Document:

Specimen Unit Certificate

 EX-4.1 
 SPECIMEN UNIT CERTIFICATE 
  

			
	 NUMBER
	  	UNITS
	U-                            	  	 

  
 See
Reverse for 
 certain definitions 
  

SAND HILL IT SECURITY ACQUISITION CORP. 
  
 CUSIP 799719 20 8 
  
 UNITS CONSISTING OF ONE SHARE OF COMMON STOCK AND TWO 
 WARRANTS 
 EACH TO PURCHASE ONE SHARE OF COMMON STOCK 
  
 THIS CERTIFIES
THAT                                       
                                        
                                        
                      is the owner of
                                        
                                        
                                        
                        Units. 
  
 Each Unit (“Unit”) consists of one (1) share of common stock, par value $.01 per share (“Common Stock”), of Sand Hill IT Security Acquisition Corp., a
Delaware corporation (the “Company”), and two warrants (the “Warrants”). Each Warrant entitles the holder to purchase one (1) share of Common Stock for $5.00 per share (subject to adjustment). Each Warrant will become exercisable
on the later of the Company’s completion of a business combination or             , 2004 and will expire unless exercised before 5:00 p.m., New York City Time, on
            , 2009, or earlier upon redemption (the “Expiration Date”). The Common Stock and Warrants comprising the Units represented by this certificate are not
transferable separately prior to             , 2004, subject to earlier separation in the discretion of Newbridge Securities Corporation and I-Bankers Securities Incorporated. The
terms of the Warrants are governed by a Warrant Agreement, dated as of             , 2004, between the Company and American Stock Transfer & Trust Company, as Warrant Agent, and
are subject to the terms and provisions contained therein, all of which terms and provisions the holder of this certificate consents to by acceptance hereof. Copies of the Warrant Agreement are on file at the office of the Warrant Agent at
                    , and are available to any Warrant holder on written request and without cost. 
  
 This certificate is not valid unless countersigned by the Transfer Agent and
Registrar of the Company. 
  
 Witness the facsimile seal of the
Company and the facsimile signature of its duly authorized officers. 
  

 By 
  
 SAND HILL IT SECURITY ACQUISITION CORP. 
 CORPORATE 
 SEAL 
 2004 
  
 DELAWARE 
  

					
	 	 	 	 	 
	 Chairman of the Board
	 	 	 	 Secretary

  
 SAND HILL IT SECURITY
ACQUISITION CORP. 
  
 The Company will furnish without charge to
each stockholder who so requests, a statement of the powers, designations, preferences and relative, participating, optional or other special rights of each class of stock or series thereof of the Company and the qualifications, limitations, or
restrictions of such preferences and/or rights. 
  
 The following
abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: 
  
 TEN COM - as tenants in common 
 TEN ENT - as tenants by the entireties 
 JT TEN - as joint tenants with right of survivorship and not as
tenants in common 
 UNIF GIFT MIN ACT-             Custodian
            under Uniform Gifts to
                                       
 (Cust)                  (Minor)        Minors Act
             
                                        
                                        
                              (state) 
  
 Additional Abbreviations may also be used though not in the above list. 
  
 For value received,              hereby sell, assign and
transfer unto 
  
 PLEASE INSERT SOCIAL SECURITY OR OTHER 
 IDENTIFYING NUMBER OF ASSIGNEE 
  
 ———————————————————— 
  
 ———————————————————— 
  

                                       
                                        
                                        
                                        
                                        
                    
 (PLEASE PRINT OR
TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE) 
  
                                       
                                        
                                        
                                        
                                        
                    
  
                                       
                                        
                                        
                                        
                                        
                    
  
 ___________________________________________________________________________________ Units represented by the within Certificate, and do hereby irrevocably constitute and
appoint 
                                       
                                        
                                        
                                        
                                        
                    
 Attorney to transfer the said Units
on the books of the within named Company will full power of substitution in the premises. 
  
 Dated                             
  
 NOTICE: The signature to this assignment must correspond with the name as
written upon he face of the certificate in every particular, without alteration or enlargement or any change whatever. 
  
 Signature(s) Guaranteed: 
  
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 THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION
(BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15. 
  
 KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN, MUTILATED OR DESTROYED, THE COMPANY WILL REQUIRE A BOND OF INDEMNITY AS A
CONDITION TO THE ISSUANCE OF A REPLACEMENT CERTIFICATE.Specimen Warrant Certificate

 EX-4.3 
 SPECIMEN WARRANT
CERTIFICATE 
  

					
	NUMBER	 	(SEE REVERSE LEGEND)	 	WARRANTS

  
 (THIS WARRANT WILL BE
VOID IF NOT EXERCISED PRIOR 
 TO 5:00 P.M. NEW YORK CITY TIME,
            , 2009 
  
 SAND HILL IT SECURITY ACQUISITION CORP. 
 CUSIP 799719 11 7 
 WARRANT 
  
 THIS CERTIFIES THAT, for value received                      is the registered holder of a Warrant or Warrants
expiring                     , 2009 (the “Warrant”) to purchase one fully paid and non-assessable share of Common Stock, par value
$.01 per share (“Shares”), of Sand Hill IT Security Acquisition Corp., a Delaware corporation (the “Company”) for each Warrant evidenced by this Warrant Certificate. The Warrant entitles the holder thereof to purchase from the
Company, commencing on the later of (i) the consummation by the Company of a merger, capital stock exchange, asset acquisition or other similar business combination or (ii)
                    , 2004, such number of Shares of the Company at the price of $5.00 per share, upon surrender of this Warrant Certificate
and payment of the Warrant Price at the office or agency of the Warrant Agent, American Stock Transfer & Trust Company (such payment to be made by check made payable to the Warrant Agent), but only subject to the conditions set forth herein and
in the Warrant Agreement between the Company and American Stock Transfer & Trust Company. The Warrant Agreement provides that upon the occurrence of certain events the Warrant Price and the number of Warrant Shares purchasable hereunder, set
forth on the face hereof, may, subject to certain conditions, be adjusted. The term Warrant Price as used in this Warrant Certificate refers to the price per Share at which Shares may be purchased at the time the Warrant is exercised. 
  
