Final answer:
A lawsuit to 'quiet title' is used to remove an encumbrance if the lienholder cannot prove its validity.
Step-by-step explanation:
One of the purposes of a lawsuit to 'quiet title' is to have an encumbrance removed if the lienholder cannot prove its validity. When there is a doubt about the validity of a lien or encumbrance on a property, a quiet title action can be initiated to seek a court order declaring the rights to the property and removing any clouds on the title. This is done by providing evidence that the lienholder cannot prove the validity of their claim.