EXHIBIT 4.3

                          REGISTRATION RIGHTS AGREEMENT
                          -----------------------------


          This  Registration  Rights  Agreement  dated as of June 30, 2002 (this
"Agreement"),  by and among Xybernaut  Corporation,  a Delaware corporation (the
"Company")   and  the   purchaser   executing  a  signature   page  hereto  (the
"Purchaser").

          Upon the terms and subject to the  conditions  of the Common Stock and
Warrant Purchase Agreement,  dated as of June 30, 2002, by and among the Company
and the Purchaser (the "Purchase Agreement"),  the Company has agreed to provide
to the Purchaser certain  registration  rights under the Securities Act of 1933,
as  amended,  and the rules and  regulations  thereunder,  with  respect  to the
3,333,333  shares (the "Shares") of the Company's  common stock,  par value $.01
per share ("Common Stock"), and the 833,333 shares of Common Stock issuable upon
exercise of the Warrants (the "Warrant  Shares")  issued to the Purchaser on the
date hereof pursuant to the Purchase Agreement.

          The number of Shares and Warrants to be issued to the Purchaser is set
forth opposite such Purchaser's name on Exhibit A to the Purchase Agreement.

          The Company and the Purchaser hereby agree as follows:

     1.   Definitions.

          Capitalized terms used and not otherwise defined herein shall have the
meanings given such terms in the Purchase Agreement.  As used in this Agreement,
the following terms shall have the following meanings:

          "Advice" shall have the meaning set forth in Section 3(k).

          "Affiliate"  means, with respect to any Person,  any other Person that
directly or indirectly controls or is controlled by or under common control with
such Person.  For the  purposes of this  definition,  "control,"  when used with
respect to any Person, means the possession, direct or indirect, of the power to
direct or cause the  direction  of the  management  and policies of such Person,
whether  through the ownership of voting  securities,  by contract or otherwise;
and the terms of  "affiliated,"  "controlling"  and  "controlled"  have meanings
correlative to the foregoing.

          "Blackout Period" shall have the meaning set forth in Section 3(l).

          "Board" shall have the meaning set forth in Section 3(l).

          "Business Day" means any day except Saturday, Sunday and any day which
shall be a legal holiday or a day on which banking  institutions in the State of
New York generally are authorized or required by law or other government actions
to close.

          "Commission" means the Securities and Exchange Commission.

          "Common  Stock" means the Company's  Common Stock,  par value $.01 per
share.






          "Effectiveness Date" means with respect to the Registration  Statement
the  earlier of the 120th day  following  the  Closing  Date under the  Purchase
Agreement,  before  which the  Company  will use its best  efforts  to cause the
registration  statement to become  effective,  and the date which is within five
(5) Business Days of the date on which the  Commission  informs the Company that
the Commission (i) will not review the  Registration  Statement or (ii) that the
Company may request the  acceleration of the  effectiveness  of the Registration
Statement.

          "Effectiveness Period" shall have the meaning set forth in Section 2.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended.

          "Filing Date" means the date the Registration Statement is filed which
date shall be on or before the 30th date after the Closing Date.

          "Holder" or "Holders" means the holder or holders, as the case may be,
from time to time of Registrable  Securities,  including the Purchaser and their
permitted assigns.

          "Indemnified Party" shall have the meaning set forth in Section 6(c).

          "Indemnifying Party" shall have the meaning set forth in Section 6(c).

          "Losses" shall have the meaning set forth in Section 6(a).

          "Nasdaq" shall mean the Nasdaq National Market.

          "Person"  means an individual or a  corporation,  partnership,  trust,
incorporated or  unincorporated  association,  joint venture,  limited liability
company, joint stock company,  government (or an agency or political subdivision
thereof) or other entity of any kind.

          "Proceeding" means an action, claim, suit, investigation or proceeding
(including,  without limitation, an investigation or partial proceeding, such as
a deposition), whether commenced or threatened.

          "Prospectus"  means  the  prospectus   included  in  the  Registration
Statement  (including,  without  limitation,  a  prospectus  that  includes  any
information  previously  omitted from a prospectus filed as part of an effective
registration  statement  in  reliance  upon  Rule  430A  promulgated  under  the
Securities Act), as amended or supplemented by any prospectus  supplement,  with
respect  to  the  terms  of  the  offering  of any  portion  of the  Registrable
Securities covered by the Registration  Statement,  and all other amendments and
supplements to the  Prospectus,  including  post-effective  amendments,  and all
material incorporated by reference in such Prospectus.

          "Registrable  Securities"  means the Shares and/or the Warrant  Shares
and any shares of Common Stock  issuable upon any stock split,  stock  dividend,
recapitalization or similar event with respect to such Shares or Warrant Shares.

          "Registration Statement" means the registration statement contemplated
by  Section  2,  including  (in  each  case)  the  Prospectus,   amendments  and
supplements to such



                                      -2-


registration   statement  or  Prospectus,   including  pre-  and  post-effective
amendments,  all exhibits thereto, and all material incorporated by reference in
such registration statement.

