Document:

Exhibit 10.63

 Exhibit 10.63 
 EXECUTION COPY 
 CONSENT AND WAIVER dated as of April 13, 2006 (this
“Consent”), relating to the Credit Agreement dated as of April 22, 2005 (as amended, supplemented or otherwise modified from time to time, the “Credit Agreement”), among DELTEK SYSTEMS, INC., a Virginia
corporation (the “Borrower”), the Lenders party thereto and CREDIT SUISSE (formerly known as Credit Suisse First Boston), as administrative agent (in such capacity, the “Administrative
Agent”) and collateral agent for the Lenders. 
 A. Pursuant to the Credit Agreement, the Lenders and the Issuing Bank
have extended, and have agreed to extend, credit to the Borrower. 
 B. The Borrower has not furnished to the Administrative Agent, as
required by Sections 5.04(a) and 5.04 (c) of the Credit Agreement, its consolidated financial statements with respect to the year ended December 31,2005, accompanied by the audit opinion and accountants’ certificate required by such
Sections (collectively, the “Financial Statements and Certificates”) and has not made any mandatory prepayment required by Section 2.13(d) of the Credit Agreement (the “2005 Excess Cash
Flow Payment”). 
 C. Further, the Borrower has informed the Administrative Agent that it intends to make an interest
payment in cash in respect of the Shareholder Notes in an aggregate amount of approximately $8,000,000 (the “Shareholder Notes Interest Payment”). Additionally, the Borrower has informed the Administrative Agent
that it intends to refinance all of its outstanding Shareholder Notes (the “Shareholder Notes Refinancing”) with the proceeds of Incremental Term Loans to be made pursuant to an Incremental Term Loan Assumption
Agreement in accordance with Section 2.24 of the Credit Agreement. 
 D. The Borrower has requested that the Requisite Lenders (as
defined below) (i) waive, until May 15, 2006, (A) compliance by the Borrower with Sections 5.04(a) and 5.04(c) of the Credit Agreement and (B) any Default or Event of Default that may have arisen solely as a result of the failure
of the Borrower to deliver to the Administrative Agent the Financial Statements and Certificates, (ii) waive (A) compliance by the Borrower with Section 2.13(d) of the Credit Agreement solely with respect to the 2005 Excess Cash Flow
Payment and (B) any Default or Event of Default that may have arisen solely as a result of the failure of the Borrower to make the 2005 Excess Cash Flow Payment and (iii) consent to the making of the Shareholder Notes Interest Payment on
or after the earlier to occur of (x) the date of the consummation of the Shareholder Notes Refinancing and (y) May 15, 2006 (such earlier date, the “Shareholder Notes Interest Payment Date”).

 E. The Requisite Lenders are willing so to consent and to grant such waivers on the terms and subject to the conditions set forth herein.

 F. Capitalized terms used but not defined herein shall have the meanings assigned to them in the Credit Agreement. 
 Accordingly, in consideration of the mutual agreements herein contained and other good and valuable consideration, the sufficiency and receipt of which
are hereby acknowledged, the parties hereto agree as follows: 

 SECTION 1. Consent. The Requisite hereby (a) consent to the making of the Shareholder
Notes Interest Payment on the terms described above on or after the Shareholder Notes Interest Payment Date, and (b) waive compliance by the Borrower with the provisions of Sections 6.09(b) and 6.09(c) of the Credit Agreement to the extent (but
only to the extent) necessary to permit the making of the Shareholder Notes Interest Payment on or after the Shareholder Notes Interest Payment Date. 
 SECTION 2. Waivers. (a) Pursuant to Section 9.08(b) of the Credit Agreement, the Requisite Lenders hereby waive: 
 (i) subject to clause (c) below, (A) compliance by the Borrower with Sections 5.04(a) and 5.04(c) of the Credit Agreement and
(B) any Default or Event of Default that may have arisen solely as a result of the failure of the Borrower to deliver to the Administrative Agent the Financial Statements and Certificate; and 
 (ii) (A) compliance by the Borrower with Section 2.13(d) of the Credit Agreement (solely with respect to the 2005 Excess Cash
Flow Payment) and (B) any Default or Event of Default that may have arisen solely as a result of the failure of the Borrower to make the 2005 Excess Cash Flow Payment. 
 (b) In no way shall the waivers set forth in clause (a)(i) above be deemed to be a waiver of any matter disclosed in the Financial Statements and
Certificates upon delivery thereof. 
 (c) The waivers set forth in clause (a)(i) above shall remain in effect through and including
May 15, 2006, after which time such waivers shall automatically terminate and be of no further force or effect, and all rights and remedies with respect to the matters set forth in clause (a)(i) hereof of the Administrative Agent, the
Collateral Agent and the Lenders under the Credit Agreement and any other Loan Document shall, without any further action by any person, automatically be reinstated as if such waivers set forth in clause (a)(i) hereof had not become effective.

