VASCO DATA SECURITY INTERNATIONAL INC
S-3/A, 2000-11-14
COMPUTER INTEGRATED SYSTEMS DESIGN
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   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 10, 2000
                                                      REGISTRATION NO. 333-46256
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                           --------------------------
                         PRE-EFFECTIVE AMENDMENT NO. 1
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                           --------------------------

                    VASCO DATA SECURITY INTERNATIONAL, INC.
             (Exact name of registrant as specified in its charter)


         DELAWARE                                         36-416320
(State or other jurisdiction                           (I.R.S. Employer
    of incorporation or                               Identification No.)
       organization)
                         ------------------------------

                       1901 SOUTH MEYERS ROAD, SUITE 210
                        OAKBROOK TERRACE, ILLINOIS 60181
                                 (630) 932-8844
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)
                         ------------------------------

                               MARIO R. HOUTHOOFT
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                    VASCO DATA SECURITY INTERNATIONAL, INC.
                       1901 SOUTH MEYERS ROAD, SUITE 210
                        OAKBROOK TERRACE, ILLINOIS 60181
                                 (630) 932-8844
           (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                         ------------------------------
                                   COPIES TO:
                             ROBERT B. MURPHY, ESQ.
                        PIPER MARBURY RUDNICK & WOLFE LLP
                          1200 NINETEENTH STREET, N.W.
                              WASHINGTON, DC 20036
                                  (202)861-3900

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

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As soon as
practicable after the effective date of this Registration Statement.

    If the only  securities  being  registered  on this Form are  being  offered

<PAGE>

pursuant to dividend or interest  reinvestment plans, please check the following
box. / /

    If any of the securities  being registered on this Form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. /X/

    If this Form is filed to  register  additional  securities  for an  offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. / /

    If this Form is a post  effective  amendment  filed  pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. /X/  333-35563

    If delivery of the  prospectus  is expected to be made pursuant to Rule 434,
please check the following box. / /

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

                    CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------
Title of each              Amount           Proposed        Proposed        Amount of
Class of                   to be            maximum         maximum         registration
Securities to              registered*      offering        price           aggregate fee
Be registered                               per share**     offering
price
-----------------------------------------------------------------------------------------
<S>                        <C>              <C>             <C>             <C>
Common stock, par          6,817,428        $10.93****      $74,565,618     $19,685.32
value $0.001 per share
-----------------------------------------------------------------------------------------
</TABLE>

*    Pursuant to Rule 429 under the Securities Act, the prospectus  contained in
     this  Registration  Statement is a combined  prospectus and also relates to
     (i) up to  6,418,595  options to purchase  common stock and up to 6,418,595
     shares of common  stock  underlying  such  options and (ii) up to 1,056,922
     warrants  to purchase  common  stock and up to  1,056,922  shares of common
     stock  underlying  such  warrants,  which  options,  warrants and shares of
     common stock were registered  under  Registration  Statement No.  333-35563
     previously filed with the SEC on Form S-4 and declared effective, and which
     Registration   Statement,   pursuant  to  Rule  416,   also   covered  such
     indeterminate  number of shares of common stock as may be issuable upon the
     exercise  of  the  options  and/or  warrants   pursuant  to   anti-dilution
     provisions thereof. This Registration Statement constitutes  post-effective
     Amendment  No.  4 to  Registration  Statement  No.  333-35563,  which  post
     -effective amendment shall hereafter become effective concurrently with the
     effectiveness of this Registration Statement and in accordance with Section
     8(c) of the Securities Act. This Registration  Statement covers the maximum
     number  of shares of common  stock  issuable  pursuant  to the terms of the
     conversion of shares of Series C Preferred Stock. Upon the effectiveness of


                                       2
<PAGE>

     such  post-effective  amendment  and  this  Registration  Statement,   this
     Registration  Statement will relate to an aggregate of 6,418,595 options to
     purchase common stock, 1,056,922 warrants to acquire shares of common stock
     and  14,292,945  shares of common  stock.  The filing fee  associated  with
     6,418,595  options,  1,056,922  warrants and the 7,475,517 shares of common
     stock underlying such options and warrants under Registration No. 333-35563
     was paid at the time of filing of that Registration Statement.

