Document:

Confidential treatment has been requested for portions of this exhibit. The copy
filed  herewith  omits  the  information  subject  to a confidentiality request.
Omissions  are  designated  ******. A complete version of this exhibit has been
filed  separately  with  the  Securities  and  Exchange  Commission.

                                Statement of Work
                                  6 August 2004

1.1.     Define  spacecraft  bus  subsystems  for  a three axis stabilized small
satellite.
[******]  The  fundamental  spacecraft  bus  elements  and the work required to
establish  them  are  as  follows:

1.1.1.     [******].

1.1.2.     [******].

1.1.3.     [******].

1.1.4.     [******].

1.1.5.     [******].

1.2.     [******].

1.3.     [******].

                                      PAGE

Confidential treatment has been requested for portions of this exhibit. The copy
filed  herewith  omits  the  information  subject  to a confidentiality request.
Omissions  are  designated  ******. A complete version of this exhibit has been
filed  separately  with  the  Securities  and  Exchange  Commission.

1.4.     [******].

1.5.     [******].

1.6.     [******].

2.     Payload  Interface The objective is to establish a payload ICD (Interface
       ------------------
Control  Document)  which  will  be  provided  to  potential  payload customers.
[******].

2.1.     [******].

                                      PAGE

Confidential treatment has been requested for portions of this exhibit. The copy
filed  herewith  omits  the  information  subject  to a confidentiality request.
Omissions  are  designated  ******. A complete version of this exhibit has been
filed  separately  with  the  Securities  and  Exchange  Commission.

2.2.     [******].

2.3.     [******].

2.4.     [******].

2.5.     [******].

3.     TCP/IP  Distributed  Operations.  [******]:
       -------------------------------

3.1.     [******].

3.2.     [******].

3.3.     [******].

                                      PAGE

Confidential treatment has been requested for portions of this exhibit. The copy
filed  herewith  omits  the  information  subject  to a confidentiality request.
Omissions  are  designated  ******. A complete version of this exhibit has been
filed  separately  with  the  Securities  and  Exchange  Commission.

3.4.     [******].

4.     Rapid  Action  Plan  for  Integration  &  Test.  [******]:
       ----------------------------------------------

4.1.     [******]

4.2.     [******]ation

4.3.     [******]

4.4.     [******]

4.5.     [******]

5.     Autonomous  On-orbit  Commissioning
       -----------------------------------

5.1.     [******].

5.2.     [******].

5.3.     [******].

                                      PAGE

Confidential  treatment  has  been  requested for portions of this exhibit. The
copy  filed herewith omits the information subject to a confidentiality request.
Omissions  are  designated  ******. A complete version of this exhibit has been
filed  separately  with  the  Securities  and  Exchange  Commission.

6.     Support  the  Small  Satellite  Development  Group.  [******].
       --------------------------------------------------

                                      PAGEExhibit 4.10 

AMENDMENT NO. 3 TO
RIGHTS AGREEMENT 

        This
Amendment No. 3, dated as of August 15, 2004 (this “Amendment”), to the
Rights Agreement, dated as of July 17, 1997, as amended by Amendment No. 1 to Rights
Agreement dated as of May 4, 2001 and Amendment to Rights Agreement effective as of
June 30, 2000 (as so amended, the “Rights Agreement”), is by and between
Valero Energy Corporation, a Delaware corporation (formerly Valero Refining and Marketing
Company) (the “Company”) and Computershare Investor Services, LLC (as successor
to Harris Trust and Savings Bank), as Rights Agent (the “Rights Agent”). 

