Exhibit 10.1

                          REGISTRATION RIGHTS AGREEMENT

            THIS REGISTRATION RIGHTS AGREEMENT,  dated May 15, 1998, between the
person  and/or  entity  whose name and  address  appears on the  signature  page
attached hereto (individually a "Holder" or collectively with the holders of the
other Securities issued pursuant to a 5% Convertible  Preferred Stock and Common
Stock Purchase Agreement of even date herewith, as defined below, the "Holders")
and Xybernaut Corporation,  a corporation having its principle place of business
at 12701 Four Lakes Circle, Fairfax, VA 22033.

            WHEREAS,  simultaneously  with the  execution  and  delivery of this
Agreement,  the  Holders  are  purchasing  from the  Company,  pursuant  to a 5%
Convertible  Preferred Stock Securities Purchase Agreement dated the date hereof
(the "Agreement"), 110,294 shares of Common Stock, par value $.01 per share (the
"Common  Shares")  at a price of $3.40  per  share,  and 375  shares of Series C
Preferred  Stock of the  Company,  par value  $.01 per share  (the  "Convertible
Preferred  Stock") at a price of $1,000 per share,  each share  convertible into
one share of the  Company's  Common  Stock,  $0.01  par  value  per  share  (the
"Conversion  Shares" , and,  collectively with the Common Shares, the "Shares"),
for an aggregate purchase price of $750,000; and

            WHEREAS,   the   Company   desires  to  grant  to  the  Holders  the
registration rights set forth herein with respect to the Shares.

            NOW, THEREFORE, the parties hereto mutually agree as follows:

            Section  1.  Registrable   Securities.   As  used  herein  the  term
"Registrable Security" means each of the Conversion Shares;  provided,  however,
that with respect to any particular  Registrable  Security,  such security shall
cease to be a Registrable Security when, as of the date of determination, (i) it
has been  effectively  registered  under the  Securities Act of 1933, as amended
(the "Securities Act") and disposed of pursuant thereto, (ii) registration under
the Securities Act is no longer required for the immediate  public  distribution
of such  security  as a result of the  provisions  of Rule 144,  or (iii) it has
ceased to be outstanding. The term "Registrable Securities" means any and/or all
of the  securities  falling  within the foregoing  definition of a  "Registrable
Security."   In  the  event  of  any  merger,   reorganization,   consolidation,
recapitalization  or other change  affecting the Common Stock,  such  adjustment
shall be made in the definition of  "Registrable  Security" as is appropriate in
order to prevent any dilution or enlargement  of the rights granted  pursuant to
this Section 1.

            Section 2.  Restrictions on Transfer.  The Holder  acknowledges  and
understands that unless registered, the Conversion Shares, Common Shares and the
Convertible  Preferred Stock are "restricted  securities" as defined in Rule 144
promulgated  under  the Act.  The  Holder  understands  that no  disposition  or
transfer of the Common Shares,  Conversion  Shares or the Convertible  Preferred
Stock  may be made  by  Holder  in the  absence  of (i) an  opinion  of  counsel
reasonably  satisfactory to the Company that such transfer may be made or (ii) a
registration  statement  under the Securities Act is then in effect with respect
thereto.

            Section 3.  Registration  Rights.  (a) The Company shall prepare and
file a registration statement (the "Registration Statement") with the Securities
and Exchange  Commission  ("SEC"),  on one occasion,  at the sole expense of the
Company  (except as provided in Section 3(c) hereof),  in respect of all holders
of Registrable  Securities,  so as to permit a non-underwritten  public offering
and sale of the Registrable  Securities under the Act. The number of Registrable
Securities  to be registered  shall be one hundred  fifty (150%)  percent of the
number of shares that would be required if all the  Registrable  Securities were
converted  at a  price  of  $3.40  per  share  on  the  effective  date  of  the
Registration Statement.







