Document:

Exhibit 4.3

                   SENIOR DEBT REGISTRATION RIGHTS AGREEMENT

           AGREEMENT by and among Summus, Inc. (USA), a Florida corporation (the
"Company"), and the holder of the Company's Senior Convertible Debt and Common
Stock, whose name is set forth on the signature page to this Agreement
("Holder").

                              W I T N E S S E T H:
                               -------------------

           WHEREAS, the Company has sold certain amounts of it Senior
Convertible Debt (the "Convertible Debt"), which is convertible into shares of
its common stock, par value $.001 per share (the "Convertible Shares"), and
certain shares of its common stock (the "Common Stock") to the Holder under a
Subscription Agreement dated May 3, 2004 (the "Subscription Agreement"); and

         WHEREAS, in connection with the Subscription Agreement dated as of the
date hereof, the Company intends to register

                  (i) the shares of the Company's Common Stock which were issued
         in connection with the Convertible Debt; and

                  (ii) the Convertible Shares as set forth on Schedule 1 hereto.

         NOW THEREFORE, in consideration of the premises and the mutual terms
and provisions hereof, the parties hereto hereby agree as follows:

         1. DEFINITIONS. For purposes of this Agreement, the following terms
shall have the following respective meanings:

         (a) "Act" shall mean the Securities Act of 1933, as amended, or any
similar federal statute enacted hereafter, and the rules and regulations of the
Commission thereunder, all as the same shall be in effect from time to time.

         (b) "Commission" shall mean the Securities and Exchange Commission or
any other federal agency at the time administering the Act.

         (c) "Exchange Act" shall mean the Securities Exchange of 1934, as
amended, or any similar federal statute enacted hereafter, and the rules and
regulations of the Commission thereunder, all as the same shall be in effect
from time to time.

         (d) The terms "register," "registered" and "registration" refer to a
registration effected by preparing and filing a registration statement in
compliance with the Act and the declaration or ordering of effectiveness of such
registration statement by the Commission.

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         2. REGISTRATION. The Company shall use its best efforts to file a
registration statement on Form S-1, or such other form designated by the
Commission that the Company is eligible to use, for the shares of Common Stock
and the Convertible Shares set forth on Schedule 1, within sixty (60) days of
the receipt by the Company of $2,000,000 ($1,000,000 of which shall be placed
into escrow pursuant to the Subscription Agreement by and between the parties
hereto and the Escrow Agreement by and among the Holder, the Company and
American Stock Transfer as the escrow agent). The Holder acknowledges and
understands that: (i) the Company shall register only the shares of Common Stock
and the Convertible Shares as set forth on Schedule 1 hereto in fulfillment of
its obligations to register the Holder's securities under this Agreement or any
agreement; and (ii) the Company shall be under no additional obligation to
register any other securities of the Company held by Holder, including, without
limitation, options or other rights of the Holder to acquire securities of the
Company.

         3. FURNISH INFORMATION. The Holder shall furnish to the Company such
information regarding Holder, Holder's officers, directors, shareholders, family
members, and affiliates, as applicable, the Convertible Debt, the Common Stock
and the Convertible Shares and the intended method of disposition of the shares
of Common Stock and the Convertible Shares as the Company shall reasonably
request and as shall be required in connection with the actions to be taken by
the Company.

         4. SUSPENSION OF DISPOSITION OF SHARES. Holder agrees that, upon
receipt of any notice from the Company, of (a) the happening of any event as a
result of which the prospectus included in such registration statement contains
an untrue statement of a material fact or omits any fact necessary to make the
statements therein not misleading, (b) any requests by the Commission for
amendments or supplements to the registration statement or the prospectus or for
additional information, (c) the issuance of any stop order suspending the
effectiveness of the registration statement, (d) the information in the
registration statement no longer being sufficient to permit continued sales
under the registration statement, or (e) the receipt by the Company of any
notification with respect to the suspension of the qualification of the shares
of Common Stock or the Convertible Shares for sale in any jurisdiction, Holder
will forthwith discontinue disposition of the shares of Common Stock or
Convertible Shares until the Company notifies the Holder in writing that such
sales may continue. If so directed by the Company, such Holder will deliver to
the Company (at the expense of the Company) all copies, other than permanent
file copies then in such Holder's possession, of the prospectus covering such
shares of Common Stock or Convertible Shares current at the time of receipt of
such notice.

