EX-4.17



 Exhibit 4.17 

SUPPLEMENTAL INDENTURE 

SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of May 2, 2016, among those subsidiary guarantors
listed on Annex A (the “New Subsidiary Guarantors”), each a subsidiary of PRIME SECURITY SERVICES BORROWER, LLC (or its successor), a limited liability company organized under the laws of Delaware (the “Company”),
and PRIME FINANCE INC. (or its successor), a corporation incorporated under the laws of Delaware (the “Co-Issuer” and, together with the Company, the “Issuers”), the existing
Subsidiary Guarantors and WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking association, as trustee and collateral agent under the indenture referred to below (the “Trustee”). 

W I T N E S S E T H : 
 WHEREAS
the Issuers, certain Subsidiary Guarantors and the Trustee have heretofore executed an indenture, dated as of May 2, 2016 (as amended, supplemented or otherwise modified, the “Indenture”), providing for the issuance of the
Issuers’ 9.250% Second-Priority Senior Secured Notes due 2023 (the “Notes”), initially in the aggregate principal amount of $3,140,000,000; 

WHEREAS Sections 4.11 and 12.07 of the Indenture provide that under certain circumstances the Issuers are required to cause the New
Subsidiary Guarantors to execute and deliver to the Trustee a supplemental indenture pursuant to which the New Subsidiary Guarantors shall unconditionally guarantee all the Issuers’ Obligations under the Notes and the Indenture pursuant to a
Subsidiary Guarantee on the terms and conditions set forth herein; and 
 WHEREAS pursuant to Section 9.01 of the Indenture, the
Trustee and the Issuers are 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 New Subsidiary Guarantors, the Issuers and the Trustee mutually covenant and agree for the equal and ratable benefit of the holders of the
Notes as follows: 
 1. Defined Terms. As used in this Supplemental Indenture, terms defined in the Indenture or in the preamble or
recital hereto are used herein as therein defined, except that the term “holders” in this Supplemental Indenture shall refer to the term “holders” as defined in the Indenture and the Trustee acting on behalf of and
for the benefit of such holders. The words “herein,” “hereof” and “hereby” and other words of similar import used in this Supplemental Indenture refer to this Supplemental Indenture as a whole and
not to any particular Section hereof. 
 2. Agreement to Guarantee. The New Subsidiary Guarantors hereby agree, jointly and severally
with all existing Subsidiary Guarantors (if any), to unconditionally guarantee the Issuers’ Obligations under the Notes and the Indenture on the terms and subject to the conditions set forth in Article XII of the Indenture and to be bound
by all other applicable provisions of the Indenture and the Notes and to perform all of the obligations and agreements of a Subsidiary Guarantor under the Indenture. 







 3. Notices. All notices or other communications to the New Subsidiary Guarantors shall be
given as provided in Section 13.02 of the Indenture. 
 4. Ratification of Indenture; Supplemental Indentures Part of Indenture.
Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture
for all purposes, and every holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. 
 5. Governing
Law. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF CONFLICTS OF LAW. 

6. Trustee Makes No Representation. The Trustee makes no representation as to the validity or sufficiency of this Supplemental
Indenture. 
 7. Counterparts. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an
original, but all of them together represent the same agreement. 
 8. Effect of Headings. The Section headings herein are for
convenience only and shall not affect the construction thereof. 
 [Remainder of page intentionally left blank.] 

  
 2 








 Annex A 

THE ADT CORPORATION 
 ADT CANADA HOLDINGS, INC. 

ADT HOLDINGS, INC. 
 ADT US HOLDINGS, INC. 

S2 MERGERSUB INC. 
 ADT INVESTMENTS, INC. 

ADT LLC 
 ELECTRO SIGNAL LAB, INC. 

  
 3 








 IN WITNESS WHEREOF, the parties have caused this Indenture to be duly executed as of the date
first written above. 
  

			
	PRIME SECURITY SERVICES BORROWER, LLC
		
	By:	 	 /s/ Timothy J. Whall

		 	Name: Timothy J. Whall
		 	Title:   President
	
	PRIME FINANCE INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	Title:   President
	
	ASG INTERMEDIATE HOLDING CORP.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	ASG HOLDINGS LLC
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	ALARM SECURITY GROUP LLC
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	ABC SECURITY CORPORATION
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President




  
 [Signature Page to
Supplemental Indenture] 








 
			
	BRINKMAN SECURITY, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	ASG GOVERNMENT SERVICES LLC
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	NOLAN’S PROTECTION SYSTEMS, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	PROTECTION HOLDINGS II, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	PROTECTION ONE, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	PROTECTION ONE ALARM MONITORING, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President




  
 [Signature Page to
Supplemental Indenture] 








 
			
	SECURITY MONITORING SERVICES, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   Vice President

	
	PROTECTION ONE SYSTEMS, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	PROTECTION ONE DATA SERVICES, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	PROTECTION ONE ALARM MONITORING OF MASS., INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	MONITAL SIGNAL CORPORATION
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	THE ADT CORPORATION
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President




  
 [Signature Page to
Supplemental Indenture] 









			
	
	ADT CANADA HOLDINGS, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	ADT HOLDINGS, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	ADT US HOLDINGS, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	S2 MERGERSUB INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	ADT INVESTMENTS, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President

	
	ADT LLC
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President




  
 [Signature Page to
Supplemental Indenture] 








 
			
	ELECTRO SIGNAL LAB, INC.
		
	By:	 	 /s/ Timothy J. Whall

		 	 Name: Timothy J. Whall

		 	 Title:   President




  
 [Signature Page to
Supplemental Indenture] 








 
			
	 WELLS FARGO BANK, NATIONAL ASSOCIATION, not in its individual


capacity, but solely as Trustee and Collateral Agent

		
	By:	 	 /s/ Stefan Victory

		 	Name: Stefan Victory
		 	Title:   Vice President



  
 [Signature Page to
Supplemental Indenture]