          "Rule 144" means Rule 144  promulgated by the  Commission  pursuant to
the  Securities  Act,  as such Rule may be  amended  from  time to time,  or any
similar  rule  or  regulation   hereafter   adopted  by  the  Commission  having
substantially the same effect as such Rule.

          "Rule 158" means Rule 158  promulgated by the  Commission  pursuant to
the  Securities  Act,  as such Rule may be  amended  from  time to time,  or any
similar  rule  or  regulation   hereafter   adopted  by  the  Commission  having
substantially the same effect as such Rule.

          "Rule 415" means Rule 415  promulgated by the  Commission  pursuant to
the  Securities  Act,  as such Rule may be  amended  from  time to time,  or any
similar  rule  or  regulation   hereafter   adopted  by  the  Commission  having
substantially the same effect as such Rule.

          "Securities Act" means the Securities Act of 1933, as amended.

     2.   Registration. The Company shall use its best efforts to prepare and
file  with the  Commission,  on or  prior to the  Filing  Date,  a  Registration
Statement  covering all  Registrable  Securities for an offering to be made on a
continuous  basis pursuant to Rule 415. The  Registration  Statement shall be on
Form S-3 (except if the Company is not then  eligible to register for resale the
Registrable  Securities on Form S-3, in which case such registration shall be on
another appropriate form in accordance herewith). The Company shall use its best
efforts to cause the Registration  Statement to be declared  effective under the
Securities  Act as promptly as  practicable  after the filing  thereof but on or
prior  to  the  Effectiveness  Date  and to  keep  such  Registration  Statement
continuously  effective  under  the  Securities  Act  until  such date as is the
earlier  of (x)  the  date  when  all  Registrable  Securities  covered  by such
Registration  Statement have been sold or (y) the date on which the  Registrable
Securities  may be sold  pursuant to Rule 144(k) as determined by the counsel to
the Company  pursuant to a written  opinion  letter,  addressed to the Company's
transfer agent to such effect (the "Effectiveness Period").

     3.   Registration Procedures.

          In connection with the Company's  registration  obligations hereunder,
the Company shall:

          (a) Use its best efforts to prepare and file with the  Commission,  on
or prior to the Filing  Date,  a  Registration  Statement on Form S-3 (or if the
Company is not then eligible to register for resale the  Registrable  Securities
on Form S-3 such registration shall be on another appropriate form in accordance
herewith) in accordance  with the method or methods of  distribution  thereof as
specified by the Holders  (except if  otherwise  directed by the  Holders),  and
cause the Registration  Statement to become effective and remain effective on or
prior to the  Effectiveness  Date as provided herein;  provided,  however,  that
prior to the filing of the Registration  Statement or any related  Prospectus or
any  amendment or  supplement  thereto  (including  any  document  that would be
incorporated  therein by  reference),  the Company  shall furnish to the Holders
copies of all such documents  proposed to be filed,  which documents (other than
those incorporated by reference) will be subject to the review of such Holders.



                                      -3-


          (b)  (i)  Prepare  and  file  with  the  Commission  such  amendments,
including  post-effective  amendments,  to the Registration  Statement as may be
necessary to keep the Registration  Statement  continuously  effective as to the
applicable  Registrable  Securities for the Effectiveness Period; (ii) cause the
related  Prospectus  to be amended or  supplemented  by any required  Prospectus
supplement,  and as so  supplemented or amended to be filed pursuant to Rule 424
(or any similar  provisions then in force) promulgated under the Securities Act;
(iii)  respond as promptly as  practicable  to any  comments  received  from the
Commission with respect to the Registration  Statement or any amendment  thereto
and as promptly as practicable  provide the Holders true and complete  copies of
all  correspondence  from and to the  Commission  relating  to the  Registration
Statement;  and (iv) comply in all material  respects with the provisions of the
Securities  Act and the  Exchange  Act with  respect to the  disposition  of all
Registrable   Securities  covered  by  the  Registration  Statement  during  the
applicable  period in accordance with the intended methods of disposition by the
Holders thereof set forth in the Registration Statement as so amended or in such
Prospectus as so supplemented.

