Board Thread:Lore Discussion/@comment-8248675-20130606043855/@comment-8248675-20140521071230

Also, Nords don't know T'hum at birth, only Dragonborn knows it naturally. Nords are born with a better ability to learn it, probably because of their speech craft. Anyone can learn T'hum, but they have to study with Greybeards for many years, just to learn a single word of power and not everyone allowed to study with them. I also haven't heard of Empire forbiding the use of T'hum.