**   Includes  1,239,474  shares of common stock  issuable  upon the exercise of
     warrants.  Pursuant to Rule 416, this  Registration  Statement  also covers
     such indeterminate number of shares of common stock as may be issuable upon
     the exercise of such warrants pursuant to anti-dilution provisions thereof.

***  Estimated  solely  for the  purpose of  calculating  the  registration  fee
     pursuant to Rule 457(g).

**** Estimated  under Rule  457(c)  solely for the  purpose of  calculating  the
     registration  fee,  using  the  aggregate  of the  high and low  prices  as
     reported on the Nasdaq National Market on November 8, 2000.

--------------------------------------------------------------------------------
THE REGISTRANT HEREBY AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT  SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY  STATES THAT THIS REGISTRATION  STATEMENT
SHALL  THEREAFTER  BECOME  EFFECTIVE  IN  ACCORDANCE  WITH  SECTION  8(A) OF THE
SECURITIES  ACT OF  1933  OR  UNTIL  THE  REGISTRATION  STATEMENT  SHALL  BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION,  ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.

================================================================================


                                       3
<PAGE>

THE  INFORMATION IN THIS  PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED.  WE MAY
NOT SELL  THESE  SECURITIES  UNTIL THE  REGISTRATION  STATEMENT  FILED  WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL  THESE  SECURITIES  AND IS NOT AN OFFER TO BUY THESE  SECURITIES  IN ANY
STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

PROSPECTUS

                 SUBJECT TO COMPLETION, DATED NOVEMBER 10, 2000

                                     [LOGO]
                     VASCO DATA SECURITY INTERNATIONAL, INC.


                                  COMMON STOCK,
                        WARRANTS TO PURCHASE COMMON STOCK
                                       AND
                        COMMON STOCK UNDERLYING WARRANTS

     This prospectus  relates to the public offering by selling  securityholders
from time to time of up to 14,292,945 shares of common stock, 1,056,922 warrants
to purchase common stock and 6,418,595 options to purchase common stock. We will
not receive any of the proceeds from the sale of these  securities.  The selling
securityholders listed on page ___ may offer, from time to time, those shares of
our common stock and warrants under this prospectus. The selling securityholders
may offer and sell  their  shares of common  stock and  warrants  to or  through
broker-dealers,   who  may  receive  compensation  in  the  form  of  discounts,
concessions or commissions from the selling  securityholders,  the purchasers of
the securities, or both.

     Our common stock is traded on the Nasdaq  National  Market under the symbol
"VDSI." On November __, 2000, the closing price of one share of our common stock
was $_____.  Our common  stock is also traded on the EASDAQ  exchange  under the
same trading symbol. The closing price on EASDAQ was _____ on November __, 2000.

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

    INVESTING  IN OUR  COMMON  STOCK AND  WARRANTS  INVOLVES  RISKS.  YOU SHOULD
CAREFULLY  READ AND  CONSIDER  THE "RISK  FACTORS"  SECTION  OF THIS  PROSPECTUS
BEGINNING ON PAGE __ BEFORE YOU MAKE YOUR INVESTMENT DECISION.

    NEITHER THE  SECURITIES  AND EXCHANGE  COMMISSION  NOR ANY STATE  SECURITIES
COMMISSION HAS APPROVED OR  DISAPPROVED  OF THESE  SECURITIES OR PASSED UPON THE
ADEQUACY OR ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

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

                 The date of this prospectus is November __, 2000


                                       4
<PAGE>

                               TABLE OF CONTENTS

                                                                          PAGE
                                                                        --------
Forward Looking Statements ............................................     5
Summary................................................................     6
Use of Proceeds........................................................     6
Risk Factors...........................................................     7
Selling Securityholders................................................    17
Plan of Distribution...................................................    20
Legal Matters..........................................................    22
Experts................................................................    22
Where You Can Find More Information....................................    22
Incorporation by Reference.............................................    23


    VASCO and VACMAN are registered trademarks in the United States. In addition
we have applied for registration of the Digipass  trademark in the United States
and VACMAN Optimum in the Benelux countries.