        WHEREAS,
the Company has determined that it is advantageous to adopt a book-entry form of
registration for its common stock, par value $.01 per share (“Common Stock”),
that permits uncertificated shares of Common Stock, through the Direct Registration System
and has done so; 

        WHEREAS,
the Company considers it advisable to amend the Rights Agreement explicitly to provide for
uncertificated shares of Common Stock; and 

        WHEREAS,
pursuant to Section 27 of the Rights Agreement, the Company desires to amend the Rights
Agreement to provide for uncertificated shares of Common Stock with associated Rights; 

        NOW,
THEREFORE, in consideration of the premises and mutual agreements set forth herein and in
the Rights Agreement, the Company and the Rights Agent hereby agree as follows: 

	  	
Section
1.      Definitions. Capitalized terms used and not
otherwise defined herein shall have the meaning assigned to such terms in the Rights
Agreement.  

	  	
Section
2.     Amendments to Rights Agreement. 

	(a) 	                   Section 3(a)(x) of the
Rights Agreement is hereby amended to read in its           entirety as follows:  

	  	
           
           
        “(x)  the
Rights will be evidenced (subject to the provisions of Section 3(b) hereof)
               by the certificates for Common Shares registered in the names of the
holders                thereof (which certificates shall also be deemed to be Right
Certificates), or                by a current ownership statement issued with respect to
uncertificated Common                Shares in lieu of such a certificate (an “Ownership
Statement”), and                not by separate Rights Certificates, and” 

	(b) 	           Section 3(b) of the Rights Agreement is hereby amended to read in its entirety
          as follows:  

	  	
           
           
                   “(b)    On
the Record Date, or as soon as practicable thereafter, the Company will send
               a copy of a Summary of Rights to Purchase Preferred Shares, in
substantially the                form of Exhibit C hereto (the “Summary of
Rights”), by                first-class, postage-prepaid mail, to each record holder
of Common Shares as of                the close of business on the Record Date, at the
address of such holder shown on                the records of the Company. With respect
to certificates, or Ownership                Statements, for Common Shares outstanding as
of the Record Date, until the                Distribution Date, the Rights will be
evidenced by such certificates, or such                Ownership Statements, registered
in the names of the holders thereof together                with a copy of the Summary of
Rights attached thereto. Until the Distribution                Date (or the earlier of
the Redemption Date or the Final Expiration Date), the                surrender for
transfer of any such certificate for Common Shares, or the                transfer of any
Common Shares covered by such an Ownership Statement,                outstanding on the
Record Date, with or without a copy of the Summary of Rights                attached
thereto, shall also constitute the transfer of the Rights associated                with
the Common Shares represented or covered thereby.” 

-1- 

	(c)	
                 Section
3(c) of the Rights Agreement is hereby amended to read in its entirety           as
follows:  

	  	           
           
        
“Certificates
(or Ownership Statements) for Common Shares which become outstanding (including, without
limitation, reacquired Common Shares referred to in the last sentence of this paragraph
(c)) after the Record Date but prior to the earliest of the Distribution Date, the
Redemption Date or the Final Expiration Date shall have impressed on, printed on, written
on or otherwise affixed to them a legend substantially as follows:  

	  	
This
[certificate] [statement] also evidences and entitles the holder hereof to certain rights
as set forth in a Rights Agreement between Valero Energy Corporation (formerly Valero
Refining and Marketing Company) and [Harris Trust and Savings Bank] [Computershare
Investor Services, LLC (as successor to Harris Trust and Savings Bank)] (the “Rights
Agreement”), the terms of which are hereby incorporated herein by reference and a
copy of which is on file at the principal executive offices of Valero Energy Corporation.
Under certain circumstances, as set forth in the Rights Agreement, such Rights will be
evidenced by separate certificates and will no longer be evidenced by this [certificate]
[statement]. Valero Energy Corporation will mail to the holder of this [certificate]
[statement] a copy of the Rights Agreement without charge after receipt of a written
request therefor. Under certain circumstances, as set forth in the Rights Agreement,
Rights issued to any Person who becomes an Acquiring Person (as defined in the Rights
Agreement) may become null and void. 