          (c)  Notify  the  Holders  of  Registrable  Securities  to be  sold as
promptly as practicable (i)(A) when a Prospectus or any Prospectus supplement or
post-effective  amendment to the Registration Statement is proposed to be filed;
(B) when the Commission notifies the Company whether there will be a "review" of
such Registration  Statement and whenever the Commission  comments in writing on
such Registration  Statement and (C) with respect to the Registration  Statement
or any post-effective amendment, when the same has become effective; (ii) of any
request by the Commission or any other Federal or state  governmental  authority
for amendments or supplements to the Registration Statement or Prospectus or for
additional  information;  (iii) of the  issuance by the  Commission  of any stop
order suspending the effectiveness of the Registration Statement covering any or
all of the Registrable  Securities or the initiation of any Proceedings for that
purpose;  (iv) of the receipt by the Company of any notification with respect to
the suspension of the  qualification  or exemption from  qualification of any of
the Registrable  Securities for sale in any  jurisdiction,  or the initiation or
threatening of any Proceeding for such purpose; and (v) of the occurrence of any
event that makes any statement made in the Registration  Statement or Prospectus
or any document  incorporated or deemed to be incorporated  therein by reference
untrue  in  any  material   respect  or  that  requires  any  revisions  to  the
Registration  Statement,  Prospectus or other  documents so that, in the case of
the  Registration  Statement or the Prospectus,  as the case may be, it will not
contain any untrue  statement  of a material  fact or omit to state any material
fact required to be stated therein or necessary to make the statements  therein,
in the light of the circumstances under which they were made, not misleading.

          (d) Use its best  efforts  to avoid the  issuance  of,  or, if issued,
obtain the withdrawal  of, (i) any order  suspending  the  effectiveness  of the
Registration Statement or (ii) any suspension of the qualification (or exemption
from  qualification)  of any of  the  Registrable  Securities  for  sale  in any
jurisdiction, at the earliest practicable moment.

          (e) Promptly deliver to each Holder, without charge, as many copies of
the Registration  Statement,  Prospectus or Prospectuses (including each form of
prospectus)  and each  amendment  or  supplement  thereto  as such  Persons  may
reasonably request.



                                      -4-


          (f) Prior to any public  offering of Registrable  Securities,  use its
best  efforts to register or qualify or  cooperate  with the selling  Holders in
connection  with the  registration  or  qualification  (or  exemption  from such
registration or qualification) of such Registrable Securities for offer and sale
under the  securities or Blue Sky laws of such  jurisdictions  within the United
States as any Holder  requests in  writing,  to keep each such  registration  or
qualification (or exemption therefrom) effective during the Effectiveness Period
and to do any and all other acts or things  necessary to enable the  disposition
in such  jurisdictions of the Registrable  Securities  covered by a Registration
Statement;  provided, however, that the Company shall not be required to qualify
generally to do business in any  jurisdiction  where it is not then so qualified
or to take any action that would subject it to general service of process in any
such jurisdiction  where it is not then so subject or subject the Company to any
material tax in any such jurisdiction where it is not then so subject.

          (g) Cooperate  with the Holders to facilitate  the timely  preparation
and delivery of  certificates  representing  Registrable  Securities  to be sold
pursuant to a Registration  Statement,  which  certificates shall be free of all
restrictive legends.

          (h) Upon the occurrence of any event  contemplated by Section 3(c)(v),
as promptly as  practicable,  prepare a  supplement  or  amendment,  including a
post-effective  amendment,  to the Registration Statement or a supplement to the
related  Prospectus or any document  incorporated  or deemed to be  incorporated
therein  by  reference,  and file  any  other  required  document  so  that,  as
thereafter  delivered,  neither the  Registration  Statement nor such Prospectus
will contain an untrue  statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements  therein,
in the light of the circumstances under which they were made, not misleading.

          (i) Use its best efforts to cause all Registrable  Securities relating
to such  Registration  Statement  to be  listed  on the  Nasdaq  and  any  other
securities  exchange,  quotation  system,  market or  over-the-counter  bulletin
board,  if any,  on which  similar  securities  issued by the  Company  are then
listed.

          (j) Comply in all  material  respects  with all  applicable  rules and
regulations  of the  Commission  and make  generally  available  to its security
holders  earning  statements  satisfying  the provisions of Section 11(a) of the
Securities Act and Rule 158 not later than forty-five (45) days after the end of
any 12-month period (or ninety (90) days after the end of any 12-month period if
such period is a fiscal  year)  commencing  on the first day of the first fiscal
quarter of the Company after the effective date of the  Registration  Statement,
which statement shall conform to the requirements of Rule 158.

          (k) Require each selling Holder to furnish to the Company  information
regarding such Holder and the distribution of such Registrable  Securities as is
required by law to be disclosed in the Registration  Statement,  and the Company
may exclude from such registration the Registrable Securities of any such Holder
who fails to furnish  such  information  within a  reasonable  time prior to the
filing of each Registration  Statement,  supplemented  Prospectus and/or amended
Registration  Statement.  If any Registration  Statement or Prospectus refers to
any Holder by name or otherwise as the Holder of any  securities of the Company,
then such  Holder  shall  promptly  notify the  Company of any fact of which the
Holder  becomes aware and the



                                      -5-


happening  of any event  which  relates  to the Holder or  distribution  of such
securities owned by such Holder which results in the  Registration  Statement or
the  Prospectus  included in such  Registration  Statement  containing an untrue
statement of material  fact or omitting to state a material  fact required to be
stated  therein or necessary to make the  statements  therein not misleading and
shall  provide to the Company such  information  as shall be necessary to enable
the  Company  to  prepare  a  supplement  or  post-effective  Amendment  to such
Registration  Statement or  Prospectus or any document  incorporated  therein by
reference or file any other document required so that the Registration Statement
or Prospectus  will not contain an untrue  statement of material fact or omit to
state a material fact required to be stated therein.

