Exhibit 4.6


THE SECURITIES  REPRESENTED  HEREBY (THE  "SECURITIES") HAVE NOT BEEN REGISTERED
UNDER THE  SECURITIES  ACT OF 1933, AS AMENDED (THE  "SECURITIES  ACT"),  OR THE
SECURITIES  LAWS OF ANY  STATE  AND MAY NOT BE SOLD OR  OFFERED  FOR SALE IN THE
ABSENCE OF AN EFFECTIVE  REGISTRATION STATEMENT FOR THE SECURITIES OR AN OPINION
OF  COUNSEL  OR  OTHER  EVIDENCE   ACCEPTABLE  TO  THE  CORPORATION   THAT  SUCH
REGISTRATION IS NOT REQUIRED.

                          COMMON STOCK PURCHASE WARRANT

                              XYBERNAUT CORPORATION

                              Expires June 19, 2005

No.:  W-D04-4                                       Number of Shares:  1,887,403
Date of Issuance:  December 20, 2004


         1. Issuance. For good and valuable consideration,  the receipt of which
is hereby  acknowledged by Xybernaut  Corporation,  a Delaware  corporation (the
"Company"),  Polar  Properties  Ltd.,  a  company  organized  under  the laws of
Anguilla or its registered assigns (the "Holder") is hereby granted the right to
purchase at any time until 5:00 P.M.,  New York City time, on June 19, 2005 (the
"Expiration Date"), One Million Eight Hundred Eighty-Seven Thousand Four Hundred
Three (1,887,403) shares of the Company's common stock, par value $.01 per share
(the "Common  Stock") at an exercise  price (the  "Exercise  Price") at any time
from the date hereof  through and  including  the  Expiration  Date the exercise
price  shall be $1.16  cents per  share  (the  "Initial  Exercise  Price").  The
Exercise Price shall be subject to further  adjustment as set forth in Section 6
hereof.

         2.  Exercise of Warrants.  This Warrant is  exercisable  in whole or in
part at the Exercise Price per share of Common Stock payable hereunder,  payable
in cash or by certified or official bank check.  Upon  surrender of this Warrant
Certificate  with the annexed  Notice of Exercise Form duly  executed,  together
with payment of the Exercise Price for the shares of Common Stock purchased, the
Holder shall be entitled to receive a certificate or certificates for the shares
of Common Stock so purchased.

         3.  Reservation of Shares.  The Company hereby agrees that at all times
during the term of this  Warrant  there  shall be  reserved  for  issuance  upon
exercise of this  Warrant  such number of shares of its Common Stock as shall be
required for issuance upon exercise of this Warrant (the "Warrant Shares").

         4.  Mutilation  or Loss of  Warrant.  Upon  receipt  by the  Company of
evidence  satisfactory  to it of the loss,  theft,  destruction or mutilation of
this  Warrant,  and (in the  case of  loss,  theft or  destruction)  receipt  of
reasonably  satisfactory  indemnification,  and (in the case of




mutilation)  upon surrender and  cancellation of this Warrant,  the Company will
execute  and  deliver a new  Warrant  of like  tenor and date and any such lost,
stolen, destroyed or mutilated Warrant shall thereupon become void.

         5. Rights of the Holder.  The Holder  shall not, by virtue  hereof,  be
entitled to any rights of a stockholder in the Company, either at law or equity,
and the rights of the Holder are limited to those  expressed in this Warrant and
are not enforceable against the Company except to the extent set forth herein.

         6. Protection Against Dilution.
            ----------------------------

            (a) Adjustment Mechanism.  If an adjustment of the Exercise Price is
required  pursuant to this  Section 6, the Holder  shall be entitled to purchase
such  number of  additional  shares of Common  Stock as will cause (i) the total
number of shares of Common Stock Holder is entitled to purchase pursuant to this
Warrant,  multiplied  by (ii) the adjusted  purchase  price per share,  to equal
(iii) the dollar  amount of the total number of shares of Common Stock Holder is
entitled to purchase  before  adjustment  multiplied by the total purchase price
before adjustment.

            (b) Capital Adjustments. In case of any stock split or reverse stock
split, stock dividend,  reclassification of the Common Stock,  recapitalization,
merger or consolidation,  or like capital adjustment  affecting the Common Stock
of the  Company,  the  provisions  of this Section 6 shall be applied as if such
capital  adjustment  event had  occurred  immediately  prior to the date of this
Warrant and the original  purchase price had been fairly  allocated to the stock
resulting from such capital adjustment;  and in other respects the provisions of
this Section 6 shall be applied in a fair, equitable and reasonable manner so as
to give effect,  as nearly as may be, to the purposes  hereof. A rights offering
to stockholders of the Company shall be deemed a stock dividend to the extent of
the bargain purchase element of the rights.

