Document:

EXHIBIT 10.8
                                                                    ------------

             AMENDMENT TO SUTRON CORPORATION STOCK OPTION AGREEMENTS

Pursuant to the terms and conditions contained in the Sutron Corporation Stock
Option Agreements dated November 1, 1996 and October 18, 2002 (the "Agreement")
between Daniel W. Farrell and Sutron Corporation, and the Sutron Corporation
1996 Stock Option Plan and 2002 Stock Option Plan (the "Plans"), you were
granted options to purchase 40,200 shares and 90,000 shares of Sutron
Corporation Common Stock at an exercise price of $1.125 and $.55. Your options
originally vested over a five year period.

On December 22, 2005, the Board of Directors of Sutron Corporation approved
amendments to all outstanding stock option agreements whereby Sutron accelerated
the vesting of all unvested options issued under the Plan, including your
options. As a result of such acceleration, effective December 22, 2005, all of
your options to purchase Sutron Corporation Common Stock that were not then
vested became immediately vested and exercisable. Accordingly, effective
December 22, 2005 all of your options to purchase Sutron Corporation Common
Stock are immediately vested and exercisable. All other terms and conditions of
your Agreements remain unchanged.

This Amendment is effective as of December 22, 2005. As amended by this letter,
all of the provisions of the Agreement are hereby approved, confirmed and
ratified. Please acknowledge your agreement to the foregoing terms by signing in
the space provided below and returning the originally executed letter.

SUTRON CORPORATION
By:      /s/ Raul S. McQuivey
         --------------------------------
         Raul S. McQuivey

ACKNOWLEDGED AND AGREED TO THIS 22ND DAY OF DECEMBER 2005
By:      /s/ Daniel W. Farrell
         -------------------------
         Daniel W. FarrellEXHIBIT 10.9
                                                                    ------------

             AMENDMENT TO SUTRON CORPORATION STOCK OPTION AGREEMENTS

Pursuant to the terms and conditions contained in the Sutron Corporation Stock
Option Agreements dated November 1, 1996 and October 18, 2002 (the "Agreement")
between Sidney C. Hooper and Sutron Corporation, and the Sutron Corporation 1996
Stock Option Plan and 2002 Stock Option Plan (the "Plans"), you were granted
options to purchase 40,200 shares and 120,000 shares of Sutron Corporation
Common Stock at an exercise price of $1.125 and $.55. Your options originally
vested over a five year period.

On December 22, 2005, the Board of Directors of Sutron Corporation approved
amendments to all outstanding stock option agreements whereby Sutron accelerated
the vesting of all unvested options issued under the Plan, including your
options. As a result of such acceleration, effective December 22, 2005, all of
your options to purchase Sutron Corporation Common Stock that were not then
vested became immediately vested and exercisable. Accordingly, effective
December 22, 2005 all of your options to purchase Sutron Corporation Common
Stock are immediately vested and exercisable. All other terms and conditions of
your Agreements remain unchanged.

This Amendment is effective as of December 22, 2005. As amended by this letter,
all of the provisions of the Agreement are hereby approved, confirmed and
ratified. Please acknowledge your agreement to the foregoing terms by signing in
the space provided below and returning the originally executed letter.

SUTRON CORPORATION
By:      /s/ Raul S. McQuivey
         --------------------------------
         Raul S. McQuivey

ACKNOWLEDGED AND AGREED TO THIS 22ND DAY OF DECEMBER 2005
By:      /s/ Sidney Hooper
         --------------------------------
         Sidney HooperEXHIBIT 10.10
                                                                   -------------

             AMENDMENT TO SUTRON CORPORATION STOCK OPTION AGREEMENT

Pursuant to the terms and conditions contained in the Sutron Corporation Stock
Option Agreement dated October 18, 2002 (the "Agreement") between Thomas N.
Keefer and Sutron Corporation, and the Sutron Corporation 2002 Stock Option Plan
(the "Plan"), you were granted options to purchase 15,000 shares of Sutron
Corporation Common Stock at an exercise price of $.55. Your option originally
vested over a five year period.

