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Exhibit 4.2    
    

	No.                        	 	 	 	 
	

Cusip No. 89468P 10 2	
 	

 	
 	

                         Shares
	TC Acquisition Corp.
 Incorporated under the Laws of the State of Delaware
	
Common Stock

Par Value $0.0001 per Share
	
SEE REVERSE FOR CERTAIN DEFINITIONS
	
	 	 	 	 

THIS CERTIFIES THAT
                                         
                                         
                                   IS THE OWNER OF
                                   FULLY
PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, WITH A PAR VALUE $0.0001 PER SHARE, OF TC ACQUISITION CORP., a Delaware corporation (the "Corporation"), transferable on the books of the Corporation in
person or by duly authorized attorney upon surrender of this certificate if properly endorsed. This certificate is not valid unless countersigned by the Transfer Agent and registered by Registrar.  

WITNESS the seal of the Corporation and the facsimile signature of its duly authorized officers.  

	Dated:	 	 	 	 	 
	 	
	 	 	 	 
	

 Secretary	
 	

 	
 	

 Chief Executive Officer
	

 Transfer Agent	
 	

 	
 	

 
	

 	
 	

TC Acquisition Corp.

CORPORATE SEAL

2005

DELAWARE	
 	

 

        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	 	Unif Gift Min Act -	                        	Custodian	                        
	TEN ENT	 	tenants by the entireties	 	 	(Cust)	 	(Minor)
	JT TEN	 	as joint tenants with right of	 	 	Under Uniform Gifts to Minors
	 	 	survivorship and not as tenants in common	 	 	Act:
                                         
                 
	 	 	 	 	 	(State)
	

Additional abbreviations may also be used though not in the above list.

TC Acquisition Corp.  

        The Corporation will furnish without charge to each stockholder who so requests the powers, designations, preferences and relative, participating,
option or other special rights of each class of stock or series thereof of the Corporation and the qualifications, limitations, or restrictions of such preferences and/or rights. This certificate and
the Units represented hereby are issued and shall be held subject to the terms and conditions applicable to the securities underlying and comprising the Units. 

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 Corporation with full power of substitution in the premises.

	Dated
                                         
                 	 	By:
                                         
                 
	 	 	NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.
	Signature(s) Guaranteed:	 	 
	

By:
                                         
                 	
 	

 
	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).	 	 

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Exhibit 4.3    
    

EXHIBIT A  

 [FORM OF WARRANT CERTIFICATE]  

        THIS
WARRANT CERTIFICATE (I) CANNOT BE TRANSFERRED OR EXCHANGED UNTIL THE 20TH TRADING DAY AFTER THE EARLIER TO OCCUR OF THE EXPIRATION OF THE UNDERWRITERS' OPTION
TO PURCHASE UP TO 900,000 ADDITIONAL UNITS TO COVER OVER-ALLOTMENTS AND THE EXERCISE IN FULL BY THE UNDERWRITERS OF SUCH OPTION, BUT IN NO EVENT WILL SEPARATE TRADING OF THE SECURITIES
COMPRISING THE UNITS BE ALLOWED UNTIL TC ACQUISITION CORP. (THE "COMPANY") FILES (A) AN AUDITED BALANCE SHEET REFLECTING THE RECEIPT BY THE COMPANY OF THE GROSS PROCEEDS OF THE OFFERING AND
(B) A CURRENT REPORT ON FORM 8-K AND ISSUES A PRESS RELEASE ANNOUNCING WHEN SUCH SEPARATE TRADING WILL BEGIN (THE "DETACHMENT DATE") UNLESS INCLUDED WITH A SHARE OF COMMON STOCK OF THE
COMPANY AS PART OF A UNIT AND (II) CANNOT BE EXERCISED UNTIL THE LATER OF THE COMPANY'S COMPLETION OF A BUSINESS COMBINATION AND                , 2007. 

EXERCISABLE
ONLY IF COUNTERSIGNED BY THE WARRANT

AGENT AS PROVIDED HEREIN. 

Warrant
Certificate evidencing 

Warrants
to Purchase 

Common
Stock, par value $.0001 

As
described herein. 

TC
Acquisition Corp. 