            (c)  Adjustment  for Spin  Off.  If,  for any  reason,  prior to the
exercise of this Warrant in full,  the Company  spins off or  otherwise  divests
itself of a part of its business or  operations or disposes all or a part of its
assets in a  transaction  (the "Spin Off") in which the Company does not receive
compensation for such business,  operations or assets,  but causes securities of
another entity (the "Spin Off  Securities") to be issued to security  holders of
the Company, then

            (i) the Company shall cause (a) to be reserved  Spin Off  Securities
     equal to the number  thereof  which would have been issued to the Holder in
     the event  all of the  Holder's  unexercised  Warrants  outstanding  on the
     record  date (the  "Record  Date") for  determining  the number of Spin Off
     Securities   to  be  issued  to  security   holders  of  the  Company  (the
     "Outstanding  Warrants")  been exercised as of the close of business on the
     trading day  immediately  prior to the Record Date (the  "Reserved Spin Off
     Shares"),  and (b) to be issued to the Holder on the exercise of all or any
     of the  Outstanding  Warrants,  such amount of the Reserved Spin Off Shares
     equal to (x) the Reserved Spin Off Shares multiplied by (y) a fraction,  of
     which (I) the  numerator  is the amount of the  Outstanding  Warrants  then
     being exercised,  and (II) the denominator is the amount of the Outstanding
     Warrants; and


                                      -2-


            (ii)  the  Exercise  Price  on the  Outstanding  Warrants  shall  be
     adjusted  immediately after consummation of the Spin Off by multiplying the
     Exercise  Price by a fraction  (if, but only if, such fraction is less than
     1.0), the numerator of which is the average Closing Bid Price of the Common
     Stock for the five (5) trading days immediately following the fifth trading
     day after the Record  Date,  and the  denominator  of which is the  average
     Closing  Bid  Price  of the  Common  Stock on the  five  (5)  trading  days
     immediately  preceding the Record Date;  and such adjusted  Exercise  Price
     shall be deemed to be the Exercise  Price with  respect to the  Outstanding
     Warrants after the Record Date.

         7.  Warrant  Call.  At  any  time  or  from  time  to  time  after  the
Registration  Statement  (as defined in Section 9(b)  hereof) has been  declared
effective,  the Company,  at its option,  may, upon written notice to the Holder
(the "Call  Notice"),  call up to one hundred  percent (100%) of this Warrant if
the Common  Stock trades at a price equal to or greater than $3.00 per share for
five (5)  consecutive  trading  days  prior to the date the  Company  calls  the
Warrant.  To be  effective,  the Call Notice must be given  within ten (10) days
after the aforementioned  five (5) day period. The rights and privileges granted
pursuant to this Warrant with respect to such Warrant Shares subject to the Call
Notice shall  terminate if this  Warrant is not  exercised  with respect to such
Warrant  Shares by the  Holder  within  ten (10) days  after the Call  Notice is
received by the Holder.  In the event that this Warrant is not  exercised by the
Holder  with  respect to the Warrant  Shares  subject to the Call  Notice,  this
Warrant  shall  expire at 5:00 p.m.  New York City time on the call date and the
Company  will  remit to the Holder  $0.01 per  Warrant  Share and a new  Warrant
certificate  representing the number of Warrant Shares,  if any, with respect to
which this Warrant has not been  exercised or subject to a Call Notice upon such
Holder tendering to the Company the expired Warrant certificate.

         8. Limitation on Exercise. Notwithstanding anything to the contrary set
forth in this Warrant or the Common Stock and Warrant Purchase Agreement of even
date herewith (the  "Purchase  Agreement"),  the Holder shall not be entitled to
exercise  this Warrant and the Company  shall have no obligation to issue shares
of Common Stock upon such  exercise of all or any portion of this Warrant to the
extent that,  following  such  exercise,  the  Beneficial  Ownership  Number (as
defined  below) is equal to or greater than 4.99% of the  outstanding  shares of
Common  Stock  (including  the  shares  to be  issued  to the  Holder  upon such
exercise).  Notwithstanding the foregoing,  this Section 8 shall have no further
force and effect if there is an  outstanding  tender offer for any or all of the
shares of the Company's Common Stock, or the Holder, at its option,  provides at
least  sixty-five  (65) days' advance  written  notice from the Holder that this
Section 8 shall have no further force and effect.  For purposes of this Section,
"Beneficial Ownership Number" shall equal the sum of (i) the number of shares of
Common Stock owned by the Holder and its affiliates (other than shares of Common
Stock  which may be deemed  beneficially  owned  through  the  ownership  of the
unexercised  portion of this Warrant or other rights to purchase Common Stock or
through the ownership of convertible securities),  and (ii) the number of shares
of Common Stock issuable upon the exercise of this Warrant. For purposes of this
Section, "beneficial ownership" shall be defined in accordance with Rule 13(d)-3
of  the  Securities  Exchange  Act of  1934,  as  amended.  The  Holder,  by its
acceptance  of this  Warrant,  further  agrees that if the Holder  transfers  or
assigns any of the Warrants to any party,  such assignment shall be made subject
to  the  transferee's  or  assignee's  specific  agreement  to be


                                      -3-


bound by the provisions of this Section 8 as if such transferee or assignee were
the original Holder hereof.

