Document:

EPSOM
INVESTMENT SERVICES N.V.

        
          

        

      

      

      CalciTech
Ltd.

      CP 261,
10 route de l’aeroport

      1215
Geneva 15

      Switzerland

      

      31st August
2008

      

      Dears
Sirs,

      

      Re:
Credit Facility Agreement

      

      Further to our discussions and in view
of your current balance on the credit facility exceeding USD 2.4 million. We
understand that you are currently awaiting the closing of a placing with
Newlands Stockbrokers in London for additional working capital.

      

      In order
to overcome your immediate short-term cashflow situation, we can confirm that we
are willing to increase your facility to USD 5 million, on a temporary basis,
until the successful conclusion of the aforementioned placing or until 31st
December 2008, whichever is the earliest.

      

      All other terms and conditions will
remain unchanged.

      

      We will
review the facility again with you in three months time.

      

      Yours
faithfully,

      

      “David
Craven”

      

      David
Craven

      Director

      for and
on behalf of Epsom Investment Services N.V.

       

      
        Registered Office : Main
Street, Charlestown, Nevis, West Indies

          
            

          

        

        Administrative office : P.O.
Box 254, 1215 Geneva 15, Switzerland 

        Tel.
(+41) 22 7990800 Fax (+41) 22 7990801CALCITECH
LTD

    

    ADDENDUM
TO 6% CONVERTIBLE DEBENTURE DUE 31st December 2009 No. 21 as
amended.

    

    This
first addendum to the above referenced debenture is effective as of the 31st
December, 2008

    

    The below
amendments have been effected by this addendum to the above agreement and it’s
earlier addendums to reflect the conversion at the 31st
December, 2008 of 50% of the outstanding principle into common shares of
CalciTech Ltd at a price of US$ 0.095, the addition to the remaining outstanding
principle  of all accrued and unpaid interest to 31st
December, 2008 and extension of the note to 31st
December, 2010 at a revised interest at the rate of 1.75% per annum, with a
revised conversion at a price of US$ 0.75 per common share during the extended
period.

    

    Whereas,
under section 1.1, the note shall be extended for a further term to 31st
December 2010 and the interest rate shall be reduced to 1.75% as calculated from
the 1st
January, 2009.

    

    Whereas,
under section 1.4, the rate of interest shall be 1.75% per annum. This replaces
from 1st
January, 2009, the previous rate of 6%.

    

    Whereas,
under Section 3, subsection 3. 2 of the above referenced Debenture, this shall
now be amended whereby, subject to adjustment pursuant to Section 3.3, the
Conversion price of a share of the Company’s Common Stock shall be three
quarters United States Dollars (US$0.75) on the conversion date.

    

                                     IN
WITNESS WHEREOF, the company has caused this first addendum to the 6%
Convertible Debenture due 2009 to be duly executed by an authorized officer as
of the date first above indicated.

    
       

    

    
      
        
          	 
      	
                  FOR
      CALCITECH LTD

                
	 
      	 
      
	 
      	
                  R A
      Leopard

                
	 
      	
                  President
      & CEO

                
	 
      	
                  Debenture
      No.21

                

        

      

    

    

    
      
        
          	 
      	 
      
	
                  Witnessed:

                	 
      
	 	 
	
                  Antoine
      Ratsaphong,

                	 
      
	
                  Chief
      AccountantEPSOM
ASSET MANAGEMENT LTD.

        
          

        

      

      

      CalciTech
Ltd.

      CP 261,
10 route de l’aeroport

      1215
Geneva 15

      Switzerland

      

      23rd
February 2009

      

      Dears
Sirs,

      

      Re:
Debt Restructuring

      

      I write
to confirm our discussions concerning the restructuring of the debt due from
CalciTech Ltd. in order to raise further working capital.

      

      Epsom
agrees to convert the outstanding balance on the credit facility as at 31st
December 2008, which stands at $5,436,095, into CalciTech Ltd. common shares
provided that existing and new investors acquire 50% of the shares converted..
The conversion will be at a price of $0.095 per share. The proceeds will be
loaned to CalciTech under the current credit facility for working capital
purposes.

      

      Yours
faithfully,

      for and
on behalf of Epsom Asset Management Ltd.

      

      “David
Craven”

      

      David
Craven

      Director

      

      Registered Office: Main
Street, Charlestown, Nevis, West Indies

      
        
          
Administrative office: P.O.
Box 254, 1215 Geneva 15, Switzerland

      

      Tel.
(+41) 22 7990800        Fax (+41) 22
7990801EPSOM
ASSET MANAGEMENT LTD.

        
          

        

         

        CalciTech
Ltd.

      

      CP 261,
10 route de l’aeroport

      1215
Geneva 15

      Switzerland

      

      25th
February 2009

       

      Dears
Sirs,

      

      Re:
Credit Facility Agreement

      

      I can confirm that upon completion of
the debt restructuring agreed on 23rd
February 2009, Epsom will increase the credit facility limit from $2.5 million
to $3 million.  The effective interest rate on the balance drawn down
will be reduced from 3.5% to 1.75%

      

      If you require and further information,
please do not hesitate to contact me.

