This document discusses asset locks, which refer to rules that protect an organization's assets in perpetuity for its stated public purpose rather than allowing private distribution. There are different ways to implement an asset lock, such as rules limiting profits/asset distribution, requiring supermajority approval for rule changes, or requiring regulator consent for rule changes. An asset lock does not prevent ordinary business or asset transfers to other public purpose organizations, but is intended to prevent private gain from an organization's assets. Consideration should be given to an organization's asset value and structure's ability to protect assets when choosing a legal structure.