            (b)   The  Company  will  maintain  any  Registration  Statement  or
post-effective  amendment  filed under this Section 3 hereof  current  under the
Securities  Act until the  earlier  of (i) the date that all of the  Registrable
Securities have been sold pursuant to the Registration Statement,  (ii) the date
the  holders  thereof  receive  an  opinion  of  counsel  that  the  Registrable
Securities  may be sold  under the  provisions  of Rule 144 or (iii) the  second
anniversary of the effective date of the Registration Statement.

            (c)   All fees,  disbursements and out-of-pocket  expenses and costs
incurred by the Company in  connection  with the  preparation  and filing of any
Registration  Statement under subparagraph 3(a) and in complying with applicable
securities  and Blue Sky laws  (including,  without  limitation,  all attorneys'
fees)  shall  be  borne  by the  Company.  The  Holder  shall  bear  the cost of
underwriting  discounts and commissions,  if any,  applicable to the Registrable
Securities  being  registered  and the fees and  expenses  of its  counsel.  The
Company shall use its best efforts to qualify any of the  securities for sale in
such   states  as  such  Holder   reasonably   designates   and  shall   furnish
indemnification in the manner provided in Section 6 hereof. However, the Company
shall not be required  to qualify in any state  which will  require an escrow or
other restriction relating to the Company and/or the sellers. The Company at its
expense will supply the Holder with copies of such  Registration  Statement  and
the prospectus or offering circular included therein and other related documents
in such quantities as may be reasonably requested by the Holder.

            (d)   The Company shall not be required by this Section 3 to include
a Holder's Registrable  Securities in any Registration  Statement which is to be
filed if, in the opinion of counsel for the  Company  the  proposed  offering or
other  transfer  as to which  such  registration  is  requested  is exempt  from
applicable  federal and state securities laws and would result in all purchasers
or transferees  obtaining securities which are not "restricted  securities",  as
defined in Rule 144 under the Securities Act.

            (e)   In the event  the  Registration  Statement  to be filed by the
Company  pursuant to Section 3 (a) above is not  declared  effective  by the SEC
within ninety (90) days of the Closing Date, as defined in the Agreement,  then,
unless waived by Holder,  the Company will pay Holder, as liquidated damages for
such failure and not as a penalty, two (2%) percent of the outstanding principal
amount of the  Preferred  Shares for each  month  thereafter  until the  Company
procures registration of the Conversion Shares.

            If the Company does not remit the damages to the Holder as set forth
above,  the  Company  will pay the  Holder's  reasonable  costs  of  collection,
including  attorneys fees, in addition to the liquidated  damages.  Such payment
shall be made to the Holder  immediately if the  registration  of the Conversion
Shares are not effected;  provided, however, that the payment of such liquidated
damages  shall not relieve  the Company  from its  obligations  to register  the
Conversion  Shares pursuant to this Section.  The registration of the Conversion
Shares  pursuant  to this  provision  shall not affect or limit  Holder's  other
rights or remedies as set forth in this Agreement.  Any payment pursuant to this
Section 3(e) shall be made either in cash or paid in additional shares of Common
Stock at the discretion of the Company.

            (f)   No provision  contained herein shall preclude the Company from
selling  securities  pursuant  to any  Registration  Statement  in  which  it is
required to include Registrable Securities pursuant to this Section 3.

            Section 4. Cooperation with Company. Holders will cooperate with the
Company in all respects in connection  with this  Agreement,  including,  timely
supplying all information  reasonably requested by the Company and executing and
returning all documents reasonably requested in connection with the registration
and sale of the Registrable Securities.