On December 22, 2005, the Board of Directors of Sutron Corporation approved
amendments to all outstanding stock option agreements whereby Sutron accelerated
the vesting of all unvested options issued under the Plan, including your
options. As a result of such acceleration, effective December 22, 2005, all of
your options to purchase Sutron Corporation Common Stock that were not then
vested became immediately vested and exercisable. Accordingly, effective
December 22, 2005 all of your options to purchase Sutron Corporation Common
Stock are immediately vested and exercisable. All other terms and conditions of
your Agreements remain unchanged.

This Amendment is effective as of December 22, 2005. As amended by this letter,
all of the provisions of the Agreement are hereby approved, confirmed and
ratified. Please acknowledge your agreement to the foregoing terms by signing in
the space provided below and returning the originally executed letter.

SUTRON CORPORATION
By:      /s/ Raul S. McQuivey
         --------------------------------
         Raul S. McQuivey

ACKNOWLEDGED AND AGREED TO THIS 22ND DAY OF DECEMBER 2005
By:      /s/ Thomas N. Keefer
         --------------------------------
         Thomas N. KeeferEXHIBIT 10.1
                                                                    ------------

                       Network-1 Security Solutions, Inc.
                           445 Park Avenue, Suite 1028
                              New York, N.Y. 10022

                                 March 29, 2006

Corey M. Horowitz, Chairman & CEO
Network-1 Security Solutions, Inc.
445 Park Avenue, Suite 1028
New York, New York  10022

                 Re:  Extension of Anti-dilution Protection

Dear Corey:

     This letter shall confirm that Section 6(b) of your Employment Agreement,
dated November 26, 2004, with Network-1 Security Solutions, Inc. (the
"Employment Agreement") is hereby amended as follows (all capitalized terms
herein shall have the same meaning as set forth in the Employment Agreement):

     "At anytime during the period ended November 26, 2006, in the event that
the Company completes a financing (either a single transaction or series of
transactions) consisting of the issuance of common stock or any other securities
convertible or exercisable into common stock, (exclusive of securities issued
upon exercise of outstanding options, warrants or other convertible securities),
Executive shall receive (at the closing of such financing) from the Company, at
the same price as the securities issued in the financing, such number of
additional options to purchase Common Stock so that Executive maintains his
Derivative Ownership Percentage, provided, that, the provisions of this
paragraph shall provide anti-dilution protection to Executive up to a maximum
financing of $2.5 million. Such additional options to be issued to Executive
shall immediately vest on the date of grant and shall contain substantially the
same provisions as the Options issued pursuant to Section 6(a) hereof."

     Please sign below to confirm our understanding.

                                       Very truly yours,

                                       Newtork-1 Security Solutions, Inc.

Agreed and Accepted:                   By:  /s/ David Kahn
                                           -------------------------------------
                                           David Kahn, Chief Financial Officer
 /s/ Corey M. Horowitz
--------------------------------
Corey M. HorowitzWWW.EXFILE.COM, INC. -- 14203 -- DSL.NET, INC. -- EXHIBIT 10.33 TO FORM 10-K

    EXHIBIT
      10.33

     

    
 

    DunKnight
      Telecom Partners LLC

    

    
      
        

      

    

    January
      3, 2006

    

    DSL.net,
      Inc.

    545
      Long
      Wharf Drive

    5th
      Floor

    New
      Haven, CT 06511

    Attention:
      David F. Struwas, President & CEO

    

    Dear
      Mr.
      Struwas:

    

    Reference
      is made to that certain Securities Purchase Agreement (the “Agreement”),
      dated
      as of November 2, 2005, by and among DSL.net, Inc., a Delaware corporation
      (the
“Company”),
      and
      DunKnight Telecom Partners LLC. Capitalized terms used herein and not otherwise
      defined herein shall have the meanings ascribed to them in the
      Agreement.

    

    This
      will
      confirm the parties’ agreement to effectively amend and modify certain
      provisions of the Agreement and certain of the Transaction Documents entered
      into in connection with the Agreement, as set forth in this letter agreement
      (this “Amendment”).
      