 SECTION 3. Representations and Warranties. To induce the other parties hereto to enter into this Consent, the Borrower
represents and warrants to each of the Lenders, the Administrative Agent and the Issuing Bank that, alter giving effect to this Consent, (a) the representations and warranties set forth in Article Ill of the Credit Agreement are true and
correct in all material respects on and as of the date hereof, except to the extent such representations and warranties expressly relate to an earlier date and (b) no Default or Event of Default has occurred and is continuing. 
 SECTION 4. Effectiveness. This Consent shall become effective as of the date set forth above on the date that the Administrative Agent
shall have received counterparts of this Consent that, when taken together, bear the signatures of (a) the Borrower, (b) the Required Lenders and (c) Term Lenders holding a majority of the aggregate principal amount of outstanding Term
Loans (the Lenders described in clauses (b) and (c) being referred to herein as “Requisite Lender”). 
 SECTION 5. Effect of Consent, Waiver and Agreement. Except as expressly set forth herein, this Consent shall not by implication or otherwise limit, impair, constitute a waiver of, or otherwise affect the
rights and remedies of the Administrative Agent, the Collateral 

  

 2 

 
Agent, the Lenders or the Issuing Bank under the Credit Agreement or any other Loan Document, and shall not alter, modify, amend or in any way affect any of
the terms, conditions, obligations, covenants or agreements contained in the Credit Agreement or any other Loan Document, all of which are ratified and affirmed in all respects and shall continue in full force and effect. Nothing herein shall be
deemed to entitle any Loan Party to a consent to, or a waiver, amendment, modification or other change of, any of the terms, conditions, obligations, covenants or agreements contained in the Credit Agreement or any other Loan Document in similar or
different circumstances. After the date hereof, any reference to the Credit Agreement shall mean the Credit Agreement, as modified hereby. This Consent shall constitute a “Loan Document” for all purposes of the Credit Agreement and the
other Loan Documents. 
 SECTION 6. Counterparts. This Consent may be executed in any number of counterparts and by different
parties hereto in separate counterparts, each of which when so executed and delivered shall be deemed an original, but all such counterparts together shall constitute but one and the same contract. Delivery of an executed counterpart of a signature
page of this Consent by facsimile transmission shall be as effective as delivery of a manually executed counterpart hereof. 
 SECTION 7.
Applicable Law. THIS CONSENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK. 
 SECTION 8. Headings. The headings of this Consent are for purposes of reference only and shall not limit or otherwise affect the meaning hereof. 
 SECTION 9. Expenses. The Borrower agrees to reimburse the Administrative Agent for all out-of-pocket expenses in connection with this Consent, including the reasonable fees, charges and disbursements of
Cravath, Swaine & Moore LLP, counsel for the Administrative Agent. 
 SECTION 10. Acknowledgment of Subsidiary
Guarantors. Each of the Subsidiary Guarantors hereby acknowledges receipt and notice of, and consents to the terms of, this Consent. 
 [REMAINDER OF PAGE INTENTIONALLY BLANK] 
  

 3 

 IN WITNESS WHEREOF, the parties hereto have caused this Consent to be duly executed by their duly
authorized officers, all as of the date and year first above written. 
  

							
	DELTEK SYSTEMS, INC.,	 	
				
		 	By	 	 /s/ KEVIN T. PARKER
	 	
		 	Name:	 	KEVIN T. PARKER	 	
		 	Title:	 	PRESIDENT & CEO	 	
		
	DELTEK SYSTEMS (PHILIPPINES), LTD.	 	
				