         5. EXPENSES OF REGISTRATION. All reasonable expenses, other than
underwriting discounts and commissions, incurred in connection with
registrations, filings or qualifications pursuant to Section 2, including,
without limitation, all registration, listing and qualification fees, printers
and accounting fees and the fees and disbursements of counsel for the Company
shall be borne by the Company. The Holder shall bear the fees and disbursements
of its own counsel.

         6. LIMITATION OF THE COMPANY'S OBLIGATIONS. The Company shall not be
obligated under this Agreement to register or include in any registration
statement Shares that Holder has

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requested to be registered if the Company shall furnish Holder with a written
opinion of counsel reasonably satisfactory to Holder, that all shares of Common
Stock and Convertible Shares that Holder holds may be publicly offered, sold and
distributed without registration under the Act pursuant to Rule 144 promulgated
by the Commission under the Act without restriction as to the amount of
securities that can be sold.

         7. INDEMNIFICATION.

                  (a) Except in the case of a sale by Holder in violation of
Section 4 hereof, the Company agrees to indemnify and hold harmless Holder, its
directors, its officers and each person, if any, who controls any Holder within
the meaning of Section 15 of the Act or Section 20 of the Exchange Act, from and
against any and all losses, claims, damages, liabilities and judgments
(including, without limitation, any reasonable legal or other expenses incurred
in connection with investigating or defending any matter, including any action,
that could give rise to any such losses, claims, damages, liabilities or
judgments) caused by any untrue statement of a material fact contained in the
registration statement filed by the Company pursuant to Section 2, including any
preliminary prospectus or final prospectus contained therein (or any amendment
thereto), or caused by any omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading except insofar as such losses, claims, damages,
liabilities or judgments are caused by any such untrue statement or omission or
alleged untrue statement or omission based upon information relating to any
Holder furnished in writing to the Company by such Holder expressly for use
therein.

                  (b) Holder agrees to indemnify and hold harmless the Company,
its directors, its officers and each person, if any, who controls the Company
within the meaning of Section 15 of the Act or Section 20 of the Exchange Act,
from and against any and all losses, claims, damages, liabilities and judgments
(including, without limitation, any legal or other expenses incurred in
connection with investigating or defending any matter, including any action,
that could give rise to any such losses, claims, damages, liabilities or
judgments) caused by any untrue statement of a material fact contained in the
registration statement filed pursuant to Section 2, including any preliminary
prospectus or final prospectus contained therein (or any amendment thereto), or
caused by any omission or alleged omission to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading, but only with respect to losses, claims, damages, liabilities and
judgments caused by an untrue statement or omission or alleged untrue statement
or omission based on information relating to such Holder furnished in by or on
behalf of such Holder expressly for use in the registration statement filed
pursuant to Section 2, including any preliminary prospectus or final prospectus
contained therein (or any amendment thereto).

                  (c) In case any action shall be commenced involving any person

in respect of which indemnity may be sought pursuant to Sections 7(a) and 7(b)
(the "Indemnified Party"), the indemnified party shall promptly notify the
person against whom such indemnity may be sought (the "Indemnifying Party") in
writing and the Indemnifying Party shall assume the defense of such action,
including the employment of counsel reasonably satisfactory to the Indemnified
Party and the payment of all reasonable fees and expenses of such counsel, as
incurred. Any Indemnified