                          FORWARD LOOKING STATEMENTS

    Many  statements  made in this  prospectus  under the  captions  "Prospectus
Summary," "Risk Factors," and elsewhere are forward-looking  statements that are
not based on historical  facts.  These  forward-looking  statements  are usually
accompanied  by words such as  "believes,"  "anticipates,"  "plans,"  "intends,"
"expects"  and similar  expressions.  Because these  forward-looking  statements
involve risks and  uncertainties,  there are important  factors that could cause
actual  results to differ  materially  from those  expressed or implied by these
forward-looking statements, including those discussed under "Risk Factors."


                                       5
<PAGE>

                                    SUMMARY

     THIS SUMMARY  HIGHLIGHTS  INFORMATION  ABOUT OUR COMPANY  BECAUSE THIS IS A
SUMMARY,  IT MAY NOT  CONTAIN ALL THE  INFORMATION  YOU SHOULD  CONSIDER  BEFORE
INVESTING  IN OUR  COMMON  STOCK  OR  WARRANTS.  YOU  SHOULD  READ  THIS  ENTIRE
PROSPECTUS CAREFULLY.


                                  OUR COMPANY

    We design,  develop, market and support security products and services which
manage and protect against  unauthorized access to computer systems of corporate
and government customers.  Additionally, we enable secure financial transactions
made over private enterprise networks and public networks, such as the Internet.
We believe that our software and hardware  products provide  organizations  with
strong,  flexible and effective  Internet and enterprise  security solutions and
they compete favorably against those of our competitors.

     Our  IdentiSoft  group  primarily  designs and markets  products  under the
Digipass brand.  Our Digipass  product line provides  greater  flexibility and a
more affordable  means than competing  products of  authenticating  users to any
network,  including the  Internet.  The Digipass  family of user  authentication
devices,  all of which incorporate an electronic digital signature capability to
guarantee the integrity of electronic  transactions and data transmissions,  are
commonly referred to as security tokens.

     Our IntelliSoft  group includes our SnareWorks and VACMAN software  product
lines. Our SnareWorks  product provides the security bridge between the existing
software  infrastructure of legacy mainframe and client-server  applications and
the  world of the Web,  including  e-commerce  and  business-to-business  on the
Internet.

     Our  principal  executive  offices are located at 1901 South  Meyers  Road,
Suite 210,  Oakbrook  Terrace,  Illinois 60181 and the telephone  number at that
address is (630)  932-8844.  Our  principal  offices  in Europe  are  located at
Koningin  Astridlaan 164, B-1780 Wemmel Belgium and the telephone number at that
address  is  32(0)2/456.98.10.  We  maintain  a website  at  www.vasco.com.  The
information  contained  on our  Web  site  does  not  constitute  part  of  this
prospectus.

                                USE OF PROCEEDS

    All of the common stock and warrants  offered by this  prospectus  are being
offered by our selling securityholders.  We will not receive any of the proceeds
from any sale.


                                       6
<PAGE>

                                   RISK FACTORS

    YOU SHOULD CONSIDER  CAREFULLY THE RISKS AND  UNCERTAINTIES  DESCRIBED BELOW
BEFORE MAKING AN INVESTMENT DECISION. ANY OF THE FOLLOWING RISKS COULD ADVERSELY
AFFECT OUR BUSINESS,  OUR COMPETITIVE  POSITION AND FINANCIAL  RESULTS.  IN THAT
CASE, THE TRADING PRICE OF OUR COMMON STOCK COULD DECLINE AND YOU COULD LOSE ALL
OR PART OF YOUR INVESTMENT.


WE HAVE A HISTORY OF OPERATING LOSSES AND A LARGE ACCUMULATED DEFICIT AND WE MAY
   NEVER ACHIEVE OR SUSTAIN PROFITABILITY.

    We may never be able to  achieve or  sustain  profitability  on an annual or
quarterly basis in the future. We have incurred  operating losses of $4,167,622,
$1,326,655  and $892,957 for the years ended  December 31, 1997,  1998 and 1999,
respectively,  and we  expect  to incur  operating  losses  for the  foreseeable
future.

