I've been wondering since the first chapter/episode or whatever. In the first chapter, Naruto steals the forbidden scroll and learns Kage Bunshin no Jutsu which was apparently forbidden? But, during the Chuunin exams when he's fighting with Neji, Neji says that Kage Bunshin no Jutsu is a Jounin level jutsu. I'm personally caught up to the manga but since it's on break I've had time to think about these stupid things.
Are shadow clones a forbidden technique or is it just a high level jutsu?