The highyield indenture is a complex and sometimes highly negotiated agreement. An indenture agreement is a legally binding document or contract that establishes terms and conditions between two or more parties.Noteholders may not enforce the Indenture or the Notes except as provided in the Indenture. An indenture agreement is a legally binding document or contract that establishes terms and conditions between two or more parties. If the location has changed, the Issuer has provided the. Trustee with prompt notice. An indenture, signed at the closing of the issuance of the notes, is a contract between the issuer of the notes, any guarantors of the debt and the trustee. Documents in any action arising out of the provisions of the indenture. United States. About. Established in this Trust Indenture and shall be applied in the manner set out herein.