As the DROID 3 sports an OMAP processor, chances are quite high that it will feature eFuse built right inside, meaning your handset will end up as an expensive paperweight if you have the guts (and stupidity, we would say) to unlock the bootloader. Still, this does not mean that you can’t root (letting you gain access to parts of the operating system which you normally can’t, so that other custom software which aren’t necessarily malicious can run, such as those from the homebrew scene the smartphone if you apply the same theory with the DROID X.
Motorola sure ain’t making it easy for you to love them when it comes to simple unlocking and rooting of your phone, that’s for sure.