pic 16f84 and skip security byte?

I'm not sure about this device in particular. I know some microcontrolers would have a security fuse, when blown you couldnt read the memory. What people started doing is drilling into the substrate and reconnecting the fuse. You would see ads in magazines for companies doing this.

Then some manufacturers started putting important circuitry over the fuse, so you would destroy the device if you try to drill to the fuse.