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Party shall have the right to employ separate counsel in any such action and
participate in the defense thereof, but the fees and expenses of such counsel
shall be at the expense of the Indemnified Party unless (i) the employment of
such counsel shall have been specifically authorized in writing by the
Indemnifying Party, (ii) the Indemnifying Party shall have failed to assume the
defense of such action or employ counsel reasonably satisfactory to the
Indemnified Party or (iii) the named parties to any such action (including any
impleaded parties) include both the Indemnified Party and the Indemnifying
Party, and the Indemnified Party shall have been advised by such counsel that
there may be one or more legal defenses available to it which are different from
or additional to those available to the Indemnifying Party (in which case the
Indemnifying Party shall not have the right to assume the defense of such action
on behalf of the Indemnified Party). In any such case, the Indemnifying Party
shall not, in connection with any one action or separate but substantially
similar or related actions in the same jurisdiction arising out of the same
general allegations or circumstances, be liable for (i) the reasonable fees and
expenses of more than one separate firm of attorneys (in addition to any local
counsel) for (x) the Company, its directors, its officers and all persons, if
any, who control the Company within the meaning of either such Section, and
(iii) the reasonable fees and expenses of more than one separate firm of
attorneys (in addition to any local counsel) for the Shareholders, and all such
fees and expenses shall be reimbursed as they are incurred. The Indemnifying
Party shall indemnify and hold harmless the Indemnified Party from and against
any and all losses, claims, damages, liabilities and judgments by reason of any
settlement of any action (i) effected with its written consent or (ii) effected
without its written consent if the settlement is entered into more than twenty
business days after the Indemnifying Party shall have received a written request
from the Indemnified Party for reimbursement for the fees and expenses of
counsel (in any case where such fees and expenses are at the expense of the
Indemnifying Party) and, prior to the date of such settlement, the Indemnifying
Party shall have failed to comply with such reimbursement request. No
Indemnifying Party shall, without the prior written consent of the Indemnified
Party, effect any settlement or compromise of, or consent to the entry of
judgment with respect to, any pending or threatened action in respect of which
the Indemnified Party is or could have been a party and indemnity or
contribution may be or could have been sought hereunder by the Indemnified
Party, unless such settlement, compromise or judgment (i) includes an
unconditional release of the Indemnified Party from all liability on claims that
are or could have been the subject matter of such action and (ii) does not
include a statement as to or an admission of fault, culpability or a failure to
act, by or on behalf of the Indemnified Party.

                  (d) To the extent the indemnification provided for in this
Section 7 is unavailable (other than in accordance with the terms hereof) to an
Indemnified Party or insufficient in respect of any losses, claims, damages,
liabilities or judgments referred to therein, then each Indemnifying Party, in
lieu of indemnifying such Indemnified Party, shall contribute to the amount paid
or payable by such Indemnified Party as a result of such losses, claims,
damages, liabilities and judgments (i) in such proportion as is appropriate to
reflect the relative benefits received by the Indemnifying Party or parties on
the one hand and the Indemnified Party or parties on the other

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<PAGE>

hand from the offering of the Shares or (ii) if the allocation provided by
clause 7(d)(i) above is not permitted by applicable law, in such proportion as
is appropriate to reflect not only the relative benefits referred to in clause
7(d)(i) above but also the relative fault of the Indemnifying Party or parties
on the one hand and the Indemnified Party or parties on the other hand in
connection with the statements or omissions which resulted in such losses,
claims, damages, liabilities or judgments, as well as any other relevant
equitable considerations. The relative fault of the Company and the Holder shall
be determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by the Company or the Holder,
and the parties' relative intent, knowledge, access to information and
opportunity to correct or prevent such statement or omission. The amount paid or
payable by an Indemnified Party as a result of the losses, claims, damages,
liabilities or judgments referred to in the immediately preceding paragraph
shall be deemed to include, subject to the limitations set forth above, any
reasonable legal or other expenses incurred by such Indemnified Party in
connection with investigating or defending any matter, including any action,
that could have given rise to such losses, claims, damages, liabilities or
judgments. No person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Act) shall be entitled to contribution from any person
who was not guilty of such fraudulent misrepresentation.

                  (e) The remedies provided for in this Section 7 are not
exclusive and shall not limit any rights or remedies which may otherwise be
available to any Indemnified Party at law or in equity.