		 	By:	 	 /s/ BABETTE J. ALLER
	 	
		 	Name:	 	BABETTE J. ALLER	 	
		 	Title:	 	SECRETARY	 	
		
	DELTEK SYSTEMS (COLORADO) INC.,	 	
				
		 	By	 	 /s/ BABETTE J. ALLER
	 	
		 	Name:	 	BABETTE J. ALLER	 	
		 	Title:	 	SECRETARY	 	
		
	WST CORPORATION,	 	
				
		 	By	 	 /s/ BABETTE J. ALLER
	 	
		 	Name	 	BABETTE J. ALLER	 	
		 	Title:	 	SECRETARY	 	
	
	CREDIT SUISSE, CAYMAN ISLANDS
BRANCH (formerly known as Credit Suisse First Boston, acting through its Cayman Islands Branch), individually and as Administrative
Agent,
				
		 	By	 	  
	 	
		 	Name:	 		 	
		 	Title:	 		 	
				
		 	By	 	  
	 	
		 	Name:	 		 	
		 	Title:	 		 	

  

 4 

 IN WITNESS WHEREOF, the parties hereto have caused this Consent to be duly executed by their duly
authorized officers, all as of the date and year first above written. 
  

							
	DELTEK SYSTEMS, INC.,	 	
				
		 	By	 	  
	 	
		 	Name:	 		 	
		 	Title:	 		 	
		
	DELTEK SYSTEMS (PHILIPPINES), LTD.	 	
				
		 	By	 	  
	 	
		 	Name:	 		 	
		 	Title:	 		 	
		
	DELTEK SYSTEMS (COLORADO) INC.,	 	
				
		 	By	 	  
	 	
		 	Name:	 		 	
		 	Title:	 		 	
		
	WST CORPORATION,	 	
				
		 	By	 	  
	 	
		 	Name:	 		 	
		 	Title:	 		 	
	
	CREDIT SUISSE, CAYMAN ISLANDS
BRANCH (formerly known as Credit Suisse First
Boston, acting through its Cayman Islands Branch),
individually and as Administrative
Agent,
				
		 	By:	 	 /s/ JAMES MORAN
	 	
		 	Name:	 	JAMES MORAN	 	
		 	Title:	 	MANAGING DIRECTOR	 	
				
		 	By:	 	 /s/ BENISE L. ALVAREZ
	 	
		 	Name:	 	BENISE L. ALVAREZ	 	
		 	Title:	 	ASSOCIATE	 	

  

 5 

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005 AS AMENDED 
  

							
	Name of Lender: JPMORGAN CHASE BANK, N.A.
				
		 		 	By:	 	 /s/ Christophe Vohmenn

		 		 	Name:	 	Christophe Vohmenn
		 		 	Title:	 	Vice President

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005 AS AMENDED 
  

									
	Name of Lender: Sun Trust Bank
					
		 		 		 	By:	 	 /s/ Brian Haggerty

		 		 		 	Name:	 	 Brian Haggerty

		 		 		 	Title:	 	Senior Vice President

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005 AS AMENDED 
  

					
	Name of Lender:	 	Wachovia Bank, N.A.
			
		 	By:	 	 /s/ Robert Savin

		 	Name:	 	Robert Savin
		 	Title:	 	Director

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005 AS AMENDED 
  

					
	Name of Lender:	 	 BABSON CLO LTD 2004-I
 BABSON CLO LTD
2004-II
 BABSON CLO LTD 2005-I
 By: Babson Capital Management LLC as
Collateral Manager

			
		 	By:	 	 /s/ Kent Collier

		 	Name:	 	Kent Collier
		 	Title:	 	Associate Director
		
		 	 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
 By: Babson Capital Management LLC as Investment Adviser

			
		 	By:	 	 /s/ Kent Collier

		 	Name:	 	Kent Collier
		 	Title:	 	Associate Director
		
		 	 BILL & MELINDA GATES
FOUNDATION
 By: Babson Capital Management LLC as
Investment Adviser

