Exhibit 4.1

SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of November 5, 2013, by and among Audatex North America, Inc., a Delaware corporation (the “Issuer”), the guarantors set forth on the signature page hereto (collectively, the “Guarantors”) and U.S. Bank National Association, as trustee (the “Trustee”).

W I T N E S S E T H

WHEREAS, the Issuer and the Guarantors have heretofore executed and delivered to the Trustee an indenture (the “Indenture”), dated as of July 2, 2013, providing for the issuance of an unlimited aggregate principal amount of 6.00% Senior Notes due 2021 (the “Notes”);

WHEREAS, Section 9.01(7) of the Indenture provides that additional Notes may be created and issued from time to time by the Issuer without notice or consent of the Holders, and the Indenture further provides that such additional Notes shall be treated as a single class with the Initial Notes for all purposes under the Indenture and shall have the same terms as to status, redemption or otherwise as the Initial Notes;

WHEREAS, the Issuer and the Guarantors desire to execute and deliver this Supplemental Indenture for the purpose of issuing $510,000,000 in aggregate principal amount of additional Notes, having identical terms as the Initial Notes (the “Additional Notes”); and

WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

[Supplemental Indenture]

[Supplemental Indenture]