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            Section 5. Registration  Procedures.  If and whenever the Company is
required by any of the provisions of this  Agreement to effect the  registration
of any of the Registrable Securities under the Act, the Company shall (except as
otherwise provided in this Agreement), as expeditiously as possible:

            (a)   prepare and file with the SEC such  amendments and supplements
to such registration  statement and the prospectus used in connection  therewith
as may be necessary to keep such registration  statement effective and to comply
with the provisions of the Act with respect to the sale or other  disposition of
all securities  covered by such  registration  statement  whenever the Holder or
Holders of such securities shall desire to sell or otherwise dispose of the same
(including  prospectus  supplements with respect to the sales of securities from
time to time in connection with a registration statement pursuant to Rule 415 of
the SEC);

            (b)   furnish  to each  Holder  such  numbers of copies of a summary
prospectus  or other  prospectus,  including  a  preliminary  prospectus  or any
amendment or supplement to any prospectus,  in conformity with the  requirements
of the Act, and such other documents,  as such Holder may reasonably  request in
order to facilitate the public sale or other disposition of the securities owned
by such Holder;

            (c)   use its best  efforts to register  and qualify the  securities
covered by such  registration  statement under such other securities or blue sky
laws of such jurisdictions as the Holder,  shall reasonably request,  and do any
and all other acts and things which may be necessary or advisable to enable each
Holder to consummate the public sale or other  disposition in such  jurisdiction
of the  securities  owned by such Holder,  except that the Company shall not for
any such purpose be required to qualify to do business as a foreign  corporation
in any  jurisdiction  wherein  it is not so  qualified  or to file  therein  any
general consent to service of process;

            (d)   use its best efforts to list such  securities on NASDAQ or any
securities  exchange on which any  securities of the Company is then listed,  if
the  listing  of such  securities  is then  permitted  under  the  rules of such
exchange or NASDAQ;

            (e)   enter into and perform its  obligations  under an underwriting
agreement,  if the offering is an underwritten  offering, in usual and customary
form,  with  the  managing  underwriter  or  underwriters  of such  underwritten
offering;

            (f)   notify each Holder of Registrable  Securities  covered by such
registration  statement,  at any time when a prospectus relating thereto covered
by such registration statement is required to be delivered under the Act, of the
happening  of any  event of  which it has  knowledge  as a result  of which  the
prospectus included in such registration  statement, as then in effect, includes
an  untrue  statement  of a  material  fact or omits to  state a  material  fact
required to be stated  therein or necessary to make the  statements  therein not
misleading in the light of the circumstances then existing.

            Section 6. Indemnification.

            (a)   In the event of the filing of any Registration  Statement with
respect to  Registrable  Securities  pursuant  to Section 3 hereof,  the Company
agrees to  indemnify  and hold  harmless  the  Holder  ("Distributing  Holders")
against any losses,  claims,  damages or  liabilities,  joint or several  (which
shall, for all purposes of this Agreement,  include,  but not be limited to, all
reasonable costs of defense and investigation and all attorneys' fees), to which
the  Distributing  Holders  may  become  subject,  under the  Securities  Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect  thereof) arise out of or are based upon any untrue statement or alleged
untrue  statement  of any  material  fact  contained  in any  such  Registration
Statement,  or any related preliminary  prospectus,  final prospectus,  offering
circular,  notification or amendment or supplement  thereto,  or arise out of or
are based upon the omission or alleged omission to state therein a material fact
required to be stated therein or necessary to make the statements therein not



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misleading;  provided,  however,  that the Company will not be liable (i) in any
such case to the extent that any such loss,  claim,  damage or liability  arises
out of or is based upon an untrue  statement  or  alleged  untrue  statement  or
omission or alleged omission made in such  Registration  Statement,  preliminary
prospectus,  final prospectus,  offering circular,  notification or amendment or
supplement thereto in reliance upon, and in conformity with, written information
furnished to the Company by the  Distributing  Holders,  specifically for use in
the  preparation  thereof,  or (ii) to pay any amounts paid in settlement of any
loss,  claim,  damage or liability if such  settlement  is effected  without the
consent of the  Company.  This  indemnity  agreement  will be in addition to any
liability which the Company may otherwise have.