           8. AGREEMENTS OF THE HOLDER. Holder agrees, whether or not the
transactions contemplated in this Agreement are consummated or this Agreement is
terminated, to pay or cause to be paid all reasonable expenses incident to the
performance of the Holder's obligations under this Agreement, including: (i) the
fees, disbursements and expenses of Holder's counsel in connection with the
registration and delivery of the shares of Common Stock or the Convertible
Shares under the Act, (ii) all costs and expenses related to the transfer and
delivery of the shares of Common Stock or the Convertible Shares, including any
transfer or other taxes payable thereon, and (iii) all other costs and expenses
incident to the performance of the obligations of the Holder hereunder for which
provision is not otherwise made in this Section. The provisions of this Section
shall not supersede or otherwise affect any separate agreement that the Company
and any Holder may have for allocation of such expenses among themselves.

           9. AMENDMENTS AND WAIVERS. The provisions of this Agreement,
including the provisions of this sentence, may be amended, modified or
supplemented, and waivers or consents to departures from the provisions hereof
may be given, by written consent of the Company and the Shareholder.

           10. NOTICES. All notices and other communications provided for or
permitted hereunder shall be made in writing by hand-delivery, registered
first-class mall, telex, telecopier, or air courier guaranteeing overnight
delivery:

           (a) if to Holder, at the most current address given by such Holder to
the Company in accordance with the provisions of this Section 10, which address
initially shall be the address given to the Company upon acquisition of the
Shares unless the Holder has notified the Company of a change of address; and

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<PAGE>

         (b) if to the Company, initially at its address set forth below and
thereafter at such other address, notice of which is given in accordance with
the provisions of this Section 10:

                                Summus, Inc. (USA)
                                434 Fayetteville Street Mall
                                Suite 600
                                Raleigh, North Carolina  27601
                                Attention: General Counsel

         All such notices and communications shall be deemed to have been duly
given at the time delivered by hand, if personally delivered; two business days
after being deposited in the mail, postage prepaid, if mailed; when answered
back, if telexed; when receipt acknowledged, if telecopied; and on the next
business day, if timely delivered to an air courier guaranteeing overnight
delivery.

         11. COUNTERPARTS. This Agreement may be executed in one or more
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.

         12. HEADINGS. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

         13. GOVERNING LAW. This Agreement shall be governed by and construed in
accordance with the laws of the State of North Carolina.

         14. SEVERABILITY. In the event that any one or more of the provisions
contained herein, or the application thereof in any circumstance, is held
invalid, illegal or unenforceable, the validity, legality and enforceability of
any such provision in every other respect and of the remaining provisions
contained herein shall not be affected or impaired thereby.

         15. ENTIRE AGREEMENT. This Agreement, in conjunction with the
Subscription Agreement, is intended by the parties as a final expression of
their agreement and intended to be a complete and exclusive statement of the
agreement and understanding of the parties hereto in respect of the subject
matter contained herein. There are no restrictions, promises, warranties or
undertakings, other than those set forth or referred to herein with respect to
the registration rights granted by the Company with respect to the shares of
Common Stock and the Convertible Shares. This Agreement supersedes all prior
agreements and understandings between the parties with respect to registration
of the shares of Common Stock and the Convertible Shares. Nothing in this
Agreement shall preclude the Company from entering into any other agreement
having the same or different terms with any holder of the Company's securities
or any third party with respect to registration rights or related matters.

         16. PARTIES BENEFITED. Nothing in this Agreement, express or implied,
is intended to confer upon any third party any rights, remedies, obligations or
liabilities.

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<PAGE>

           IN WITNESS WHEREOF, the parties have executed this Agreement as of
May __, 2003.

                                    SUMMUS, INC. (USA)

                                      BY: ______________________________
                                               GARY E. BAN
                                               CHIEF EXECUTIVE OFFICER

                                     HOLDER:

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

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<PAGE>

                                   SCHEDULE 1

                             SHARES TO BE REGISTERED

_________         shares of Common Stock of the Company issued in connection
                  with issuance of the Convertible Debt

__________        Convertible Shares pursuant to the conversion of the
                  Convertible Debt

                                       8Exhibit 4.4

                                ESCROW AGREEMENT

       ESCROW AGREEMENT, made the 3rd day of May, 2004, by and among Summus,
Inc. (USA), a Delaware corporation (the "Company"), each of the investors listed
on EXHIBIT A hereto (each an "Investor" and, collectively, the "Investors") and
American Stock Transfer and Trust Company, as Escrow Agent (the "Escrow Agent").

