Board Thread:Theories and Speculation/@comment-5119417-20150524174321/@comment-25319479-20150524175117

From ShonenSuki's translation of the third databook:


 * Kakashi's original dōjutsu, released from the Mangekyō Sharingan. It allows one to transfer anything to another dimension. If one spends a lot of time and trains one's chakra over and over again, this technique can be invoked. The target is enveloped with a barrier space and the user concentrates their mind to what they gaze at… The target can struggle helplessly, but against this technique no defence is possible. No matter what, the space will distort and draw the target in.

I wasn't aware of that description till TTF's comment a few days ago. So basically anyone with a Mangekyo Sharingan can learn Kamui.

Link for references: User:ShounenSuki/Third Databook Translations