          If  the  Registration  Statement  refers  to any  Holder  by  name  or
otherwise as the holder of any securities of the Company, then such Holder shall
have the right to require (if such reference to such Holder by name or otherwise
is not required by the  Securities  Act or any similar  federal  statute then in
force)  the  deletion  of the  reference  to such  Holder  in any  amendment  or
supplement to the  Registration  Statement  filed or prepared  subsequent to the
time that such reference ceases to be required.

          Each  Holder  covenants  and  agrees  that  (i) it will  not  sell any
Registrable  Securities under the  Registration  Statement until it has received
copies of the  Prospectus as then amended or  supplemented  as  contemplated  in
Section 3(e) and notice from the Company that such  Registration  Statement  and
any  post-effective  amendments thereto have become effective as contemplated by
Section 3(c) and (ii) it and its officers, directors or Affiliates, if any, will
comply  with the  prospectus  delivery  requirements  of the  Securities  Act as
applicable to them in connection with sales of Registrable  Securities  pursuant
to the Registration Statement.

          Each Holder agrees by its acquisition of such  Registrable  Securities
that,  upon receipt of a notice from the Company of the  occurrence of any event
of the kind described in Section 3(c)(ii),  3(c)(iii), 3(c)(iv) or 3(c)(v), such
Holder will forthwith  discontinue  disposition of such  Registrable  Securities
under the  Registration  Statement until such Holder's  receipt of the copies of
the supplemented  Prospectus and/or amended Registration  Statement contemplated
by Section 3(h), or until it is advised in writing (the "Advice") by the Company
that the use of the applicable  Prospectus may be resumed,  and, in either case,
has  received  copies  of  any  additional  or  supplemental  filings  that  are
incorporated  or deemed to be  incorporated  by reference in such  Prospectus or
Registration Statement.

          (l) If (i) there is  material  non-public  information  regarding  the
Company  which  the  Company's  Board  of  Directors  (the  "Board")  reasonably
determines  not to be in the  Company's  best interest to disclose and which the
Company is not  otherwise  required to disclose,  or (ii) there is a significant
business  opportunity  (including,  but  not  limited  to,  the  acquisition  or
disposition  of assets  (other than in the  ordinary  course of business) or any
merger,  consolidation,  tender offer or other similar transaction) available to
the Company  which the Board  reasonably  determines  not to be in the Company's
best  interest to disclose  and which the Company  would be required to disclose
under the Registration Statement,  then the Company may suspend effectiveness of
a registration  statement and suspend the sale of Registrable Securities under a
Registration  Statement for a period not to exceed ninety (90)  consecutive days
or one hundred  and eighty  (180) days in the  aggregate  during any twelve (12)
month period (a "Blackout Period").



                                      -6-


          (m)  Notwithstanding  anything  to  the  contrary  contained  in  this
Agreement,  the  Registration  Statement  shall  register  for  resale  only the
Registrable  Securities,   other  securities  previously  issued  to  a  certain
institutional  investor,  and those  securities  listed on  Schedule  3.2 to the
Purchase Agreement.

     4.   Registration Expenses

          All fees and expenses  incident to the registration of the Registrable
Securities  shall be borne by the  Company,  other than fees and expenses of any
counsel retained by the Holders in connection with the transactions contemplated
by this Agreement and those set forth in the Purchase Agreement,  which fees and
expenses  shall  be  borne  exclusively  by the  Holders,  whether  or  not  the
Registration  Statement  is filed or becomes  effective  and  whether or not any
Registrable Securities are sold pursuant to the Registration Statement. The fees
and expenses to be borne by the Company shall include,  without limitation,  the
following: (i) all registration and filing fees (including,  without limitation,
fees and  expenses  (A) with  respect  to filings  required  to be made with the
Nasdaq  and each  other  securities  exchange  or  market  on which  Registrable
Securities are required  hereunder to be listed, and (B) with respect to filings
required to be made with the  Commission;  (ii)  printing  expenses  (including,
without limitation, expenses of printing certificates for Registrable Securities
and of printing prospectuses if the printing of prospectuses is requested by the
holders of a majority of the Registrable Securities included in the Registration
Statement),  (iii)  messenger,  telephone and delivery  expenses,  (iv) fees and
disbursements  of counsel for the Company and (v) fees and expenses of all other
Persons  retained  by the Company in  connection  with the  consummation  of the
transactions contemplated by this Agreement,  including, without limitation, the
Company's independent public accountants  (including the expenses of any comfort
letters or costs associated with the delivery by independent  public accountants
of a comfort  letter or comfort  letters).  In  addition,  the Company  shall be
responsible  for all of its internal  expenses  incurred in connection  with the
consummation  of the  transactions  contemplated  by this Agreement  (including,
without  limitation,  all salaries  and  expenses of its officers and  employees
performing  legal or accounting  duties),  the expense of any annual audit,  the
fees and expenses  incurred in  connection  with the listing of the  Registrable
Securities on any securities exchange as required hereunder.

