A federal tax lien is an involuntary lien because it arises by operation of law when federal tax obligations are unpaid; it is not created voluntarily by the property owner as loan collateral. A HELOC loan is voluntary because the borrower intentionally grants a mortgage or security interest to secure the credit line. A deed restriction is a covenant or limitation affecting use of the property, not a lien for payment. A life estate reservation creates or reserves an estate in land, not a creditor’s lien. The Pennsylvania Title Insurance exam outline expressly includes voluntary and involuntary liens, federal liens, judgments, taxes, and assessments under Title Exceptions and Procedures for Clearing Title.