal data or install malware/spyware software on your computer. If you believe that you’re at risk, you could think that this USB port lock is what you need. After all, it’s easy to install and is a simple physical look for the USB port.

The issue is that now you also need to lock the whole case. Also, it’s not clear to me how it protects the two USB ports just underneath the locked one on the photo. Anyhow, it’s up to you to see if this is going to help, but it doesn’t seem unbreakable at all.