                                             W I T N E S S E T H:

       WHEREAS, the Company is offering up to $2,000,000 of the Company's Senior
Convertible Debt (the "Convertible Debt") and shares of its common stock, $0.01
par value per share, that are issuable in connection with the Convertible Debt
(the "Offering"), pursuant to certain Subscription Agreements with the Investors
(the "Subscription Agreements");

       WHEREAS, the Company and the Investors desire that 50% of the funds
received in the Offering be placed into a segregated account with the Escrow
Agent (the "Escrow Account") until such time as the release or return of such
funds is required pursuant to Section 4 hereof; and

       WHEREAS, the Escrow Agent has consented to act as escrow agent in
connection with the Offering, subject to the terms and conditions hereinafter
set forth;

       NOW, THEREFORE, in consideration of the mutual promises herein made and
intending to be legally bound, the Company, the Investors and the Escrow Agent
hereby agree as follows:

       1. The Company and the Investors hereby appoint the Escrow Agent to serve
as escrow agent in connection with the Offering in accordance with the terms and
conditions herein set forth, and the Escrow Agent hereby accepts such
appointment.

       2. The Investors shall deliver to the Escrow Agent an aggregate amount of
$1,000,000 (the "Escrow Funds") (in the amount set forth next to such Investors'
name as set forth on Exhibit A) to be held and administered by the Escrow Agent
as provided herein. The Escrow Agent shall promptly deposit the Escrow Funds in
the Escrow Account. The Company shall direct the Investors to wire transfer
their portion of the Escrow Funds, in immediately available funds, to:

         JP Morgan Chase
         55 Water Street
         New York, NY
         ABA# ____________
         Account # __________
         Attention: __________

The Escrow Agent shall advise the Company in writing as to the name of each
Investor from whom Escrow Funds has been received.

<PAGE>

       3. The Escrow Account shall be an interest-bearing Money Market Deposit
Account. Interest and other income on amounts deposited in the Escrow Account
shall be added to the amounts so deposited and held in the Escrow Account.

       4. The Escrow Funds to be held in the Escrow Account, and any interest or
other income earned thereon, shall be subject to, and distributed in accordance
with, the following provisions:

              (a) The Escrow Agent shall hold the Escrow Funds until the earlier
of (i) the date on which it receives a letter signed by each of the Investors
and the Company to the effect that the Company has achieved positive monthly
EBITDA in accordance with generally accepted accounting principles, which letter
shall be accompanied by an executive officer's certificate from the Company that
it has achieved this criteria, (ii) March 31, 2005 or the date on which the
Investors and the Company elect to terminate this Agreement, or (iii) the date
on which it receives a letter signed by each of the Investors and the Company
that a Liquidation Event has occurred. For purposes of this Agreement, the term
"Liquidation Event" shall mean any liquidation, dissolution or winding up of the
Company, whether voluntary or involuntary. Upon the happening of Escrow Agent's
receipt of the letter described in Section 4(a)(i), the Escrow Agent shall
release the Escrowed Funds, plus interest earned in the Escrow Account, to the
Company. Upon the happening of either of the events described in Sections
4(a)(ii) or 4(a)(iii), the Escrow Agent shall release the Escrowed Funds, plus
interest earned in the Escrow Account, to the Investors (on a pro rata basis as
set forth on Exhibit A).

              (a) The Escrow Funds distributed by the Escrow Agent to the
Investors pursuant to this Agreement shall no longer be subject to the terms and
conditions of this Escrow Agreement and shall (so far as this Agreement is
concerned) be and become the sole property of the party receiving the same, free
and clear of all liens and encumbrances.

       5. To induce the Escrow Agent to act hereunder, the Company and the
Investors agree that:

              (a) Distribution of the Escrow Account pursuant to Section 4 of
this Agreement by the Escrow Agent shall operate to divest all right, title,
interest, claim, and demand, either at law or in equity, of any party to this
Agreement (other than the distributee) in and to the Escrow Account and shall be
a perpetual bar both at law and in equity as against the Escrow Agent and
against any person claiming or attempting to claim such distributed Escrow
Account from, through, or under the Escrow Agent.