      

      Yours
faithfully,

      for and
on behalf of Epsom Asset Management Ltd.

      

      “David
Craven”

      

      David
Craven

      Director

      

      Registered Office: Main
Street, Charlestown, Nevis, West Indies

        
          

        

      

      Administrative office: P.O.
Box 254, 1215 Geneva 15, Switzerland

      Tel.
(+41) 22 7990800        Fax (+41) 22
7990801EPSOM
ASSET MANAGEMENT LTD.

        
          

        

      

      

      CalciTech
Ltd.

      CP 261,
10 route de l’aeroport

      1215
Geneva 15

      Switzerland

      

      29th May
2009

       

      Dears
Sirs,

      

      Re:
Credit Facility Agreement

      

      Further to your request, I can confirm
that the balance due from CalciTech Ltd., under the above mentioned credit
facility agreement, as at 31st
December 2008 amounted to USD5,436,095.33. This balance includes all interest
charges up to 31st
December 2008.

      

      As
discussed, this balance exceeds the extension that was granted to CalciTech in
August 2008. We confirm that we are willing to extend your balance further to
meet your working capital needs until such time as the conversion of our
outstanding balance is converted into common shares. We understand that this is
likely to be in early June.

      

      If you require and further information,
please do not hesitate to contact me.

      

      Yours
faithfully,

      for and
on behalf of Epsom Asset Management Ltd.

      

      “David
Craven”

      

      David
Craven

      Director

      

      Registered Office: Main
Street, Charlestown, Nevis, West Indies

        
          

        

      

      Administrative office: P.O.
Box 254, 1215 Geneva 15, Switzerland

      Tel.
(+41) 22 7990800        Fax (+41) 22
7990801NOTE MODIFICATION
AGREEMENT

    

    THIS NOTE MODIFICATION
AGREEMENT (this “Agreement”) is entered into this 26th day of June, 2009
by and between US Dataworks,
Inc., a Nevada corporation (the “Company”) and Charles E. Ramey, an
individual residing in the State of Texas and the Chairman and Chief Executive
Officer of the Company (the “Holder”).  All capitalized terms not
specifically defined herein shall have those meanings set forth in that certain
US Dataworks, Inc. Refinancing Secured Note dated August 13, 2008 executed by
the Company and payable to the order of the Holder in the original principal
amount of Seven Hundred Eight Thousand Five Hundred Dollars ($708,500), as
amended by that certain Note Modification Agreement dated February 19, 2009 and
that certain Note Modification Agreement dated May 20, 2009 (as modified,
renewed and extended to date, the “Note”).

    

    W I T N E S S E T H:

    

    WHEREAS,
the Company and the Holder wish to revise certain provisions of the
Note;

    

    NOW,
THEREFORE, for and in consideration of the premises, the mutual covenants and
agreements contained herein, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the Company and the
Holder hereby agree as follows:

    

    1.           The
following modifications to the Note are made and agreed to effective as of June
26, 2009:

    

    
      	
               
      

            	
              A.

            	
              Section
      1 of the Note is hereby amended by adding the following sentence to the
      beginning of the Section:

            

    

    

    “Within
ten (10) days after the end of each calendar quarter beginning with June 30,
2009, the Company (A) shall make mandatory principal payments to the Holder in
an amount equal to (i) $21,255.00, or three percent (3%) of the original
principal amount of this Note, plus (ii) 19.1% of one-fourth of the Company’s
cash balance in excess of $611,105 as of the end of such calendar quarter and
(B) may, in the sole and absolute discretion of the Board of Directors of the
Company, make an additional principal payment of up to 19.1% of one-fourth of
the Company’s cash balance in excess of $611,105 as of the end of such calendar
quarter; provided, however, that if the mandatory principal payment referred to
in clause (i) of clause (A) above (together with the other like mandatory
quarterly principal payment due to the other holder of the Notes) would reduce
the Company’s cash balance as of the last day of such calendar quarter below
$500,000, then the amount of the mandatory principal payment referred to in such
clause shall be reduced to 19.1% of the amount, if any, by which the Company’s
cash balance as of the last day of such quarter exceeds $500,000 (with any such
shortfall in such scheduled principal payment not rolling into the
next scheduled principal payment).”

     

    
      
        
        

      

      
        1

        
          

        

      

      
        
        

      

    

    

    
      	
               
      

            	
              B.

            	
              The
      reference to “December 31, 2009” in Section 1 of the Note is hereby
      replaced with “July 1, 2010.”

            

    

    

    2.           In
consideration of the Holder’s agreements to the modifications set forth in
Section 1 of this Agreement, the Company shall pay an amendment fee to the
Holder in the amount of $9,550.00, such amount to be payable on July 1,
2009.  In addition, as additional consideration for the Holder’s
agreements to the modifications set forth in Section 1 of this Agreement, the
Company will, effective as of the date hereof, issue to the Holder warrants to
acquire 354,141 shares of the Company’s common stock at an exercise price of
$0.43 per share, with such warrants to be subject to the terms outlined in
Exhibit A attached hereto.