			
		 	By:	 	 /s/ Kent Collier

		 	Name:	 	Kent Collier
		 	Title:	 	Associate Director

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005 AS AMENDED 
  

					
	Name of Lender:	 	 Sankaty Advisors, LLC as Collateral

 Manager for AVERY POINT CLO,

 LTD., as Term Lender

			
		 	By:	 	 /s/ JEFFREY HAWKINS

		 	Name:	 	JEFFREY HAWKINS
		 	Title:	 	SENIOR VICE PRESIDENT

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005 AS AMENDED 
  

					
	Name of Lender:	 	 Sankaty Advisors, Inc., as Collateral

 Manager for Breast Point CBO

 1999-1 LTD., as Term Lender

			
		 	By:	 	 /s/ JEFFREY HAWKINS

		 	Name:	 	JEFFREY HAWKINS
		 	Title:	 	SENIOR VICE PRESIDENT

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005 AS AMENDED 
  

					
	Name of Lender:	 	 Sankaty Advisors, LLC as Collateral

 Manager for Castle Hill I -

 INGOTS, Ltd., as Term Lender

			
		 	By:	 	 /s/ JEFFREY HAWKINS

		 	Name:	 	JEFFREY HAWKINS
		 	Title:	 	SENIOR VICE PRESIDENT

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005 AS AMENDED 
  

					
	Name of Lender:	 	 Sankaty Advisors, LLC as Collateral

 Manager for Castle Hill II -

 INGOTS, Ltd., as Term Lender

			
		 	By:	 	 /s/ JEFFREY HAWKINS

		 	Name:	 	JEFFREY HAWKINS
		 	Title:	 	SENIOR VICE PRESIDENT

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005 AS AMENDED 
  

					
	Name of Lender:	 	 Sankaty Advisors, LLC as Collateral

 Manager for Castle Hill III CLO,

 Limited, as Term Lender

			
		 	By:	 	 /s/ JEFFREY HAWKINS

		 	Name:	 	JEFFREY HAWKINS
		 	Title:	 	SENIOR VICE PRESIDENT

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005 AS AMENDED 
  

					
	Name of Lender:	 	HARBOUR TOWN FUNDING LLC
			
		 	By:	 	 /s/ M. Cristina Higgins

		 	Name:	 	M. Cristina Higgins
		 	Title:	 	Assistant Vice President

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

					
	 Name of Lender:
	 	 Sankaty Advisors, LLC as Collateral
 Manager for Loan Funding XI LLC,
 As Term Lender

			
		 	By:	 	 /s/ JEFFREY HAWKINS

		 	Name:	 	JEFFREY HAWKINS
		 	Title:	 	SENIOR VICE PRESIDENT

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

					
	 Name of Lender:
	 	 Sankaty Advisors, LLC as Collateral
 Manager for Race Point CLO,
 Limited, as Term Lender

			
		 	By:	 	 /s/ JEFFREY HAWKINS

		 	Name:	 	JEFFREY HAWKINS
		 	Title:	 	SENIOR VICE PRESIDENT

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

					
	 Name of Lender:
	 	 Sankaty Advisors, LLC as Collateral
 Manager for Race Point II CLO,
 Limited, as Term Lender

			
		 	By:	 	 /s/ JEFFREY HAWKINS

		 	Name:	 	JEFFREY HAWKINS
		 	Title:	 	SENIOR VICE PRESIDENT

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005 AS AMENDED 
  

			
	Hewett’s Island CLO III, Ltd.
	By:	 	CypressTree Investment Management Company, Inc.,
as Portfolio Manager
		
	By:	 	 /s/ ROBERT E. WEEDEN

	Name:	 	ROBERT E. WEEDEN
	Title:	 	Managing Director

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006 RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

					
	 Name of Lender:
	 	 Denali Capital LLC, managing member of DC
 Funding Partners LLC, portfolio manager for
 DENALI CAPITAL CLO I, LTD., or an affiliate

			
		 	By:	 	 /s/ JOHN P. THACKER

		 	Name:	 	JOHN P. THACKER
		 	Title:	 	CHIEF CREDIT OFFICER

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 

					
		