	  	
With
respect to such certificates, or Ownership Statements, containing the foregoing legend,
until the Distribution Date, the Rights associated with the Common Shares represented by
such certificates, or covered by such Ownership Statements, shall be evidenced by such
certificates, or such Ownership Statements, alone, and the surrender for transfer of any
such certificate, or the transfer of any Common Shares covered by such an Ownership
Statement, shall also constitute the transfer of the Rights associated with the Common
Shares represented or covered thereby. In the event that the Company purchases or acquires
any Common Shares after the Record Date but prior to the Distribution Date, any Rights
associated with such Common Shares shall be deemed cancelled and retired so that the
Company shall not be entitled to exercise any Rights associated with the Common Shares
which are no longer outstanding.” 

	  	        (d)                 Section
16(c) of the Rights Agreement is hereby amended to read in its entirety           as
follows:  

	  	                            “the
Company and the Rights Agent may deem and treat the person in whose name the Right
Certificate (or, prior to the Distribution Date, the associated Common Shares) is
registered as the absolute owner thereof and of the Rights evidenced thereby
(notwithstanding any notations of ownership or writing on the Right Certificates or the
associated Common Shares certificate or Ownership Statement made by anyone other than the
Company or the Rights Agent) for all purposes whatsoever, and neither the Company nor the
Rights Agent shall be affected by any notice to the contrary.” 

	  	        (e)                 Exhibit
C to the Rights Agreement is hereby replaced by Exhibit C attached to           this
Amendment.  

                  
Section 3.
          
Effect on Rights Agreement. Except as expressly modified by
this Amendment, the Rights Agreement is in all respects ratified and confirmed and all
the terms, conditions and provisions thereof shall remain in full force and effect.  

-2- 

                  
Section 4.
          
 Governing Law. This Amendment shall be deemed to be a contract made under the
laws of the State of Delaware and for all purposes shall be governed by and construed in
accordance with the law of such State applicable to contracts to be made and performed
entirely within such State. 

                  
Section 5.
           
Counterparts. This Amendment may be executed in any number of counterparts and
each of such counterparts shall for all purposes be deemed to be an original, and all such
counterparts shall together constitute but one and the same instrument. 

                  
Section 6.
           
Severability. If any term, provision, covenant or restriction of this Amendment
is held by a court of competent jurisdiction or other authority to be invalid, void or
unenforceable, the remainder of the terms, provisions, covenants and restrictions of this
Amendment, and of the Rights Agreement, shall remain in full force and effect and shall in
no way be affected, impaired or invalidated. 

                  
Section 7.
           
Descriptive Headings. Descriptive headings used in this Amendment are inserted
for convenience only and shall not control or affect the meaning or construction of any of
the provisions of this Amendment. 

        IN
WITNESS WHEREOF, the parties hereto have caused this Amendment No. 3 to be duly executed
as of the day and year first above written. 

		VALERO ENERGY CORPORATION

		By:	/s/ Jay Browning
	 

			Jay D. Browning
 Vice President & Secretary

	 

		COMPUTERSHARE INVESTOR SERVICES, LLC

		By:	/s/ Keith Bradley 
	 
	 	Name:	Keith Bradley	
		Title:	Vice President	

-3- 

Exhibit C 

SUMMARY OF RIGHTS TO PURCHASE 
PREFERRED SHARES 

        On
July 17, 1997, the Board of Directors of Valero Energy Corporation (formerly known as
“Valero Refining and Marketing Company,” hereafter the “Company”)
declared a dividend of one preferred share purchase right (a “Right”) for each
outstanding share of common stock, par value $0.01 per share (the “Common
Shares”), of the Company. Each Right entitles the registered holder to purchase from
the Company one one-hundredth of a share of Junior Participating Preferred Stock, Series
I, par value $0.01 per share (the “Preferred Shares”), of the Company at a price
of $100.00 per one one-hundredth of a Preferred Share (the “Purchase Price”),
subject to adjustment. The description and terms of the Rights are set forth in a Rights
Agreement, as amended (the “Rights Agreement”), between the Company and
Computershare Investor Services, LLC (as successor to Harris Trust and Savings Bank), as
Rights Agent (the “Rights Agent”). 