	No.	 
	 	CUSIP No.	89468P 11 0

VOID AFTER 5:00 P.M., NEW YORK TIME,

ON                , 2011 (AS SUCH PERIOD MAY BE EXTENDED

PURSUANT TO THIS WARRANT CERTIFICATE), OR UPON EARLIER REDEMPTION  

        This certifies that                        or registered assigns
is the registered holder of                        warrants to purchase certain securities (each a
"Warrant"). Each Warrant entitles the holder thereof, subject to the provisions contained herein and in the Warrant Agreement (as defined below), to
purchase from TC Acquisition Corp., a Delaware corporation (the "Company"), one share of the Company's Common Stock (each, a
"Share"), at the Exercise Price set forth below. The exercise price of each Warrant (the "Exercise
Price") shall be $5.00 initially, subject to adjustments as set forth in the Warrant Agreement (as defined below). 

        Subject
to the terms of the Warrant Agreement, each Warrant evidenced hereby may be exercised in whole but not in part at any time, as specified herein, on any Business Day (as defined
below) occurring during the period (the "Exercise Period") commencing on the later of the Company's completion of a Business Combination (as defined
below) or                , 2007 and ending on the earlier to occur of 5:00 P.M., New York time,
on                , 2011; provided that if, during the period in
which the warrants are exercisable, a registration statement under the Securities Act of 1933, as amended (the "Securities Act"), relating to the shares
of common stock issuable upon exercise of the warrants is not effective, or a prospectus relating to the shares of common stock issuable upon exercise of the warrants is not available for use, the
expiration date for the warrants will be extended by the number of days during which such a registration statement was not effective or such prospectus was not available for 

 

use
(the date on which the Exercise Period terminates, the "Expiration Date"). Each Warrant remaining unexercised after 5:00 P.M., New York time,
on the Expiration Date shall become void, and all rights of the holder of this Warrant Certificate evidencing such Warrant shall cease. 

        The
holder of the Warrants represented by this Warrant Certificate may exercise any Warrant evidenced hereby by delivering, not later than 5:00 P.M., New York time, on any
Business Day during the Exercise Period (the "Exercise Date") to Continental Stock Transfer & Trust Company (the "Warrant
Agent", which term includes any successor warrant agent under the Warrant Agreement described below) at its corporate trust department at 17 Battery Place, New York, NY 10004,
(i) this Warrant Certificate or, in the case of a Book-Entry Warrant Certificate (as defined in the Warrant Agreement), the Warrants to be exercised (the
"Book-Entry Warrants") free on the records of The Depository Trust Company (the
"Depository") to an account of the Warrant Agent at the Depository designated for such purpose in writing by the Warrant Agent to the Depository,
(ii) an election to purchase ("Election to Purchase"), properly executed by the holder hereof on the reverse of this Warrant Certificate or
properly executed by the institution in whose account the Warrant is recorded on the records of the Depository (the "Participant"), and substantially in
the form included on the reverse of this Warrant Certificate and (iii) the Exercise Price for each Warrant to be exercised in lawful money of the United States of America by certified or
official bank check or by bank wire transfer in immediately available funds. If any of (a) this Warrant Certificate or the Book-Entry Warrants, (b) the Election to Purchase,
or (c) the Exercise Price therefor, is received by the Warrant Agent after 5:00 P.M., New York time, on the specified Exercise Date, the Warrants will be deemed to be received and
exercised on the Business Day next succeeding the Exercise Date. If the date specified as the Exercise Date is not a Business Day, the Warrants will be deemed to be received and exercised on the next
succeeding day which is a Business Day. If the Warrants to be exercised are received or deemed to be received after the Expiration Date, the exercise thereof will be null and void and any funds
delivered to the Warrant Agent will be returned to the holder as soon as practicable. In no event will interest accrue on funds deposited with the Warrant Agent in respect of an exercise or attempted
exercise of Warrants. The validity of any exercise of Warrants will be determined by the Warrant Agent in its sole discretion and such determination will be final and binding upon the holder of the
Warrants and the Company. Neither the Warrant Agent nor the Company shall have any obligation to inform a holder of Warrants of the invalidity of any exercise of Warrants. Notwithstanding the
foregoing, the Company shall not be obligated to deliver any securities pursuant to the exercise of a Warrant unless a
registration statement under the Securities Act with respect to the Shares issuable upon exercise of the Warrants is effective (and the prospectus contained therein is available for use). Warrants may
not be exercised by, or securities issued to, any Registered Holder in any state in which such exercise would be unlawful. The exercise of the Warrants may only be settled by delivery of Shares and
the holders of the Warrants shall not be entitled to the payment of cash in lieu of Shares (net cash settlement) upon exercise of the Warrants pursuant to the terms of the Warrant Agreement or this
Warrant Certificate regardless of whether the Shares underlying the Warrants are registered pursuant to an effective registration statement (and a prospectus relating thereto is available for use). 

