Lien waiver can be defined as a release of a claim of lien. These waivers are usually governed by state laws. When a lien waiver is signed, rights to link a lien to goods or property is relinquished.
Some typical examples of liens which may be subject to waiver include a mechanic’s lien, a materialmen's lien, and a tax lien. The reason why a lien is usually waived is to allow the proper transfer of property or as a condition of payment of work on the property.