         9. Transfer to Comply with the Securities Act; Registration Rights.
            ----------------------------------------------------------------

            (a) This Warrant has not been registered under the Securities Act of
1933, as amended (the "Act"),  or any applicable  state securities laws, and has
been issued to the Holder for investment and not with a view to the distribution
of either the Warrant or the Warrant Shares. Neither this Warrant nor any of the
Warrant  Shares or any other  security  issued or issuable upon exercise of this
Warrant may be sold,  transferred,  pledged or hypothecated in the absence of an
effective  registration  statement under the Act relating to such security or an
opinion of counsel satisfactory to the Company that registration is not required
under the Act.  Each  certificate  for the Warrant,  the Warrant  Shares and any
other security  issued or issuable upon exercise of this Warrant shall contain a
legend on the face thereof,  in form and substance  satisfactory  to counsel for
the  Company,  setting  forth the  restrictions  on transfer  contained  in this
Section.

            (b) The Company agrees to file a registration statement, which shall
include  the  Warrant  Shares,  on  Form  S-3 or  another  available  form  (the
"Registration Statement"), pursuant to the Registration Rights Agreement between
the Company and the Holder  dated as of even date  herewith  (the  "Registration
Rights Agreement").

         10. Notices.  Any notice or other  communication  required or permitted
hereunder  shall be in writing and shall be delivered  personally,  telegraphed,
telexed,  sent by facsimile  transmission  or sent by  certified,  registered or
express mail,  postage  pre-paid.  Any such notice shall be deemed given when so
delivered personally,  telegraphed,  telexed or sent by facsimile  transmission,
or, if mailed,  two (2) days  after the date of  deposit  in the  United  States
mails, as follows:

            (i) if to the Company, to:

                Xybernaut Corporation
                12701 Fair Lakes Circle
                Suite  550
                Fairfax, Virginia  22033
                Attn:  Chief Financial Officer
                Telephone No.: (703) 631-6925
                Facsimile No.: (703) 631-3903


                                      -4-


                with a copy to:

                Jenkens & Gilchrist Parker Chapin LLP
                The Chrysler Building
                405 Lexington Avenue
                New York, New York  10174
                Attn: Martin Eric Weisberg, Esq.
                Telephone No.: (212) 704-6000
                Facsimile No.: (212) 704-6288

           (ii) if to the Holder, to:

                Polar Properties Ltd.
                Mevot David 8
                Ramat Gan, Israel
                Attn: Mary Lowenthal
                Telephone No.: _____________
                Facsimile No.: ______________

                with a copy to:

                Krieger & Prager LLP
                39 Broadway, Suite 1440
                New York, New York  10006
                Attn:  Samuel Krieger, Esq.
                Telephone No.:  (212) 363-2900
                Facsimile No.: (212) 363-2999

Any party may be  notice  given in  accordance  with this  Section  to the other
parties designate another address or person for receipt of notices hereunder.

         11.  Supplements and Amendments;  Whole Agreement.  This Warrant may be
amended or  supplemented  only by an instrument in writing signed by the parties
hereto. This Warrant and the Purchase Agreement,  of even date herewith,  by and
between the Company and the Holder contain the full understanding of the parties
hereto with  respect to the subject  matter  hereof and thereof and there are no
representations,  warranties,  agreements or understandings other than expressly
contained herein and therein.

         12.  Governing Law; Waiver of Jury. This Agreement shall be governed by
and  construed  in  accordance  with the laws of the State of New York,  without
regard to principles of conflicts of law thereof.  This  Agreement  shall not be
interpreted  or construed  with any  presumption  against the party causing this
Agreement to be drafted.  In any action,  suit or proceeding in any jurisdiction
arising out of or related  directly or  indirectly  to this  Agreement,  whether
brought by the Company against the Holder or the Holder against the Company, the
Company and the Holder each hereby absolutely, unconditionally,  irrevocably and
expressly waives forever trial by jury.



                                      -5-


         13.  Counterparts.  This  Warrant  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.

         14. Descriptive Headings.  Descriptive headings of the several Sections
of this  Warrant  are  inserted  for  convenience  only and shall not control or
affect the meaning or construction of any of the provisions hereof.

         IN WITNESS WHEREOF, the parties hereto have executed this Warrant as of
this ___ day of December, 2004.

                                            XYBERNAUT CORPORATION


                                            By:
                                               ---------------------------------
                                               Name:
                                               Title:












                                      -6-


                          NOTICE OF EXERCISE OF WARRANT

         The  undersigned  hereby  irrevocably  elects to  exercise  the  right,
represented  by the Warrant  Certificate  No.  W-D04-4  dated as of December __,
2004,  to  purchase  1,887,403  shares of the Common  Stock,  par value $.01 per
share, of Xybernaut  Corporation and tenders herewith payment in accordance with
Section 1 of said Common Stock Purchase Warrant.

         Please deliver the stock certificate to:

                          ----------------------------
                          ----------------------------
                          ----------------------------
                          ----------------------------
                          ----------------------------


Dated: _____ day of __________, 200__

                                            Polar Properties Ltd.


                                            By:
                                               ---------------------------------
                                               Name:
                                               Title:






                                      -7-