Is lien a legal document?

Is lien a legal document? A right which entitles a party to hold on to assets in his possession pending payment of a debt owed. It can arise in the following ways: Equity. From the operation of law (a legal or common law lien).

A right which entitles a party to hold on to assets in his possession pending payment of a debt owed. It can arise in the following ways: Equity. From the operation of law (a legal or common law lien).