    

    Upon
      execution and delivery of this Amendment, for valuable consideration, the
      receipt and sufficiency of which are hereby acknowledged, the parties hereto
      agree as follows, effective as of the date above written: 

    

    1.  
      Deferral
      of Additional Investment.
      Section
      4.13 of the Agreement is hereby amended and restated to read in its entirety
      as
      follows: 

    

    “4.13. Additional
      Investment Obligation.
      On
      February 1, 2006, provided that no material Event of Default (other than one
      arising from or under Section 7(b) of the Debentures) has occurred prior to
      such
      date which has not been previously waived or cured, each Purchaser, or its
      designees, shall be required to purchase, in the ratio of such Purchaser’s
      Subscription Amount on the Closing Date to the aggregate Subscription Amounts
      of
      all Purchasers on the Closing Date (such amount, the Purchaser’s “Pro
      Rata Share”),
      additional debentures totaling $5,000,000 in principal amount, for an aggregate
      purchase price of $4,000,000 (the “Additional
      Investment”).
      For
      the sake of clarity, the Purchaser shall be required to subscribe for the entire
      Additional Investment to the extent that it has not designated other purchasers
      or such designees fail to make their pro rata share of such investment on
      February 1, 2006. The form of Debenture used for the foregoing additional
      debentures shall be identical to the form of Debenture used at the initial
      Closing, provided, however, the maturity date in the Debentures shall be
      September 4, 2006.”

    

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    2.  
      Extension
      of Maturity Date.
      The
      maturity date of the Debentures shall be and hereby is extended to September
      4,
      2006. 

    

    3.  
      Conforming
      Changes.
      The
      parties hereto agree that the other operative provisions of the Transaction
      Documents shall be and hereby are amended mutatis
      mutandis,
      to give
      effect to the modifications made pursuant to numbered sections 1 and 2 of this
      Amendment, above. Notwithstanding the foregoing, the parties agree to take
      such
      further actions and execute and deliver such additional instruments as shall
      be
      reasonably requested or legally required to more fully give effect to the
      transactions contemplated by this Amendment. Other than as set forth in this
      Amendment, the terms and provisions of the Agreement and the other Transaction
      Documents remain in full force and effect. 

    

    4.  
      Waiver.
      DunKnight Telecom Partners LLC, as Purchaser under the Agreement and as Investor
      and Agent under the Security Agreement, hereby irrevocably waives any and all
      Company defaults under the Transaction Documents, if any, arising from or
      attributable to the delayed implementation by any of the Company’s banks of
      account control agreements for the benefit of the Purchaser and the Agent,
      and
      further agrees that the Company’s obligations under Section 12(d) of the
      Security Agreement with respect to the establishment of account control
      agreements shall be, and are hereby, extended until February 1, 2006.

     

    5.  
      Certain
      Representations and Warranties.
      DunKnight Telecom Partners LLC and, by his signature below, Keir Kleinknecht,
      as
      sole managing member of such entity, each hereby represents and warrants to
      the
      Company that (a) DunKnight Telecom Partners LLC has full right, power and
      authority to enter into this Amendment and to carry out its obligations
      hereunder, (b) this Amendment constitutes the valid and legally binding
      obligation of DunKnight Telecom Partners LLC, enforceable against it in
      accordance with its terms, and (c) DunKnight Telecom Partners LLC has or will
      have by the required funding date adequate liquid funds necessary for such
      Purchaser to make the Additional Investment in accordance with this Amendment.
      By his signature below, Keir Kleinknecht, the sole managing member of DunKnight
      Telecom Partners LLC, agrees to cause DunKnight Telecom Partners LLC to fully
      and timely perform its obligations under this Amendment. 

    

    By
      countersigning this Amendment, the Company hereby acknowledges and agrees to
      all
      of the terms and conditions hereof.

    

    The
      Purchaser:

    

    DunKnight
      Telecom Partners LLC

     

    By:
      /s/
      Keir Kleinknecht

    Name:
      Keir Kleinknecht

    Title:
      Sole Managing Member 

    Date:
      January 3, 2006

    

    
      
        
        

      

      
        2

        
          

        

      

      
        
        

      

    

    The
      Agent:

    

    DunKnight
      Telecom Partners LLC,

    as
      Agent

    

    

    By:
      /s/
      Keir Kleinknecht

    Name:
      Keir Kleinknecht

    Title:
      Sole Managing Member 

    Date:
      January 3, 2006

    

    

    Acknowledged
      and Agreed to by:

    

    The
      Company:

    

    DSL.net,
      Inc.

    

    

    By:
      /s/
      David F. Struwas

    Name:
      David F. Struwas

    Title:
      President and Chief Executive Officer 

    Date:
      January 3, 2006

    

    
 

     

     

     

     

     

     

     

     

     

     

    
      
        
        

      

      3

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