        As
used herein, the term "Business Day" means any day that is not a Saturday or Sunday and is not a United States federal holiday or a day
on which banking institutions generally are authorized or obligated by law or regulation to close in New York. 

        As
used herein, the term "Business Combination" shall mean the acquisition by the Company, whether by merger, capital stock exchange,
asset or stock acquisition or other similar business combination of one or more operating businesses in the technology-related sector (collectively, the "Target
Business") having, individually or collectively, a fair market value (as calculated in accordance with the Company's Certificate of Incorporation) at least equal to 80% of the
Company's net assets at the time of such merger, capital stock exchange, asset acquisition or other similar business combination; 

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 provided, that any acquisition of multiple operating businesses shall occur contemporaneously with one another. 

        Warrants
may be exercised only in whole numbers of Warrants. No fractional shares of Common Stock are to be issued upon the exercise of this Warrant, but rather the number of shares of
Common Stock to be issued shall be rounded up to the nearest whole number. If fewer than all of the Warrants evidenced by this Warrant Certificate are exercised, a new Warrant Certificate for the
number of Warrants remaining unexercised shall be executed by the Company and countersigned by the Warrant Agent as provided in Section 2 of the Warrant Agreement, and delivered to the holder
of this Warrant Certificate at the address specified on the books of the Warrant Agent or as otherwise specified by such Registered Holder. 

        This
Warrant Certificate is issued under and in accordance with the Warrant Agreement, dated as of                , 2006 (the "Warrant
Agreement"), between the Company and the Warrant Agent and is subject to the terms and provisions contained in the Warrant Agreement, to all of which terms and provisions the
holder of this Warrant Certificate and the beneficial owners of the Warrants represented by this Warrant Certificate consent by acceptance hereof. Copies of the Warrant Agreement are on file and can
be inspected at the above-mentioned office of the Warrant Agent and at the office of the Company at 1816 Fifth Street, Berkeley, California 94710. 

        At
any time during the Exercise Period, the Company may, at its sole option, redeem all (but not part) of the then outstanding Warrants upon giving notice in accordance with the terms of
the Warrant Agreement (the "Redemption Notice"), at the price of $0.01 per Warrant (the "Redemption
Price"); provided, that (a) the last sales price of the Shares has been at least $8.50 per Share, for any twenty
(20) trading days within a thirty (30) trading day period ending on the third Business Day prior to the date on which the Redemption Notice is sent by the Company and (b) a
registration statement under the Securities Act relating to the shares of common stock issuable upon exercise of the then outstanding Warrants is effective and expected to remain effective to and
including the redemption date and a prospectus relating to the shares of common stock issuable upon exercise of the then outstanding Warrants is available for use and expected to remain available for
use to and including the redemption date. In the event the Company shall elect to redeem all the then outstanding Warrants, the Company shall fix a date for such redemption, which such date shall be
at least thirty (30) days after the date the Redemption Notice is sent (the "Redemption Date");  provided, that such date shall occur prior the
expiration of the Exercise Period. The Warrants may be exercised in accordance with the terms of this
Agreement at any time after a Redemption Notice shall have been given by the Company; provided, however,
that no Warrants may be exercised subsequent to the Expiration Date; provided, further, that all rights
whatsoever with respect to the Warrants shall cease on the Redemption Date, other than to the right to receive the Redemption Price. 

        The
accrual of dividends, if any, on the Shares issued upon the valid exercise of any Warrant will be governed by the terms generally applicable to such Shares. From and after the
issuance of such Shares, the former holder of the Warrants exercised will be entitled to the benefits generally available to other holders of Shares and such former holder's right to receive payments
of dividends and any other amounts payable in respect of the Shares shall be governed by, and shall be subject to, the terms and provisions generally applicable to such Shares. 

        The
Exercise Price and the number of Shares purchasable upon the exercise of each Warrant shall be subject to adjustment as provided pursuant to Section 4 of the Warrant
Agreement. 