            (b)   Each  Distributing  Holder  agrees that it will  indemnify and
hold harmless the Company, and each officer, director of the Company against any
losses,  claims,  damages or liabilities  (which shall, for all purposes of this
Agreement,   include,   but  not  be  limited  to,  all  costs  of  defense  and
investigation and all attorneys' fees) to which the Company or any such officer,
or director may become subject under the Securities Act or otherwise, insofar as
such losses  claims,  damages or  liabilities  (or actions in respect  thereof);
arise out of or are based upon any untrue  statement or alleged untrue statement
of any material fact  contained in a  Registration  Statement  requested by such
Distributing  Holder, or any related preliminary  prospectus,  final prospectus,
offering circular, notification or amendment or supplement thereto, or arise out
of or are based upon the  omission  or the alleged  omission to state  therein a
material fact required to be stated  therein or necessary to make the statements
therein  not  misleading,  but in each case only to the extent  that such untrue
statement or alleged untrue  statement or omission or alleged  omission was made
in  such  Registration  Statement,  preliminary  prospectus,  final  prospectus,
offering  circular,  notification or amendment or supplement thereto in reliance
upon, and in conformity with,  written  information  furnished to the Company by
such Distributing  Holder,  specifically for use in the preparation thereof and,
provided further,  that the indemnity  agreement  contained in this Section 6(b)
shall not  inure to the  benefit  of the  Company  with  respect  to any  person
asserting such loss,  claim,  damage or liability who purchased the  Registrable
Securities  which are the subject  thereof if the Company failed to send or give
(in violation of the  Securities  Act or the rules and  regulations  promulgated
thereunder) a copy of the prospectus contained in such Registration Statement to
such person at or prior to the written  confirmation  to such person of the sale
of such Registrable  Securities,  where the Company was obligated to do so under
the Securities Act or the rules and  regulations  promulgated  thereunder.  This
indemnity  agreement will be in addition to any liability which the Distributing
Holders may otherwise have.

            (c)   Promptly  after  receipt by an  indemnified  party  under this
Section 6 of notice of the commencement of any action,  such  indemnified  party
will, if a claim in respect thereof is to be made against the indemnifying party
under this Section 6, notify the indemnifying party of the commencement thereof,
but the  omission  so to notify  the  indemnifying  party will not  relieve  the
indemnifying party from any liability which it may have to any indemnified party
otherwise than as to the  particular  item as to which  indemnification  is then
being  sought  solely  pursuant  to this  Section 6. In case any such  action is
brought against any indemnified party, and it notifies the indemnifying party of
the commencement thereof, the indemnifying party will be entitled to participate
in,  and, to the extent that it may wish,  jointly  with any other  indemnifying
party similarly notified,  assume the defense thereof, subject to the provisions
herein stated and after notice from the  indemnifying  party to such indemnified
party of its election so to assume the defense thereof,  the indemnifying  party
will not be liable to such indemnified  party under this Section 6 for any legal
or  other  reasonable  out-of-pocket  expenses  subsequently  incurred  by  such
indemnified  party in connection  with the defense thereof other than reasonable
costs of  investigation,  unless  the  indemnifying  party  shall not pursue the
action to its final  conclusion.  The indemnified  party shall have the right to
employ  separate  counsel in any such action and to  participate  in the defense
thereof,  but the fees and  reasonable  out-of-pocket  expenses of such  counsel
shall not be at the expense of the indemnifying  party if the indemnifying party
has assumed the defense of the action with counsel  reasonably  satisfactory  to
the  indemnified   party;   provided  that  if  the  indemnified  party  is  the
Distributing  Holder,  the reasonable  fees and  out-of-pocket  expenses of such
counsel shall be at the expense of the indemnifying  party if (i) the employment
of such counsel has been specifically  authorized in writing by the indemnifying
party,  or (ii) the named  parties to any such action  (including  any impleaded
parties) include both



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the Distributing  Holder and the indemnifying party and the Distributing  Holder
shall  have been  advised  by such  counsel  that there may be one or more legal
defenses  available to the indemnifying party different from or in conflict with
any legal defenses which may be available to the  Distributing  Holder (in which
case the  indemnifying  party  shall not have the right to assume the defense of
such action on behalf of the Distributing Holder, it being understood,  however,
that the  indemnifying  party shall,  in connection  with any one such action or
separate but  substantially  similar or related actions in the same jurisdiction
arising out of the same general allegations or circumstances, be liable only for
the reasonable fees and out-of-pocket expenses of one separate firm of attorneys
for the  Distributing  Holder,  which firm shall be designated in writing by the
Distributing  Holder).  No settlement of any action against an indemnified party
shall be made without the prior written consent of the indemnified  party, which
consent shall not be unreasonably withheld.