    5.    Intentionally Omitted.

    6.    Indemnification.

          (a) Indemnification by the Company. The Company shall, notwithstanding
any termination of this Agreement,  indemnify and hold harmless each Holder, the
officers, directors, agents or employees, if any, of such Holder and each Person
who controls any such Holder (within the meaning of Section 15 of the Securities
Act or Section 20 of the Exchange Act) and the officers,  directors,  agents and
employees  of each  such  controlling  Person,  and the  respective  successors,
assigns,  estate and personal  representatives of each of the foregoing,  to the
fullest extent permitted by applicable law, from and against any and all claims,
losses, damages, liabilities,  penalties,  judgments, costs (including,  without
limitation, costs of investigation) and expenses (including, without limitation,
attorneys' fees and expenses) (collectively, "Losses"), as incurred, arising out
of or  relating to any untrue or alleged  untrue  statement  of a material  fact
contained  in  the  Registration  Statement,  any  Prospectus  or  any  form  of
prospectus  or in any



                                      -7-


amendment or supplement thereto or in any preliminary prospectus, or arising out
of or relating to any omission or alleged  omission of a material  fact required
to be stated therein or necessary to make the statements therein (in the case of
any Prospectus or form of prospectus or supplement  thereto, in the light of the
circumstances under which they were made) not misleading,  except to the extent,
but only to the extent,  that such untrue statements or omissions are based upon
information  regarding  such Holder  furnished in writing to the Company by such
Holder expressly for use therein,  which information was reasonably relied on by
the Company for use therein.  The Company  shall notify the Holders  promptly of
the  institution,  threat or assertion of any Proceeding of which the Company is
aware in connection with the transactions  contemplated by this Agreement.  Such
indemnity  shall  survive the  transfer  of the  Registrable  Securities  by the
Holders.

          (b) Indemnification by Holders.  Each Holder shall,  severally and not
jointly,  indemnify  and hold  harmless the Company,  the  directors,  officers,
agents and employees,  each Person who controls the Company  (within the meaning
of Section 15 of the Securities Act and Section 20 of the Exchange Act), and the
directors,  officers,  agents or employees of such controlling  Persons, and the
respective successors,  assigns, estate and personal  representatives of each of
the  foregoing,  to the fullest  extent  permitted by  applicable  law, from and
against all Losses, as incurred,  arising solely out of or based solely upon any
untrue statement of a material fact contained in the Registration Statement, any
Prospectus,  or any form of prospectus, or arising solely out of or based solely
upon any omission of a material fact required to be stated  therein or necessary
to make  the  statements  therein  (in the  case  of any  Prospectus  or form of
prospectus or supplement  thereto, in the light of the circumstances under which
they were made) not misleading, to the extent, but only to the extent, that such
untrue  statement or omission is contained in or omitted from any information so
furnished in writing by such Holder to the Company specifically for inclusion in
the  Registration  Statement or such  Prospectus and that such  information  was
reasonably  relied upon by the Company  for use in the  Registration  Statement,
such  Prospectus  or such form of  prospectus.  Notwithstanding  anything to the
contrary  contained  herein,  the Holder shall be liable under this Section 6(b)
for only that  amount as does not exceed the net  proceeds  to such  Holder as a
result  of the sale of  Registrable  Securities  pursuant  to such  Registration
Statement.

          (c) Conduct of Indemnification Proceedings. If any Proceeding shall be
brought or asserted  against  any Person  entitled to  indemnity  hereunder  (an
"Indemnified  Party"),  such Indemnified  Party promptly shall notify the Person
from whom  indemnity  is sought (the  "Indemnifying  Party) in writing,  and the
Indemnifying Party shall assume the defense thereof, including the employment of
counsel reasonably  satisfactory to the Indemnified Party and the payment of all
fees and expenses incurred in connection with defense thereof; provided that the
failure of any  Indemnified  Party to give such  notice  shall not  relieve  the
Indemnifying Party of its obligations or liabilities pursuant to this Agreement,
except (and only) to the extent that it shall be finally  determined  by a court
of  competent  jurisdiction  (which  determination  is not  subject to appeal or
further  review)  that  such  failure  shall  have  proximately  and  materially
adversely prejudiced the Indemnifying Party.

