Board Thread:Naruto Gaiden/@comment-5119417-20150531192409/@comment-734582-20150601110606

Riptide240 wrote: Its a kinjutsu of the Uchiha. Any Uchiha can use it. It does require the ability of a strong Yin or Yang release, so it's not a cakewalk. The idea behind a Kinjutsu seems to be that it forbids teaching of jutsu, not the use of the jutsu, so it's not like the technique would just be lying around for anyone to pick up.

EDIT: I think the guy agreed with you by the way. I agree with you too. It's doubtful that it's an easy ability to learn, but it's without genetic restrictions or special circumstances. It only requires control over the appropriate releases.