	 Name of Lender:
	 	Denali Capital LLC, managing member of
DC Funding Partners LLC, portfolio manager for
DENALI CAPITAL CLO III, LTD., or an affiliate

  

							
				
		 		 	By	 	 /s/ JOHN E. THACKER

		 		 	Name:	 	JOHN E. THACKER
		 		 	Title:	 	CHIEF CREDIT OFFICER

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

							
		 	Name of Lender:	 	Denali Capital LLC, managing member of
DC Funding Partners LLC, portfolio manager for
DENALI CAPITAL CLO VI, LTD., or an affiliate
				
		 		 	By:	 	 /s/ JOHN E. THACKER

		 		 	Name:	 	JOHN E. THACKER
		 		 	Title:	 	CHIEF CREDIT OFFICER

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

					
			
		  	Name of Lender:	 	  

			
		  		 	FOUR CORNERS CLO 2005-I, LTD., is Lender
		  		 	 By: Four Corners Capital Management LLC,
        As Collateral Manager

			
		  		 	 /s/ DEAN VALENTINE

		  		 	DEAN VALENTINE
		  		 	Vice President
			
		  		 	FORTRESS PORTFOLIO TRUST., as Lender
		  		 	 By: Four Corners Capital Management LLC,
        As Investment Manager

			
		  		 	 /s/ DEAN VALENTINE

		  		 	DEAN VALENTINE
		  		 	Vice President

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

							
		 	 Name of Lender:
	 	SEMINOLE FUNDING LLC
				
		 		 	By	  	 /s/ M. Cristina Higgins

		 		 	Name:	  	M. Cristina Higgins
		 		 	Title:	  	Assistant Vice President

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

							
		 	Name of Lender:	 	Gleneagles CLO, Ltd.
By: Highland Capital Management, L.P., As Collateral Manager
By: Strand Advisor, Inc, Its General Partner
				
		 		 	By	 	 /s/ Chad Schramek

		 		 	Name:	 	Chad Schramek
		 		 	Title:	 	Assistant Treasurer
		 		 	 Strand Advisors, Inc., General Partner of
 Highland Capital Management, L.P.

	
	 SIGNATURE PAGE TO THE
 CONSENT AND WAIVER DATED
 AS OF APRIL 13, 2006, RELATING
 TO THE DELTEK SYSTEMS, INC.
 CREDIT AGREEMENT DATED AS
 OF APRIL 22, 2005, AS AMENDED
  

							
		 	 Name of Lender:
	 	Jasper CLO, Ltd.
By: Highland Capital Management, L.P., As Collateral Manager
By: Strand Advisor, Inc., Its General Partner
				
		 		 	By	 	 /s/ Chad Schramek

		 		 	Name:	 	Chad Schramek,
		 		 	Title:	 	Assistant Treasurer
		 		 	 Strand Advisors, Inc., General Partner of
 Highland Capital Management, L.P.

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

							
		 	 Name of Lender:
	 	Southfork CLO, Ltd.
By: Highland Capital Management, L.P., As Collateral Manager
By: Strand Advisor, Inc., Its General
Partner
				
		 		 	By	 	 /s/ Chad Schramek

		 		 	Name:	 	Chad Schramek
		 		 	Title:	 	Assistant Treasurer
		 		 	 Strand Advisors, Inc., General Partner of
 Highland Capital Management, L.P.

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

					
		 	Restoration Funding CLO, LTD.
		 	By: Highland Capital Management, L.P. As Collateral Manager
	Name of Lender:	 	By: Strand Advisor, Inc., Its General Partner
			
		 	By:	 	 /s/ Chad Schramek

		 	Name:	 	Chad Schramek,
		 	Title:	 	 Assistant Treasurer
 Strand Advisors, Inc., General
Partner of
 Highland Capital Management, L.P.

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

					
		 	Liberty CLO, Ltd.
		 	By: Highland Capital Management, L.P. As Collateral Manager
	Name of Lender:	 	By: Strand Advisor, Inc., Its General Partner
			
		 	By:	 	 /s/ Chad Schramek

		 	Name:	 	Chad Schramek,
		 	Title:	 	 Assistant Treasurer
 Strand Advisors, Inc., General
Partner of
 Highland Capital Management, L.P.