          An Indemnified  Party shall have the right to employ separate  counsel
in any such Proceeding and to participate in the defense  thereof,  but the fees
and expenses of such counsel shall be at the expense of such  Indemnified  Party
or Parties unless:  (1) the Indemnifying Party



                                      -8-


has  agreed in writing to pay such fees and  expenses;  or (2) the  Indemnifying
Party shall have failed promptly to assume the defense of such Proceeding and to
employ counsel  reasonably  satisfactory to such  Indemnified  Party in any such
Proceeding;  or (3) the named  parties  to any such  Proceeding  (including  any
impleaded  parties)  include both such  Indemnified  Party and the  Indemnifying
Party,  and such  Indemnified  Party shall have been  advised by counsel  that a
conflict of interest is likely to exist if the same  counsel  were to  represent
such  Indemnified  Party and the  Indemnifying  Party (in  which  case,  if such
Indemnified  Party notifies the Indemnifying  Party in writing that it elects to
employ  separate  counsel  at  the  expense  of  the  Indemnifying   Party,  the
Indemnifying  Party shall not have the right to assume the  defense  thereof and
such  counsel  shall  be  at  the  expense  of  the  Indemnifying   Party).  The
Indemnifying Party shall not be liable for any settlement of any such Proceeding
effected  without its written  consent,  which consent shall not be unreasonably
withheld.  No Indemnifying Party shall, without the prior written consent of the
Indemnified Party, effect any settlement of any pending Proceeding in respect of
which any  Indemnified  Party is a party,  unless  such  settlement  includes an
unconditional  release of such  Indemnified  Party from all  liability on claims
that are the subject matter of such Proceeding.

          All fees and expenses of the Indemnified  Party (including  reasonable
fees and expenses to the extent  incurred in connection  with  investigating  or
preparing  to defend  such  Proceeding  in a manner not  inconsistent  with this
Section) shall be paid to the Indemnified  Party,  as incurred,  within ten (10)
Business Days of written notice thereof to the Indemnifying Party, regardless of
whether it is ultimately determined that an Indemnified Party is not entitled to
indemnification hereunder; provided that the Indemnifying Party may require such
Indemnified  Party to undertake  to reimburse  all such fees and expenses to the
extent it is finally  judicially  determined that such Indemnified  Party is not
entitled to indemnification hereunder.

          (d) Contribution. If a claim for indemnification under Section 6(a) or
6(b) is unavailable to an Indemnified Party because of a failure or refusal of a
governmental  authority to enforce such  indemnification  in accordance with its
terms (by reason of public policy or otherwise),  then each Indemnifying  Party,
in lieu  of  indemnifying  such  Indemnified  Party,  shall,  severally  and not
jointly, contribute to the amount paid or payable by such Indemnified Party as a
result of such  Losses,  in such  proportion  as is  appropriate  to reflect the
relative fault of the  Indemnifying  Party and  Indemnified  Party in connection
with the actions,  statements or omissions that resulted in such Losses, as well
as any other  relevant  equitable  considerations.  The  relative  fault of such
Indemnifying  Party and  Indemnified  Party shall be determined by reference to,
among other  things,  whether any action in  question,  including  any untrue or
alleged untrue statement of a material fact or omission or alleged omission of a
material fact, has been taken or made by, or relates to information supplied by,
such Indemnifying, Party or Indemnified Party, and the parties' relative intent,
knowledge,  access to  information  and  opportunity  to correct or prevent such
action, statement or omission. The amount paid or payable by a party as a result
of any Losses shall be deemed to include,  subject to the  limitations set forth
in Section 6(c), any reasonable  attorneys' or other reasonable fees or expenses
incurred  by such party in  connection  with any  Proceeding  to the extent such
party   would  have  been   indemnified   for  such  fees  or  expenses  if  the
indemnification  provided  for in this  Section was  available  to such party in
accordance with its terms.  Notwithstanding  anything to the contrary  contained
herein,  the Holder shall be liable or required to contribute under this Section
6(d) for only that amount as



                                      -9-


does not  exceed  the net  proceeds  to such  Holder  as a result of the sale of
Registrable Securities pursuant to such Registration Statement.

          The parties  hereto  agree that it would not be just and  equitable if
contribution  pursuant  to  this  Section  6(d)  were  determined  by  pro  rata
allocation or by any other method of allocation  that does not take into account
the equitable considerations referred to in the immediately preceding paragraph.
No Person guilty of fraudulent  misrepresentation (within the meaning of Section
11(f) of the Securities Act) shall be entitled to  contribution  from any Person
who was not guilty of such fraudulent misrepresentation.

          The indemnity and  contribution  agreements  contained in this Section
are in addition to any liability that the  Indemnifying  Parties may have to the
Indemnified Parties 7. Rule 144.

     7.   Rule 144.

          As  long  as any  Holder  owns  Registrable  Securities,  the  Company
covenants  to use its best  efforts  to timely  file (or  obtain  extensions  in
respect  thereof  and file  within the  applicable  grace  period)  all  reports
required  to be filed by the Company  after the date hereof  pursuant to Section
13(a) or 15(d) of the  Exchange  Act.  As long as any  Holder  owns  Registrable
Securities,  if the Company is not required to file reports  pursuant to Section
13(a) or 15(d) of the  Exchange  Act, it will prepare and furnish to the Holders
and make publicly available in accordance with Rule 144(c) promulgated under the
Securities  Act annual  and  quarterly  financial  statements,  together  with a
discussion  and  analysis of such  financial  statements  in form and  substance
substantially  similar to those that would  otherwise be required to be included
in reports  required by Section  13(a) or 15(d) of the Exchange  Act, as well as
any other  information  required  thereby,  in the time period that such filings
would have been  required to have been made under the Exchange  Act. The Company
further  covenants  that it will take such  further  action  as any  Holder  may
reasonably request, including the issuance of a legal opinion of counsel, all to
the  extent  required  from time to time to enable  such  Person to sell  Shares
without  registration  under the  Securities  Act within the  limitation  of the
exemptions provided by Rule 144 promulgated under the Securities Act.