              (b) The Escrow Agent shall not be under any duty to give the
monies held by it hereunder any greater degree of care than it gives its own
similar property and shall not be required to invest any funds held hereunder
except as directed in this Escrow Agreement. Uninvested funds held hereunder
shall not earn or accrue interest.

              (c) This Escrow Agreement expressly sets forth all the duties of
the Escrow Agent with respect to any and all matters pertinent hereto. No
implied duties or obligations shall be read into this Agreement against the
Escrow Agent. The Escrow Agent shall not be bound by the provisions of any
agreement except this Escrow Agreement.

<PAGE>

              (d) The Escrow Agent shall not be liable, except for its own gross
negligence or willful misconduct and, except with respect to claims based upon
such gross negligence or willful misconduct that are successfully asserted
against the Escrow Agent, the Company and the Investors shall, jointly and
severally, indemnify and hold harmless the Escrow Agent (and any successor
Escrow Agent) from and against any and all losses, deficiencies, liabilities,
claims, suits, actions, damages, settlements and expenses, including reasonable
attorneys fees and disbursements, arising out of and in connection with this
Escrow Agreement. Without limiting the foregoing, the Escrow Agent shall in no
event be liable in connection with its investment or reinvestment of any cash
held by it hereunder in good faith, in accordance with the terms hereof,
including, without limitation, any liability for any delays (not resulting from
it gross negligence or willful misconduct) in the investment or reinvestment of
any Escrow Funds, or any loss of interest incident to any such delays.

              (e) The Escrow Agent shall be entitled to rely upon any order,
judgment, certification, demand, notice, instrument or other writing delivered
to it hereunder without being required to determine the authenticity or the
correctness of any fact stated therein or the propriety or validity or the
service thereof. The Escrow Agent may act in reliance upon any instrument or
signature believed by it to be genuine and may assume that any person purporting
to give receipt or advice or make any statement or execute any document in
connection with the provisions hereof has been duly authorized to do so.

              (f) The Escrow Agent may act pursuant to the advice of counsel
with respect to any matter relating to this Escrow Agreement and shall not be
liable for any action taken or omitted in accordance with such advice.

              (g) The Escrow Agent does not have any interest in the amounts
deposited hereunder but is serving as escrow holder only and having only
possession thereof. The Company shall pay or reimburse the Escrow Agent upon
request for any transfer taxes or other taxes relating to the escrowed property
incurred in connection herewith and shall indemnify and hold harmless the Escrow
Agent from any amounts that it is obligated to pay in the way of such taxes. Any
payments of income from this Escrow Account shall be subject to withholding
regulations then in force with respect to United States taxes. The parties
hereto will provide the escrow agent with appropriate W-9 forms for tax I.D.,
number certifications, or W-8 forms for non-resident alien certifications. It is
understood that the Escrow Agent shall be responsible for income reporting only
with respect to income earned on investment of funds deposited in the Escrow
Account and is not responsible for any other reporting. This Section 5(g) and
Section 5(d) shall survive notwithstanding any termination of this Escrow
Agreement or the resignation of the Escrow Agent.

              (h) The Escrow Agent shall have no duties or responsibilities
except those expressly set forth herein. The Escrow Agent shall not be bound by
any notice of a claim, or demand with respect thereto, or any waiver,
modification, amendment, termination, cancellation, or revision of this
Agreement, unless in writing and signed by the other parties hereto and received
by the Escrow Agent, and, if the Escrow Agent's duties as escrow agent hereunder
are affected, unless the Escrow Agent shall have given its prior written consent
thereto. The Escrow Agent shall not be bound by any assignment by the Company or
the Investors of any rights hereunder unless the Escrow Agent shall have
received written notice thereof from the assignor.