    

    3.           The
Note, as modified by this Agreement, and all of the other loan documents and
other agreements and instruments executed and delivered in connection with the
Note shall remain in full force and effect.

    

    4.           The
Company and the Holder represent and warrant to each other that, as of the date
hereof: (a) each such party has full power and authority to execute this
Agreement; (b) this Agreement constitutes the legal, valid and binding
obligation of such party, enforceable in accordance with its terms, except as
enforceability may be limited by applicable bankruptcy, insolvency,
reorganization, moratorium, or other similar laws affecting the enforcement of
creditors' rights generally; and (c) no authorization, approval, consent or
other action by, notice to, or filing with, any governmental authority or other
person is required for the execution, delivery or performance by such party of
this Agreement.

    

    5.           The
parties hereto shall from time to time execute and deliver all such other
documents, instruments and assurances with respect to the matters described
herein, and take all such other actions as may be necessary or required to carry
into force and effect the purposes and intent of this Agreement.

    

    6.           This
Agreement, when executed by the parties hereto, shall be binding upon and inure
to the benefit of the parties hereto, and their respective heirs, executors,
administrators, personal representatives, successors and assigns.

    

    7.           This
Agreement may be executed simultaneously in a number of identical counterparts,
each of which shall be an original and all of which together shall constitute
but one and the same instrument.

    

    [Signature
Page Follows]

     

    
      
        
        

      

      
        2

        
          

        

      

      
        
        

      

    

    

    
      IN
WITNESS WHEREOF, this Agreement has been executed and delivered by the parties
hereto on the date first set forth above.

      

      

      
        	
                THE
      COMPANY:

              
	 
      	 
      
	
                US
      DATAWORKS, INC.

              
	 
      	 
      
	
                By:

              	
                /s/ J. Patrick
      Millinor Jr.

              
	 
      	 
      
	
                Name:

              	
                J.
      Patrick Millinor, Jr.

              
	 
      	
                 
      

              
	
                Title:

              	
                Director

              

      

      

       

      
        	
                THE
      HOLDER:

              
	 
      
	
                /s/ Charles E.
      Ramey

              
	
                Charles
      E. Ramey

              

      

      

      

      

      WRITTEN CONSENT OF THE
REQUIRED HOLDERS:

      

      In
accordance with Section 8 of the Note, the undersigned Required Holders hereby
execute this written consent to the Agreement, thereby indicating their consent
to the changes and amendments to the Note contained in this
Agreement.

      

      

      
        	 
      /s/ Charles E. Ramey
	
                Charles
      E. Ramey

              
	 
      
	 
      
	
                  /s/ John L.
      Nicholson, M.D.

              
	
                John
      L. Nicholson, M.D.

              

      

       

      
        
           

        

        
          3

          
            

          

        

        
           

        

      

       

    

    
      
        	
                EXHIBIT
      A

              

      

      

      
        	
                TERMS
      OF WARRANTS

              

      

      

      
        	
                1.

              	
                Number
      of shares of common stock underlying the warrants will be
      354,141.

              

      

      

      
        	
                2.

              	
                Exercise
      price of the warrants will be $0.43 per
share.

              

      

      

      
        	
                3.

              	
                Term
      of the warrants will be five years from the date
  hereof.

              

      

      

      
        	
                4.

              	
                Warrants
      may be exercised in a “cashless exercise” at the Company’s
      option.

              

      

      

      
        	
                5.

              	
                No
      adjustments to the exercise price or the number of shares underlying the
      warrants except for the typical “corporate events” adjustments for stock
      splits, reverse splits, stock dividends, recapitalizations and the
      like.

              

      

      

      
        	
                6.

              	
                In
      the event of a fundamental transaction (such as a merger, sale of
      substantially all assets, tender offer or other business combination) in
      which the stockholders of the Company become entitled to receive
      securities, cash or other assets with respect to their common stock, the
      warrants will convert into the right to receive such securities, cash and
      other assets upon exercise of the
warrants.

              

      

      

      
        	
                7.

              	
                Warrant
      holders will not be deemed to be stockholders of the Company for any
      purpose unless and until the warrants are
  exercised.

              

      

      

      
        
          	
                  8.

                	
                  The
      warrants will not be transferable until the earlier of (i) Note being paid
      in full or (ii) an
      event of default occurring under the
  Note.

                

        

      

      

      
        	
                9.

              	
                The
      warrants and the shares of common stock underlying the warrants will be
      issued under a private offering exemption available under applicable
      federal and state securities laws.  The warrant holders will
      have no registration rights related thereto and the warrants and the
      shares of common stock underlying the warrants will be subject to resale
      and transfer restrictions as imposed by applicable state and federal
      securities laws.

              

      

      

      
        	
                10.

              	
                Governing
      law shall be Texas.

              

      

      

      
        	
                11.

              	
                Dispute
      resolution shall be by binding
arbitration.

              

      

      

      
        	
                12.

              	
                The
      warrants will be subject to the additional provisions of a written
      agreement governing the warrants to be negotiated in good faith between
      the Company and the Holder promptly following execution and delivery of
      this Agreement.

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