term:

Lien Waiver

lien waiver

A document that releases a consumer (homeowner) from any further obligation for payment of a debt once it has been paid in full. Lien waivers typically are used by homeowners who hire a contractor to provide work and materials to prevent any subcontractors or suppliers of materials from filing a lien against the homeowner for nonpayment.

Source: U.S. Department of Housing and Urban Development