<PAGE>

The Escrow Agent is authorized to comply with and obey laws, orders, judgments,
decrees, and regulations of any governmental authority, court, tribunal, or
arbitrator. If the Escrow Agent complies with any such law, order, judgment,
decree, or regulation, the Escrow Agent shall not be liable to any of the
parties hereto or to any other person even if such law, order, judgment, decree,
or regulation is subsequently reversed, modified, annulled, set aside, vacated,
found to have been entered without jurisdiction, or found to be in violation of
or beyond the scope of a constitution or a law.

              (i) If the Escrow Agent (i) shall be uncertain as to the Escrow
Agent's duties or rights hereunder, (ii) shall receive any notice, advice,
direction, or other document from any other party with respect to the Escrow
Account which, in the Escrow Agent's opinion, is in conflict with any of the
provisions of this Agreement, or with any notice, advice, direction or other
document it has received from another party, or (iii) should be advised that a
dispute has arisen with respect to the payment, ownership, or right of
possession of the Escrow Account or any part thereof (or as to the delivery,
non-delivery, or content of any notice, advice, direction, or other document),
the Escrow Agent shall be entitled, without liability to anyone, to refrain from
taking any action other than to use the Escrow Agent's best efforts to keep
safely the Escrow Account until the Escrow Agent shall be directed otherwise in
writing by the Company and the Investors or by an order, decree, or judgment of
a court of competent jurisdiction which has been finally affirmed on appeal or
which by lapse of time or otherwise is no longer subject to appeal, but the
Escrow Agent shall be under no duty to institute or to defend any proceeding,
although the Escrow Agent may, in the Escrow Agent's discretion and at the
expense of the Company and the Investors as provided in Section 5(o), institute
or defend such proceedings.

              (j) The Escrow Agent makes no representation as to the validity,
value, genuineness or the collectability of any security or other document or
instrument held by or delivered to it.

              (k) The Company and the Investors authorize the Escrow Agent, if
threatened with litigation or sued, to interplead all interested parties in any
court of competent jurisdiction and to deposit the Escrow Account with the clerk
of that court.

              (l) The Escrow Agent shall not be called upon to advise any party
as to the wisdom in selling or retaining or taking or refraining from any action
with respect to any securities or other property deposited hereunder.

              (m) The Escrow Agent (and any successor Escrow Agent) may at any
time resign as such by delivering the total of the Escrow Funds received by the
Escrow Agent and all interest and other income earned thereon to any successor
Escrow Agent designated by the Escrow Agent, in writing, or to any court of
competent jurisdiction, whereupon the Escrow Agent shall be discharged of and
from any and all further obligations arising in connection with this Escrow
Agreement. The resignation of the Escrow Agent will take effect on the earlier
of (i) the appointment of a successor (including a court of competent
jurisdiction), or (ii) the day which is ten (10) days after the date of delivery
of its written notice of resignation to the Company and the Investors. If at
that time the Escrow Agent has not designated a successor Escrow Agent, the
Escrow Agent's sole responsibility after that time shall be to safekeep the
Escrow Funds received

<PAGE>

by the Escrow Agent and all interest and other income earned thereon until
receipt of a designation of successor Escrow Agent or a final order of a court
of competent jurisdiction.

              (n) The Escrow Agent shall have no responsibility for the contents

f any writing of the arbitrators or any third party contemplated herein as a
means to resolve disputes and may rely without any liability upon the contents
thereof.

              (o) The Company agrees to pay the Escrow Agent $2,500 for its
services hereunder and to reimburse the Escrow Agent for all reasonable
expenses, disbursements and advances incurred or made by the Escrow Agent in
performance of its duties hereunder (including reasonable fees, expenses and
disbursements of its counsel).

              (p) Each party hereby irrevocably submits to the jurisdiction of
any New York State or federal court sitting in New York City in any action or
proceeding arising out of or relating to this Escrow Agreement, and hereby
irrevocably agrees that all claims in respect of such action or proceeding shall
be heard and determined in such a New York State or federal court. Each party
hereby consents to and grants to any such court jurisdiction over such party and
over the subject matter of any such dispute and agrees that delivery or mailing
of any process or other papers in the manner provided herein, or in such manner
as may be permitted by law, shall be valid and sufficient service thereof.