        Prior
to the Detachment Date, the Warrants represented by this Warrant Certificate may be exchanged or transferred only together with the Shares to which such Warrant is attached
(together, a "Unit"), and only for the purpose of effecting, or in conjunction with, an exchange or transfer of such Unit. Additionally, prior to the
Detachment Date, each transfer of such Unit on the register of the Units shall operate also to transfer the Warrants included in such Units. From and after the 

3

 

Detachment
Date, the above provisions in this paragraph shall be of no further force and effect. Upon due presentment for registration of transfer or exchange of this Warrant Certificate at the stock
transfer division of the Warrant Agent, the Company shall execute, and the Warrant Agent shall countersign and deliver, as provided in Section 5 of the Warrant Agreement, in the name of the
designated transferee one or more new Warrant Certificates of any authorized denomination evidencing in the aggregate a like number of unexercised Warrants, subject to the limitations provided in the
Warrant Agreement. 

        Neither
this Warrant Certificate nor the Warrants evidenced hereby shall entitle the holder hereof or thereof to any of the rights of a holder of the Shares, including, without
limitation, the right to receive dividends, if any, or payments upon the liquidation, dissolution or winding up of the Company or to exercise voting rights, if any. 

        The
Warrant Agreement and this Warrant Certificate may be amended as provided in the Warrant Agreement including, under certain circumstances described therein, without the consent of
the holder of this Warrant Certificate or the Warrants evidenced thereby. 

        THIS WARRANT CERTIFICATE AND ALL RIGHTS HEREUNDER AND UNDER THE WARRANT AGREEMENT SHALL BE GOVERNED BY AND INTERPRETED AND CONSTRUED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF NEW YORK APPLICABLE TO CONTRACTS FORMED AND TO BE PERFORMED ENTIRELY WITHIN THE STATE OF NEW YORK, WITHOUT REGARD TO THE CONFLICTS OF LAW PROVISIONS THEREOF TO THE EXTENT SUCH
PRINCIPLES OR RULES WOULD REQUIRE OR PERMIT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION.

        This
Warrant Certificate shall not be entitled to any benefit under the Warrant Agreement or be valid or obligatory for any purpose, and no Warrant evidenced hereby may be exercised,
unless this Warrant Certificate has been countersigned by the manual signature of the Warrant Agent. 

        IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed. 

Dated
as of                 , 2006 

	 	 	TC Acquisition Corp.
	

 	
 	

By:	

 
 Name: Robert J. Majteles

Title: President and Chief Executive Officer

	Continental Stock Transfer & Trust Company,

        as Warrant Agent	 
	

By:	

 
	

 
	Name:

Title:	 

4

   [REVERSE] 

Instructions for Exercise of Warrant  

        To exercise the Warrants evidenced hereby, the holder or Participant must, by 5:00 P.M., New York time, on the specified Exercise Date, deliver to the
Warrant Agent at its stock transfer division, a certified or official bank check or a bank wire transfer in immediately available funds, in each case payable to the Warrant Agent at an account
designated by the Warrant Agent, in an amount equal to the Exercise Price in full for the Warrants exercised. In addition, the Warrant holder or Participant must provide the information required below
and deliver this Warrant Certificate to the Warrant Agent at the address set forth below and the Book-Entry Warrants to the Warrant Agent in its account with the Depository designated for
such purpose. The Warrant Certificate and this Election to Purchase must be received by the Warrant Agent by 5:00 P.M., New York time, on the specified Exercise Date. 

ELECTION TO PURCHASE

TO BE EXECUTED IF WARRANT HOLDER DESIRES

TO EXERCISE THE WARRANTS EVIDENCED HEREBY 

        The
undersigned hereby irrevocably elects to exercise, on                        ,
            (the "Exercise Date"),
                        
Warrants, evidenced by this Warrant Certificate, to purchase,                        of the shares of Common Stock (each, a
"Share") of TC Acquisition Corp., a
Delaware corporation (the "Company"), and represents that on or before the Exercise Date such holder has tendered payment for such Shares by certified
or official bank check or bank wire transfer in immediately available funds to the order of the Company c/o Continental Stock Transfer & Trust Company, 17 Battery Place, New York, New York
10004, in the amount of $                        in accordance with the terms hereof. The undersigned requests that said number of
Shares be in fully registered form, registered in such names and delivered,
all as specified in accordance with the instructions set forth below. 

        If
said number of Shares is less than all of the Shares purchasable hereunder, the undersigned requests that a new Warrant Certificate evidencing the remaining balance of the Warrants
evidenced hereby be issued and delivered to the holder of the Warrant Certificate unless otherwise specified in the instructions below. 