WE FACE SIGNIFICANT  COMPETITION AND IF WE LOSE OR FAIL TO GAIN MARKET SHARE OUR
   FINANCIAL RESULTS WILL SUFFER.

    The market for computer and network security products is highly competitive.
Our competitors include organizations that provide computer and network security
products  based upon  approaches  similar to and  different  from those which we
employ such as AXENT Technologies,  Inc., RSA Security Inc. and Netegrity,  Inc.
Many  of  our  competitors  have  significantly  greater  financial,  marketing,
technical and other competitive  resources than we do. As a result,  they may be
able to adapt  more  quickly  to new or  emerging  technologies  and  changes in
customer requirements,  or to devote greater resources to the promotion and sale
of their products.


TECHNOLOGICAL  CHANGES OCCUR RAPIDLY IN OUR INDUSTRY AND OUR  DEVELOPMENT OF NEW
   PRODUCTS IS CRITICAL TO MAINTAIN OUR REVENUES.

    The  introduction by our competitors of products  embodying new technologies
and the emergence of new industry  standards could render our existing  products
obsolete and  unmarketable.  Our future revenue growth and operating profit will
depend in part upon our  ability to enhance  our  current  products  and develop
innovative  products to distinguish  ourselves from the  competition and to meet
customers'  changing needs in the data security  industry.  We cannot assure you
that security-related  product developments and technology innovations by others
will not adversely  affect our  competitive  position or that we will be able to
successfully  anticipate or adapt to changing technology,  industry standards or
customer requirements on a timely basis.


THE SALES  CYCLE  FOR OUR  PRODUCTS  AND  TECHNOLOGY  IS LONG,  AND WE MAY INCUR

                                       7
<PAGE>

  SUBSTANTIAL EXPENSES FOR SALES THAT DO NOT OCCUR WHEN ANTICIPATED.

    The sales cycle for our  products,  which is the period of time  between the
identification of a potential  customer and completion of the sale, is typically
lengthy and subject to a number of  significant  risks over which we have little
control.  If revenue falls  significantly below anticipated levels, our business
would be seriously harmed.

    A typical sales cycle is often three to six months. Purchasing decisions for
our products  and systems may be subject to delay due to many factors  which are
not within our control, such as:

    -   the time required for a  prospective  customer to recognize the need for
        our products;

    -   the  significant  expense of many data  security  products  and  network
        systems;

    -   customers' internal budgeting processes; and

    -   internal  procedures  customers  may require  for the  approval of large
        purchases.


WE HAVE A  SIGNIFICANT  DEPENDENCE  ON MAJOR  CUSTOMERS  AND LOSING ANY OF THESE
   CUSTOMERS COULD RESULT IN A SIGNIFICANT LOSS IN REVENUES.

    If we don't find other customers who generate  significant  future revenues,
the unforeseen loss of one or more of our major  customers,  or the inability to
maintain  reasonable  profit margins on sales to any of these  customers,  would
have a material  adverse  effect on our  results  of  operations  and  financial
condition.


OUR SUCCESS DEPENDS ON ESTABLISHING AND MAINTAINING STRATEGIC RELATIONSHIPS WITH
  OTHER COMPANIES TO DEVELOP,  MARKET AND DISTRIBUTE OUR TECHNOLOGY AND PRODUCTS
  AND, IN SOME CASES, TO INCORPORATE OUR TECHNOLOGY INTO THEIR PRODUCTS.

    Part of our business strategy is to enter into strategic alliances and other
cooperative  arrangements with other companies in our industry. We currently are
involved in cooperative  efforts with respect to  incorporation  of our products
into products of others, research and development efforts, marketing efforts and
reseller  arrangements.  None of these relationships are exclusive,  and some of
our strategic  partners also have cooperative  relationships with certain of our
competitors. If we are unable to enter cooperative arrangements in the future or
if we lose  any of our  current  strategic  or  cooperative  relationships,  our
business  could be harmed.  We do not control the time and resources  devoted to
such activities by parties with whom we have relationships.  In addition, we may


                                       8
<PAGE>

not have the resources available to satisfy our commitments, which may adversely
affect these  relationships.  These  relationships may not continue,  may not be
commercially   successful,   or  may  require  our  expenditure  of  significant
financial,  personnel and administrative  resources from time to time.  Further,
certain of our products  and services  compete with the products and services of
our strategic partners.