        Until
the earlier to occur of (i) 10 days following a public announcement that a person or group
of affiliated or associated persons (an “Acquiring Person”) have acquired
beneficial ownership of 15% or more of the outstanding Common Shares or (ii) 10 business
days (or such later date as may be determined by action of the Board of Directors prior to
such time as any person or group of affiliated persons becomes an Acquiring Person)
following the commencement of, or announcement of an intention to make, a tender offer or
exchange offer the consummation of which would result in the beneficial ownership by a
person or group of 15% or more of the outstanding Common Shares (the earlier of such dates
being called the “Distribution Date”), the Rights will be evidenced by
certificates for Common Shares, or by a current ownership statement issued with respect to
uncertificated Common Shares in lieu of such a certificate (an “Ownership
Statement”), with a copy of this Summary of Rights attached thereto. 

        The
Rights Agreement provides that, until the Distribution Date (or earlier redemption or
expiration of the Rights), the Rights will be transferred with and only with the Common
Shares. Until the Distribution Date (or earlier redemption or expiration of the Rights),
new certificates or Ownership Statements for Common Shares issued after the Record Date
upon transfer or new issuance of Common Shares will contain a notation incorporating the
Rights Agreement by reference. Until the Distribution Date (or earlier redemption or
expiration of the Rights), the surrender for transfer of any certificates for Common
Shares, or the transfer of any Common Shares covered by an Ownership Statement,
outstanding as of the Record Date, even without such notation or a copy of this Summary of
Rights being attached thereto, will also constitute the transfer of the Rights associated
with the Common Shares represented by such certificate or covered by such Ownership
Statement. As soon as practicable following the Distribution Date, separate certificates
evidencing the Rights (“Right Certificates”) will be mailed to holders of record
of the Common Shares as of the close of business on the Distribution Date and such
separate Right Certificates alone will evidence the Rights. 

        The
Rights are not exercisable until the Distribution Date. The Rights will expire on June 30,
2007 (the “Final Expiration Date”), unless the Final Expiration Date is extended
or unless the Rights are earlier redeemed or exchanged by the Company, in each case, as
described below. 

        The
Purchase Price payable, and the number of Preferred Shares or other securities or property
issuable, upon exercise of the Rights are subject to adjustment from time to time to
prevent dilution (i) in the event of a stock dividend on, or a subdivision, combination or
reclassification of, the Preferred Shares, (ii) upon the grant to holders of the Preferred
Shares of certain rights or warrants to subscribe for or purchase Preferred Shares at a
price, or securities convertible into Preferred Shares with a conversion price, less than
the then-current market price of the Preferred Shares or (iii) upon the distribution to
holders of the Preferred Shares of evidences of indebtedness or assets (excluding regular
periodic cash dividends paid out of earnings or retained earnings or dividends payable in
Preferred Shares) or of subscription rights or warrants (other than those referred to
above). 

        The
number of outstanding Rights and the number of one one-hundredths of a Preferred Share
issuable upon exercise of each Right are also subject to adjustment in the event of a
stock split of the Common Shares or a stock dividend on the Common Shares payable in
Common Shares or subdivisions, consolidations or combinations of the Common Shares
occurring, in any such case, prior to the Distribution Date. 

        Preferred
Shares purchasable upon exercise of the Rights will not be redeemable. Each Preferred
Share will be entitled to a minimum preferential quarterly dividend payment of $1 per
share but will be entitled to an aggregate dividend of 100 times the dividend declared per
Common Share. In the event of liquidation, the holders of the Preferred Shares will be
entitled to a minimum preferential liquidation payment of $100 per share but will be
entitled to an aggregate payment of 100 times the payment made per Common Share. Each
Preferred Share will have 100 votes, voting together with the Common Shares. Finally, in
the event of any merger, consolidation or other transaction in which Common Shares are
exchanged, each Preferred Share will be entitled to receive 100 times the amount received
per Common Share. These rights are protected by customary antidilution provisions. 