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

							
		  	Name of Lender:	  	Grayson CLO, Ltd.
By: Highland Capital Management, L.P., As Collateral Manager
By: Strand Advisor, Inc., Its General Partner
				
		  		  	 By:
	  	 /s/ Chad Schramek

		  		  	 Name:
	  	Chad Schramek,
		  		  	 Title:
	  	Assistant Treasurer
		  		  		  	 Strand Advisors, Inc., General Partner of
 Highland
Capital Management, L.P.

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

									
		  	Name of Lender:	 	SkyCBNA Loan Funding
				
		  		 	By:	 	 /s/ RUBEN DIAZ

		  		 	Name:	 	RUBEN DIAZ
		  		 	Title:	 	Authorized Signatory

			
	 Deyden IX – Senior Loan Fund 2005 p.l.c
 By: Prudential Investment Management,
 Inc., as attorney-in-fact

		
	By:	 	 /s/ Martha Tuttle

	Name:	 	Martha Tuttle
	Title:	 	Principal

			
	 Deyden VII – Leveraged Loan CDO 2004
 By: Prudential Investment Management,
 Inc., as Collateral Manager

		
	By:	 	 /s/ Martha Tuttle

	Name:	 	Martha Tuttle
	Title:	 	Principal

			
	 Loan Funding V, LLC, for itself or as agent
 For Corporate Loan Funding V LLC
 By: Prudential Investment Management,
 Inc., as Portfolio Manager

		
	By:	 	 /s/ Martha Tuttle

	Name:	 	Martha Tuttle
	Title:	 	Principal

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

					
	Name of Lender:	 	 ILLEGIBLE

			
		 	By:	 	 /s/ ILLEGIBLE

		 	Name:	 	ILLEGIBLE
		 	Title:	 	
		 		 	

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

													
		 	Name of Lender:	 	WELLS FARGO FOOTHILL	 	
					
		 		 	By:	 		 	/s/ ROBERT BERNER
		 		 	Name:	 		 	ROBERT BERNER
		 		 	Title:	 		 	VICE PRESIDENT

 SIGNATURE PAGE TO THE 
 CONSENT AND WAIVER DATED 
 AS OF APRIL 13, 2006, RELATING 
 TO THE DELTEK SYSTEMS, INC. 
 CREDIT AGREEMENT
DATED AS 
 OF APRIL 22, 2005, AS AMENDED 
  

							
		 	Name of Lender:	 	KC CLO II PLC
				
		 		 	By:	  	 /s/ ILLEGIBLE

		 		 	Name:	  	ILLEGIBLE
		 		 	Title:Exhibit 10.64

 Exhibit 10.64 
 EXECUTION COPY 
 SUBSIDIARY TRADEMARK SECURITY AGREEMENT (this “Agreement”)
dated as of July 24, 2006, between C/S SOLUTIONS, INC., a California corporation (the “Subsidiary Grantor”) and CREDIT SUISSE (formerly known as Credit Suisse First Boston and referred to herein as “Credit
Suisse”), as collateral agent (in such capacity, the “Collateral Agent”). 
 PRELIMINARY STATEMENT

