Outer
level: Not taking that which doesn't belong to us. Not plagiarizing.
Not "borrowing" something without permission. Giving credit
to others where credit is due when using an idea, piece of property
or object that has been handed down for the benefit of others.
Inner level: Virtue, purity. Lack of attachment towards external objects
as a source of self-esteem or identity.
Secret level: "When one ceases to take what is not theirs, whatever
is desirable comes naturally to them." Yoga Sutra II.37, Sadhana
Pada
Further commentary is forthcoming....!
see also
Ahimsa,
Satya, Brahmacharya,
Aparigraha