Board Thread:Naruto Discussions/@comment-26510601-20150926001251/@comment-1018594-20150926025433

It's a jutsu than the majority of the clan can use, which is different from a Hiden, which is specifically kept within the clan to prevent outside usage.

For example, the Uchiha clan was known for using Fire Release: Great Fireball Technique, but that doesn't make it a Hiden jutsu because we've seen non-Uchiha using it. It just happens that all known users of Fire Release: Ash Pile Burning happen to be from the Sarutobi clan.