Dated:
                             ,         

	Name	 	 	 	 
	 	 	
 (Please Print)	 	 
	

/      /      /      / - /      /      / - /      /
      /      /      /
 (Insert Social Security or Other Identifying Number of Holder)	
 	

 
	

Address	
 	

 	
 	

 
	 	 	
	 	 
	 	 	    
	 	 
	

Signature	
 	

 	
 	

 
	 	 	
	 	 

5

 

This
Warrant may only be exercised by presentation to the Warrant Agent at one of the following locations: 

        By
hand at: 

        By
mail at: 

The
method of delivery of this Warrant Certificate is at the option and risk of the exercising holder and the delivery of this Warrant Certificate will be deemed to be made only when actually received
by the Warrant Agent. If delivery is by mail, registered mail with return receipt requested, properly insured, is recommended. In all cases, sufficient time should be allowed to assure timely
delivery. 

(Instructions
as to form and delivery of Shares and/or Warrant Certificates) 

	Name in which Shares are to be registered if other than in the name of the registered holder of this Warrant Certificate:	 	 
	 	 	 	 	 	

	

Address to which Shares are to be mailed if other than to the address of the registered holder of this Warrant Certificate as shown on the books of the Warrant Agent:	
 	

 
	 	 	 	 	 	
 (Street Address)
	 	 	 	 	 	    
 (City and State) (Zip Code)
	

Name in which Warrant Certificate evidencing unexercised Warrants, if any, are to be registered if other than in the name of the registered holder of this Warrant Certificate:	
 	

 
	 	 	 	 	 	

6

 

	

Address to which certificate representing unexercised Warrants, if any, are to be mailed if other than to the address of the registered holder of this Warrant Certificate as shown on the books of the Warrant Agent:	
 	

 
	 	 	 	 	 	
 (Street Address)
	 	 	 	 	 	    
 (City and State) (Zip Code)
	

 	
 	

 	

 	
 	

Dated:
	

 	
 	

 	

 	
 	

 Signature
	

 	
 	

 	

 	
 	
Signature must conform in all respects to the name of the holder as specified on the face of this Warrant Certificate. If Shares, or a Warrant Certificate evidencing unexercised Warrants, are to be issued in a name
other than that of the registered holder hereof or are to be delivered to an address other than the address of such holder as shown on the books of the Warrant Agent, the above signature must be guaranteed by a an Eligible Guarantor Institution (as
that term is defined in Rule 17Ad-15 of the Securities Exchange Act of 1934, as amended).
	
SIGNATURE GUARANTEE	

 	
 	

 
	

Name of Firm	
 	

 	

 	
 	

 
	 	 	
	 	 
	Address	 	 	 	 	 
	 	 	
	 	 
	Area Code and Number	 	 	 	 	 
	 	 	
	 	 
	Authorized Signature	 	 	 	 	 
	 	 	
	 	 
	Name	 	 	 	 	 
	 	 	
	 	 
	Title	 	 	 	 	 
	 	 	
	 	 
	Dated:	 	 	, 200            	 	 
	 	 	
	 	 	 

7

 
ASSIGNMENT 

(FORM
OF ASSIGNMENT TO BE EXECUTED IF WARRANT HOLDER

DESIRES TO TRANSFER WARRANTS EVIDENCED HEREBY) 

        FOR
VALUE RECEIVED,                          HEREBY SELL(S), ASSIGN(S) AND TRANSFER(S) UNTO

	(Please print name and address including zip code of assignee)	 	(Please insert social security or other identifying number of assignee)

the
rights represented by the within Warrant Certificate and does hereby irrevocably constitute and appoint
                         Attorney to transfer said Warrant Certificate
on the books of the Warrant Agent with full power of substitution in the premises. 

	 	 	 	 	 	Dated:
	

 	
 	

 	

 	
 	

 Signature
	

 	
 	

 	

 	
 	
(Signature must conform in all respects to the name of the holder as specified on the face of this Warrant Certificate and must bear a signature guarantee by an Eligible Guarantor Institution (as that term is
defined in Rule 17Ad-15 of the Securities Exchange Act of 1934, as amended).
	SIGNATURE GUARANTEE	 	 	 
	Name of Firm	 	 	 	 	 
	 	 	
	 	 
	Address	 	 	 	 	 
	 	 	
	 	 
	Area Code and Number	 	 	 	 	 
	 	 	
	 	 
	Authorized Signature	 	 	 	 	 
	 	 	
	 	 
	Name	 	 	 	 	 
	 	 	
	 	 
	Title	 	 	 	 	 
	 	 	
	 	 
	Dated:	 	 	, 200            	 	 
	 	 	
	 	 	 

8

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Exhibit 4.3

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