 Reference is made to the Guarantee and Collateral Agreement dated as of April 22, 2005, as supplemented by Supplement No. 1
to Guarantee and Collateral Agreement dated as of October 3, 2005, Supplement No. 2 to Guarantee and Collateral Agreement dated as of March 17, 2006 and Supplement No. 3 to Guarantee and Collateral Agreement dated as of
July 24, 2006 (as the same may be further amended, restated, supplemented or otherwise modified from time to time, the “Guarantee and Collateral Agreement”), among Deltek Systems, Inc. (the
“Borrower”), the subsidiaries of the Borrower identified therein and the Collateral Agent. The Lenders have agreed to make Loans and the Issuing Bank has agreed to issue Letters of Credit, in each case subject to the terms
and conditions set forth in the Credit Agreement dated as of April 22, 2005, (as the same may be amended, restated, supplemented or otherwise modified from time to time, the “Credit Agreement”), among the Borrower, the
lenders named therein and Credit Suisse, as administrative agent and as the Collateral Agent. The Subsidiary Grantor is executing this Agreement in accordance with the requirements of the Credit Agreement to become a Subsidiary Guarantor and a
Grantor under the Guarantee and Collateral Agreement in order to induce the Lenders to make additional Loans and the Issuing Bank to issue additional Letters of Credit and as consideration for Loans previously made and Letters of Credit previously
issued. The Subsidiary Grantor is an affiliate of the Borrower, will derive substantial benefits from the extension of credit to the Borrower pursuant to the Credit Agreement and is willing to execute and deliver this Agreement in order to induce
the Lenders to continue to make additional Loans and the Issuing Bank to issue additional Letters of Credit. 
 Accordingly, in consideration
of the premises and mutual covenants herein contained and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Subsidiary Grantor hereby agrees as follows: 
 SECTION 1. DEFINED TERMS. All capitalized terms used but not otherwise defined herein have the meanings given to them in the Credit Agreement or
the Guarantee and Collateral Agreement, as applicable. 
 SECTION 2. GRANT OF SECURITY INTEREST IN TRADEMARK COLLATERAL. The
Subsidiary Grantor hereby assigns and pledges to the Collateral Agent (and its successors and assigns), for the ratable benefit of the Secured Parties, and hereby grants to the Collateral Agent (and its successors and assigns), for the ratable
benefit of Secured Parties, a continuing security interest in all of the Subsidiary Grantor’s right, title and interest in, to and under the following, whether presently existing or hereafter created or acquired (collectively, the
“Trademark Collateral”): 
 (a) all of its Trademarks and Trademark Licenses to which it is a party,
including those referred to on Schedule I hereto; 

 (b) all reissues, continuations or extensions of the foregoing; 
 (c) all products and proceeds of the foregoing, including, without limitation, any claim by the Subsidiary Grantor against third parties
for past, present or future infringement or dilution of any Trademark or any Trademark licensed under any Trademark License. 
 SECTION 3.
GUARANTEE AND COLLATERAL AGREEMENT. The security interests granted pursuant to this Agreement are granted in conjunction with the security interests granted to the Collateral Agent (and its successors and assigns), for the ratable benefit of
the Secured Parties, pursuant to the Guarantee and Collateral Agreement. The parties hereto hereby acknowledge and affirm that the rights and remedies of the Collateral Agent with respect to the security interest in the Trademark Collateral made and
granted hereby are more fully set forth in the Guarantee and Collateral Agreement, the terms and provisions of which are incorporated by reference herein as if fully set forth herein, and that the Trademark Collateral shall not include any
collateral excluded under Section 4.01(a) of the Guarantee and Collateral Agreement. 
 [Remainder of page intentionally blank]

 IN WITNESS WHEREOF, the Subsidiary Grantor has caused this Subsidiary Trademark Security Agreement to be
executed and delivered by its duly authorized officer as of the date first set forth above. 
  

			
	C/S SOLUTIONS, INC.
		
	by	 	/s/ David R. Schwiesow
		 	Name: David R. Schwiesow
		 	Title: Secretary

 ACCEPTED AND ACKNOWLEDGED BY: 
  

			
	CREDIT SUISSE, CAYMAN ISLANDS BRANCH (formerly known as Credit Suisse First Boston, acting through its Cayman Islands Branch), as Collateral Agent,
		
	By	 	/s/ James Moran
		 	Name: James Moran
		 	Title: Managing Director

  

			
		
	By	 	/s/ Denise L. Alvarez
		 	Name: Denise L. Alvarez
		 	Title: Associate

 SCHEDULE I 
 TO 
 SUBSIDIARY TRADEMARK SECURITY AGREEMENT 
 U.S. Trademark Registrations 
  

					
	 Mark
	  	 Reg. Date
	  	 Reg. No.

	 wInsight
	  	8/5/03	  	2746672
	 Risk+
	  	4/25/00	  	2344552
	 C/S Glue
	  	1/1/02	  	2523824

 U.S. Trademark Applications 
  

					
	 Mark
	  	 Filing Date
	  	 Application No.

	 Project Connect
	  	7/4/05	  	78663378
	 Briefing Wizard
	  	7/4/05	  	78663379

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