     8.   Miscellaneous.

          (a)  Failure to File  Registration  Statement  and Other  Events.  The
Company  and the  Purchaser  agree that the Holders  will suffer  damages if the
Registration  Statement  is not  filed on or prior  to the  Filing  Date and not
declared  effective by the Commission on or prior to the Effectiveness  Date and
maintained in the manner contemplated herein during the Effectiveness  Period or
if certain other events occur. The Company and the Holders further agree that it
would not be feasible to ascertain  the extent of such  damages with  precision.
Accordingly,  if (i) the Registration  Statement is not filed on or prior to the
Filing Date, or is not declared  effective by the  Commission on or prior to the
Effectiveness  Date,  or (ii) the Company  fails to file with the  Commission  a
request for  acceleration  in  accordance  with Rule 461  promulgated  under the
Securities  Act within  five (5)  Business  Days of the date that the Company is
notified  (orally or in writing,  whichever is earlier) by the Commission that a
Registration  Statement will not be "reviewed," or not subject to further review
(any such failure  being  referred to as an "Event"),  the Company  shall pay as
liquidated  damages  for such  failure  and not



                                      -10-


as a penalty  (the  "Liquidated  Damages") to each Holder an amount equal to two
percent (2%) of such  Holder's pro rata share of the purchase  price paid by all
Holders for the Shares  purchased  pursuant to the Purchase  Agreement  for each
thirty (30) day period  following such Event until the applicable Event has been
cured, which amount shall be pro rated for any period less than thirty (30) days
(the "Periodic Amount"). Payments to be made pursuant to this Section 7(a) shall
be due and  payable  immediately  upon  demand in cash or, at the  option of the
Holder,  in shares of Common Stock.  The parties agree that the Periodic  Amount
represents a reasonable  estimate on the part of the parties,  as of the date of
this Agreement,  of the amount of damages that may be incurred by the Holders if
the  Registration  Statement  is not filed on or prior to the Filing Date or has
not been declared  effective by the Commission on or prior to the  Effectiveness
Date.

          (b) Remedies.  In the event of a breach by the Company or by a Holder,
of any of their obligations under this Agreement, each Holder or the Company, as
the case may be, in addition to being entitled to exercise all rights granted by
law and under this Agreement, including recovery of damages, will be entitled to
specific  performance of its rights under this  Agreement.  The Company and each
Holder agree that monetary damages would not provide  adequate  compensation for
any losses incurred by reason of a breach by it of any of the provisions of this
Agreement  and  hereby  further  agrees  that,  in the event of any  action  for
specific  performance in respect of such breach, it shall waive the defense that
a remedy at law would be adequate.

          (c) Specific Enforcement, Consent to Jurisdiction.

             (i)  The  Company  and  the  Holders  acknowledge  and  agree  that
irreparable  damage would occur in the event that any of the  provisions of this
Agreement  were not performed in accordance  with their  specific  terms or were
otherwise breached.  It is accordingly agreed that the parties shall be entitled
to an injunction or injunctions to prevent or cure breaches of the provisions of
this Agreement and to enforce  specifically  the terms and provisions  hereof or
thereof,  this being in addition to any other remedy to which any of them may be
entitled by law or equity.

             (ii) Each of the Company  and the  Holders  (i) hereby  irrevocably
submits to the jurisdiction of the United States District Court for the Southern
District of New York and the courts of the State of New York located in New York
county for the  purposes  of any suit,  action or  proceeding  arising out of or
relating to this Agreement and (ii) hereby  waives,  and agrees not to assert in
any such suit, action or proceeding, any claim that it is not personally subject
to the  jurisdiction  of such  court,  that the suit,  action or  proceeding  is
brought  in an  inconvenient  forum or that the  venue of the  suit,  action  or
proceeding is improper.  Each of the Company and the Holders consents to process
being served in any such suit, action or proceeding by mailing a copy thereof to
such party at the address in effect for notices to it under this  Agreement  and
agrees that such service shall constitute good and sufficient service of process
and notice  thereof.  Nothing in this Section shall affect or limit any right to
serve process in any other manner permitted by law.

