Taking private lessons and/or training with a instructor for many years does not make you a lineage student.
An indoor student is allowed inside the private centre of the instructor's art.
A formal, public pledge is required, along with a gift symbolising your commitment to look after your instructor's wellbeing.
Traditionally, a tea ceremony takes place in which the lineage candidate(s) makes a public declaration of their intent.
The instructor accepts the student(s).
Photographs may or may not be taken, and the student may be given a lineage chart showing how the art has been passed on.