 No fraction of a Share will be issued upon any exercise of a Warrant. If the
holder of a Warrant would be entitled to receive a fraction of a Share upon any exercise of a Warrant, the Company shall, upon such exercise, round up to the nearest whole number the number of Shares to be issued to such holder. 
  
 Upon any exercise of the Warrant for less than the total number of full
Shares provided for herein, there shall be issued to the registered holder hereof or his assignee a new Warrant Certificate covering the number of Shares for which the Warrant has not been exercised. 
  
 Warrant Certificates, when surrendered at the office or agency of the Warrant
Agent by the registered holder hereof in person or by attorney duly authorized in writing, may be exchanged in the manner and subject to the limitations provided in the Warrant 

  

 
Agreement, but without payment of any service charge, for another Warrant Certificate or Warrant Certificates of like tenor and evidencing in the aggregate a
like number of Warrants. 
  
 Upon due presentment for registration
of transfer of the Warrant Certificate at the office or agency of the Warrant Agent, a new Warrant Certificate or Warrant Certificates of like tenor and evidencing in the aggregate a like number of Warrants shall be issued to the transferee in
exchange for this Warrant Certificate, subject to the limitations provided in the Warrant Agreement, without charge except for any applicable tax or other governmental charge. 
  
 The Company and the Warrant Agent may deem and treat the registered holder as the absolute owner of this Warrant Certificate
(notwithstanding any notation of ownership or other writing hereon made by anyone), for the purpose of any exercise hereof, of any distribution to the registered holder, and for all other purposes, and neither the Company nor the Warrant Agent shall
be affected by any notice to the contrary. 
  
 This Warrant does
not entitle the registered holder to any of the rights of a Stockholder of the Company until exercised. 
  
 The Company reserves the right to call the Warrant, at any time prior to its exercise, with a notice of call in writing to the Warrantholders of Record,
giving 30 days’ notice of such call at any time after the Warrant becomes exercisable if the last sale price of the Shares has been at least $8.50 per share on each of 20 trading days within any 30 trading day period ending on the third
business day prior to the date on which notice of such call is given. The call price of the Warrants is to be $.01 per Warrant. Any Warrant either not exercised, or tendered back to the Company by the end of the date specified in the notice of call,
shall be canceled on the books of the Company and have no further value except for the $.01 call price. 
  

					
	 By:
	 	 	 	 
			
	  	 	 	 	  
	 Secretary
	 	 	 	 Chairman of the Board

  

 SUBSCRIPTION FORM 
 To Be Executed by the Registered Holder in Order to Exercise Warrants 
  
 The undersigned Registered Holder irrevocably elects to exercise                      Warrants represented by
this Warrant Certificate, and to purchase the shares of Common Stock issuable upon the exercise of such Warrants, and requests that Certificates for such shares shall be issued in the name of 
  
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 (PLEASE TYPE OR PRINT NAME AND ADDRESS) 
  
 ————————————————————————————————————————

  
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 (SOCIAL SECURITY OR TAX IDENTIFICATION NUMBER) 
  
 and be delivered to 
  
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 (PLEASE PRINT OR TYPE NAME AND ADDRESS) 
  
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 and, if such number of Warrants shall not be all the Warrants evidenced by
this Warrant Certificate, that a new Warrant Certificate for the balance of such Warrants be registered in the name of, and delivered to, the Registered Holder at the address stated below: 
  

					
			
	 Dated:
                                        
                
	 	 	 	 
	  	 	 	 	 (SIGNATURE)

			
	 	 	 	 	 
	  	 	 	 	 (ADDRESS)

			
	  	 	 	 	  
			
	  	 	 	 	  
	  	 	 (TAX IDENTIFICATION NUMBER)

  

 ASSIGNMENT 
 To Be Executed by the Registered Holder in Order to Assign Warrants 
  
 For Value Received,                      hereby sell, assign, and transfer unto 
  
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 (PLEASE TYPE OR PRINT NAME AND ADDRESS) 
  
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 ————————————————————————————————————————

  
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 (SOCIAL SECURITY OR TAX IDENTIFICATION NUMBER) 
  
 and be delivered to 
  
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 (PLEASE PRINT OR TYPE NAME AND ADDRESS) 
  
                                       
       of the Warrants represented by this Warrant Certificate, and hereby irrevocably constitute and appoint
                                        
                     Attorney to transfer this Warrant Certificate on the books of the Company, with full power of substitution in the premises.

  

					
			
	 Dated:
                                        
                
	 	 	 	 
	  	 	 	 	 (SIGNATURE)

  
 THE SIGNATURE TO THE ASSIGNMENT OF THE
SUBSCRIPTION FORM MUST CORRESPOND TO THE NAME WRITTEN UPON THE FACE OF THIS WARRANT CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATSOEVER, AND MUST BE GUARANTEED BY A COMMERCIAL BANK OR TRUST COMPANY OR A MEMBER
FIRM OF THE AMERICAN STOCK EXCHANGE, NEW YORK STOCK EXCHANGE, PACIFIC STOCK EXCHANGE OR CHICAGO STOCK EXCHANGE.

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