              (q) No printed or other matter in any language (including, without
limitation, prospectuses, notices, reports and promotional material) which
mentions the Escrow Agent's name or the rights, powers, or duties of the Escrow
Agent shall be issued by the Company or any Investor unless the Escrow Agent
shall first have given its specific written consent thereto.

              (r) The Company and the Investors authorize the Escrow Agent, for
any securities held hereunder, if any, to use the services of any United States
central securities depository it deems appropriate, including, but not limited
to, the Depositary Trust Company and the Federal Reserve Book Entry System.

              (s) The Escrow Agent's responsibilities and liabilities hereunder,
except as a result of the Escrow Agent's own bad faith or gross negligence, will
terminate upon the delivery by the Escrow Agent of the Escrow Funds under any
provision of this Agreement.

       6. This Agreement shall be binding upon and inure solely to the benefit
of the parties hereto and their respective successors and assigns, and shall not
be enforceable by or inure to the benefit of any third party except as provided
in Section 5(m) with respect to a resignation by the Escrow Agent. No party may
assign any of its rights or obligations under this Agreement without the written
consent of the other party.

       7. This Agreement may only be modified by a writing signed by the parties
hereto, and no waiver hereunder shall be effective unless in a writing signed by
the party to be charged.

       8. This Agreement shall be construed in accordance with the laws of the
State of New York, without regard to its rules respecting conflicts of laws. It
may be executed in several counterparts, each of which shall be deemed an
original, and all of which shall constitute but one instrument.
<PAGE>

       9. Any notice, consent or request to be given in connection with any of
the terms or provisions of this Agreement shall be in writing and shall be sent
by certified mail, return receipt requested, or delivered against written
receipt:

                 (a) if to the Escrow Agent, to:

                          American Stock Transfer and Trust Company
                          59 Maiden Lane
                          New York, NY 10038
                          Attention: ___________
                          Telephone:     _____________
                          Facsimile:     _____________

                 (b) if to the Company, to:

                          Summus, Inc. (USA)
                          434 Fayetteville Street
                          Suite 600
                          Raleigh, N.C. 27601

                          Attention: Gary E. Ban, Chief Executive Officer
                          Telephone:     (919) 807-5611
                          Facsimile:     (919) 807-5601

Any notice, consent or request given by certified mail shall be deemed given at
the time of certification thereof.

10. This Agreement shall terminate upon the date on which all Escrow Funds and
interest or other income earned thereof has been fully disbursed from the Escrow
Account in accordance with Section 4 of this Agreement.

(a) [Signature Page Follows]

<PAGE>

         IN WITNESS WHEREOF, the parties have duly executed this Escrow
Agreement as of the date first above written.

                                    SUMMUS, INC. (USA)

                                    By:________________________________________
                                         Gary E. Ban
                                         Chief Executive Officer

                                    AMERICAN STOCK TRANSFER AND TRUST COMPANY

                                    By:________________________________________
                                         Name:
                                         Title:

                                    JDS CAPITAL, L.P.

                                    By:________________________________________
                                         Name:
                                         Title:

                                    EMPIRE CAPITAL PARTNERS, LP

                                    By:________________________________________
                                         Name:
                                         Title:

<PAGE>

                                    THE FOCUS FUND, L.P.

                                    By:_______________________________________
                                         Name:
                                                Title:

                                    JOHN A. WILLIAMS

                                    _____________________________________

                                    DONALD D. HAMMETT

                                    _____________________________________

                                    RODNEY D. BABER, JR.

                                    _____________________________________

<PAGE>

                                    EXHIBIT A

                                       TO

                                ESCROW AGREEMENT

                             Dated as of May 3, 2004

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

         NAME OF INVESTOR            AMOUNT OF ESCROW FUNDS

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

JDS Capital, L.P.                           $_______

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

Empire Capital Partners, LP                 $______

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

The Focus Fund, L.P.                        $_______

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

Donald D. Hammett                          $________

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

John A. Williams                           $________

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

Rodney D Baber, Jr.                         $_______

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

TOTALS:                                    $1,000,000

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

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