          (d)  Amendments  and  Waivers.   The  provisions  of  this  Agreement,
including  the  provisions  of this  sentence,  may not be amended,  modified or
supplemented,  and waivers or



                                      -11-


             consents to departures from the provisions hereof may not be given,
unless the same shall be in writing and signed by the Company and Holders of not
less  51%  of  the   Registrable   Securities   then   owned  by  all   Holders.
Notwithstanding the foregoing, a waiver or consent to depart from the provisions
hereof  with  respect  to a matter  that  relates  exclusively  to the rights of
Holders  and that does not  directly  or  indirectly  affect the rights of other
Holders  may be  given by  Holders  of at least a  majority  of the  Registrable
Securities to which such waiver or consent relates; provided,  however, that the
provisions of this sentence may not be amended, modified, or supplemented except
in accordance with the provisions of the immediately preceding sentence.

          (e) Notices. Any and all notices or other communications or deliveries
required or permitted to be provided  hereunder shall be in writing and shall be
deemed given and  effective on the earlier of (i) the date of  transmission,  if
such  notice or  communication  is  delivered  via  facsimile  at the  facsimile
telephone number specified for notice prior to 5:00 p.m., New York City time, on
a Business  Day, (ii) the Business Day after the date of  transmission,  if such
notice or  communication  is delivered via facsimile at the facsimile  telephone
number  specified  for notice later than 5:00 p.m.,  New York City time,  on any
date and earlier than 11:59 p.m.,  New York City time,  on such date,  (iii) the
Business Day  following the date of mailing,  if sent by  nationally  recognized
overnight  courier  service  or (iv)  actual  receipt  by the party to whom such
notice is required to be given. The addresses for such  communications  shall be
with respect to each Holder at its address set forth under its name on Exhibit A
to the Purchase Agreement, or with respect to the Company, addressed to:

          Xybernaut Corporation
          12701 Fair Lakes Circle
          Suite 550
          Fairfax, Virginia  22033
          Attention:  John F. Moynahan
          Facsimile no.:  (703) 631-3903

or to such other address or addresses or facsimile number or numbers as any such
party may most recently have  designated in writing to the other parties  hereto
by such notice.  Copies of notices to any Holder shall be sent to the  addresses
set forth on the signature pages to the Purchase Agreement. Copies of notices to
the Company shall be sent to:


          Xybernaut Corporation
          12701 Fair Lakes Circle
          Suite 550
          Fairfax, Virginia  22033
          Attention:  Dr. Steven A. Newman
          Facsimile no.:  (703) 631-3903

          and



                                      -12-


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

          (f) Successors and Assigns.  This Agreement  shall be binding upon and
inure to the benefit of the parties and their successors and permitted  assigns.
Permitted  assigns of the  Company  shall  include  any  person or entity  which
acquires all or substantially  all of the capital stock or assets of the Company
or is the  successor to the Company by merger,  consolidation  or other  similar
transaction. No Holder shall assign its rights hereunder, by operation of law or
otherwise, without the prior written consent of the Company.

          (g)  Counterparts.  This  Agreement  may be  executed in any number of
counterparts,  each of which when so executed  shall be deemed to be an original
and, all of which taken together shall constitute one and the same Agreement. In
the event that any  signature  is  delivered  by  facsimile  transmission,  such
signature shall create a valid binding  obligation of the party executing (or on
whose behalf such signature is executed) the same with the same force and effect
as if such facsimile signature were the original thereof.

          (h) Governing Law. This  Agreement  shall be governed by and construed
in  accordance  with the laws of the State of New York  applicable  to contracts
made and to be performed  entirely within the State of New York,  without regard
to its conflicts of law  principles.  This Agreement shall not be interpreted or
construed  with any  presumption  against the party causing this Agreement to be
drafted.

          (i) Cumulative  Remedies.  The remedies provided herein are cumulative
and not exclusive of any remedies provided by law.

          (j) Severability.  If any term, provision,  covenant or restriction of
this  Agreement is held to be invalid,  illegal,  void or  unenforceable  in any
respect, the remainder of the terms, provisions,  covenants and restrictions set
forth  herein  shall  remain  in full  force and  effect  and shall in no way be
affected,  impaired  or  invalidated,  and the  parties  hereto  shall use their
reasonable  efforts to find and employ an alternative  means to achieve the same
or substantially the same result as that  contemplated by such term,  provision,
covenant  or  restriction.  It is  hereby  stipulated  and  declared  to be  the
intention of the parties  that they would have  executed  the  remaining  terms,
provisions, covenants and restrictions without including any of such that may be
hereafter declared invalid, illegal, void or unenforceable.

          (k) Headings.  The headings  herein are for  convenience  only, do not
constitute a part of this  Agreement  and shall not be deemed to limit or affect
any of the provisions hereof.




                  [Remainder of Page Intentionally Left Blank]


                                      -13-




          IN WITNESS WHEREOF,  the parties hereto have caused this  Registration
Rights Agreement to be duly executed by their respective  authorized  persons as
of the date first indicated above.

                                  XYBERNAUT CORPORATION



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



                                  ALPHA CAPITAL AKTIENGESELLSCHAFT



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




                                      -14-