            Section 7.  Notices.  Any notice  pursuant to this  Agreement by the
Company  or by the Holder  shall be in writing  and shall be deemed to have been
duty given if  delivered  by (i) hand,  (ii) by  facsimile  and followed by mail
delivery,  or (iii) if mailed  by  certified  mail,  return  receipt  requested,
postage prepaid, addressed as follows:

            (a)   If to the Holder,  to its, his or her address set forth on the
signature page of this  Agreement,  with a copy to the person  designated in the
Agreement.

            (b)   If to the Company,

                           at  Xybernaut  Corporation,

                           12701 Four Lakes Circle

                           Fairfax,  VA 22033

                           Attn:  Edward G. Newman,  President,

                           (tele) (703) 631-6925

                           (fax) (703)  631-7070

                           and a copy to

                           Parker Chapin Flattau & Klimpl, LLP

                           1211  Avenue of the  Americas

                           New  York,  NY 10036

                           Attn:  Martin  Eric Weisberg,  Esq.

            or to such other  address as any such party may  designate by notice
to the other party. Notices shall be deemed given at the time they are delivered
personally or five (5) days after they are mailed in the manner set forth above.
If notice is  delivered  by  facsimile  to the  Company  and  followed  by mail,
delivery shall be deemed given two (2) days after such facsimile is sent.




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            Section 8. Assignment.  This Agreement is binding upon and inures to
the benefit of the parties  hereto and their  respective  heirs,  successors and
permitted assigns. This Agreement cannot be assigned, amended or modified by the
parties  hereto,  except  by  written  agreement  executed  by the  parties.  If
requested  by the  Company,  the Holder  shall have  furnished to the Company an
opinion of counsel reasonably satisfactory to the Company to such effect.

            Section 9. Conflicts.  In the event of any inconsistency or conflict
between the terms and provisions of this Agreement, and the terms and provisions
of the  Purchase  Agreement or the  Certificate  of  Designation,  the terms and
provisions of the Certificate of Designation shall prevail.

            Section  10.   Counterparts.   This  Agreement  may  be  executed  i
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.

            Section  11.  Headings.  The  Headings  in  this  Agreement  are for
reference  purposes  only  and  shall  not  affect  in any  way the  meaning  or
interpretation of this Agreement.

            Section 12.  Governing Law; Venue.  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 such State, without regard
to its  principles of conflicts of laws.  Each of the parties hereto agrees that
ion the event of any dispute arising hereunder venue shall be New York, New York
and each party hereby submits to the  jurisdiction  of the United States Federal
Court in the Southern District of New York.

            Section 13.  Severability.  If any provision of this Agreement shall
for  any  reason  be  held  invalid  or   unenforceable,   such   invalidity  or
unenforceability  shall not affect any other provision hereof and this Agreement
shall be construed as if such invalid or unenforceable  provision had never been
contained herein.









                                  [End of Page]

                            [Signature page follows]




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            IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed, on the day and year first written.



                                              XYBERNAUT CORPORATION





                                              By _____________________________

                                                     Officer





                                              LIBERTYVIEW PLUS FUND, Purchaser





                                              By _____________________________

                                                     Officer



                                              Address: Libertyview Plus Fund

                                              c/o Libertyview Capital Management

                                              101 Hudson Street

                                              Suite #3700

                                              Jersey City, New Jersey 07302

                                              (tele) 201-200-9093

                                              (fax) 201-200-1140








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                                              LIBERTYVIEW FUND, LLC, Purchaser





                                              By _____________________________

                                                     Officer





                                              CPR (USA) INC., Purchaser





                                              By _____________________________
                                                     Officer








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