Exhibit C, Page 1 of 2 

        Because
of the nature of the Preferred Shares’ dividend, liquidation and voting rights, the
value of the one one-hundredth interest in a Preferred Share purchasable upon exercise of
each Right should approximate the value of one Common Share. 

        In
the event that the Company is acquired in a merger or other business combination
transaction or 50% or more of its consolidated assets or earning power are sold after a
person or group has become an Acquiring Person, proper provision will be made so that each
holder of a Right will thereafter have the right to receive, upon the exercise thereof at
the then current exercise price of the Right, that number of shares of common stock of the
acquiring company which at the time of such transaction will have a market value of two
times the exercise price of the Right. In the event that any person or group of affiliated
or associated persons becomes an Acquiring Person, proper provision shall be made so that
each holder of a Right, other than Rights beneficially owned by the Acquiring Person
(which will thereafter be void), will thereafter have the right to receive upon exercise
that number of Common Shares having a market value of two times the exercise price of the
Right. 

        At
any time after any person or group becomes an Acquiring Person and prior to the
acquisition by such person or group of 50% or more of the outstanding Common Shares, the
Board of Directors of the Company may exchange the Rights (other than Rights owned by such
person or group which will have become void), in whole or in part, at an exchange ratio of
one Common Share, or one one-hundredth of a Preferred Share (or of a share of a class or
series of the Company’s preferred stock having equivalent rights, preferences and
privileges), per Right (subject to adjustment). 

        With
certain exceptions, no adjustment in the Purchase Price will be required until cumulative
adjustments require an adjustment of at least 1% in such Purchase Price. No fractional
Preferred Shares will be issued (other than fractions which are integral multiples of one
one-hundredth of a Preferred Share, which may, at the election of the Company, be
evidenced by depositary receipts) and in lieu thereof, an adjustment in cash will be made
based on the market price of the Preferred Shares on the last trading day prior to the
date of exercise. 

        At
any time prior to the acquisition by a person or group of affiliated or associated persons
of beneficial ownership of 15% or more of the outstanding Common Shares, the Board of
Directors of the Company may redeem the Rights in whole, but not in part, at a price of
$0.01 per Right (the “Redemption Price”). The redemption of the Rights may be
made effective at such time on such basis with such conditions as the Board of Directors
in its sole discretion may establish. Immediately upon any redemption of the Rights, the
right to exercise the Rights will terminate and the only right of the holders of Rights
will be to receive the Redemption Price. 

        The
terms of the Rights may be amended by the Board of Directors of the Company without the
consent of the holders of the Rights, including an amendment to lower certain thresholds
described above to not less than the greater of (i) the sum of .001% and the largest
percentage of the outstanding Common Shares then known to the Company to be beneficially
owned by any person or group of affiliated or associated persons and (ii) 10%, except that
from and after such time as any person or group of affiliated or associated persons
becomes an Acquiring Person no such amendment may adversely affect the interests of the
holders of the Rights. 

        Until
a Right is exercised, the holder thereof, as such, will have no rights as a stockholder of
the Company, including, without limitation, the right to vote or to receive dividends. 

        A
copy of the Rights Agreement has been filed with the Securities and Exchange Commission as
Exhibit 4.1 to a Registration Statement on Form S-8 filed July 21, 1997 (Registration No.
333-31709). Copies of the Rights Agreement and amendments thereto are available free of
charge from the Company. This summary description of the Rights does not purport to be
complete and is qualified in its entirety by reference to the Rights Agreement, as
amended, which is hereby incorporated herein by reference. 

Exhibit C, Page 2 of 2

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