WE MAY NEED  ADDITIONAL  CAPITAL IN THE FUTURE AND OUR FAILURE TO OBTAIN CAPITAL
   WOULD INTERFERE WITH OUR GROWTH STRATEGY.

     Subsequent  to June 30,  2000,  we issued  preferred  stock and warrants to
purchase common stock resulting in $15.0 million in cash. At September 30, 2000,
we had $____  million in cash and $____ million in working  capital.  We believe
that our current cash balances  together with cash  generated  from  operations,
will be  sufficient  to fund our  anticipated  working  capital  needs,  capital
expenditures and any potential future  acquisitions for at least 12 months.  Our
current  cash  balances  are  kept  in  short-term,  investment-grade,  interest
-bearing  securities  pending  their use. In the event our plans or  assumptions
change or prove to be inaccurate, or if we consummate any unplanned acquisitions
of  businesses  or assets,  we may be  required  to seek  additional  sources of
capital. Sources of additional capital may include public and private equity and
debt financings,  sales of nonstrategic assets and other financing arrangements.
There can be no assurance that we will have access to such capital.

    Our  ability  to  obtain  financing  will  depend  on a number  of  factors,
including market  conditions,  our operating  performance and investor interest.
These factors may make the timing, amount, terms and conditions of any financing
unattractive.  They may also result in our incurring additional  indebtedness or
accepting  stockholder  dilution. If adequate funds are not available or are not
available on acceptable  terms, we may have to forego strategic  acquisitions or
investments, defer our product development activities, or delay the introduction
of new products.

WE DEPEND ON THE SERVICES OF OUR KEY PERSONNEL,  ESPECIALLY  MARIO R. HOUTHOOFT,
   OUR CHIEF  EXECUTIVE  OFFICER,  AND THE LOSS OF HIS SERVICES WOULD  INTERFERE
   WITH THE EXECUTION OF OUR STRATEGY.

    The  execution  of our  strategy  depends  in  large  part on the  continued
services  of our  key  personnel,  especially  Mario  R.  Houthooft,  our  chief
executive  officer.  Failure to execute our  strategy  would result in a loss of
marketshare to our competition and would result in lower operating results.

OUR FAILURE TO ATTRACT AND RETAIN  HIGHLY  SKILLED  TECHNICAL  PERSONNEL FOR OUR
  RESEARCH AND DEVELOPMENT  DEPARTMENT  WOULD RESULT IN DELAYED  INTRODUCTION OF
  NEW OR MODIFIED  PRODUCTS,  LOSS OF CLIENTS AND MARKET SHARE AND  REDUCTION IN
  REVENUES.


                                       9
<PAGE>

    The market for highly skilled technicians in Europe and the United States is
highly  competitive.  If we  fail  to  attract,  train,  assimilate  and  retain
qualified  technical personnel for our research and development  department,  we
will experience  delays in  introductions of new or modified  products,  loss of
clients and market share and a reduction in revenues.

WE ARE  EXPERIENCING  SIGNIFICANT  GROWTH  WHICH  MAY  PLACE  A  STRAIN  ON  OUR
   RESOURCES.

    We are  experiencing a period of significant  growth that has been placing a
significant strain on all of our resources. To manage future growth effectively,
we must enhance our  financial  and  accounting  systems and  controls,  further
develop our management  information systems,  integrate new personnel and manage
expanded  operations.  Our failure to manage our growth effectively could have a
material adverse effect on the quality of our products and services, our ability
to retain key  personnel  and our  business,  operating  results  and  financial
condition.


WE FACE A NUMBER RISKS ASSOCIATED WITH INTERNATIONAL  OPERATIONS,  ANY OR ALL OF
   WHICH COULD  RESULT IN A  DISRUPTION  IN OUR  BUSINESS  AND A DECREASE IN OUR
   REVENUES.

    Our business  internationally  is subject to a number of risks any or all of
which  could  result in a  disruption  in our  business  and a  decrease  in our
revenues. These include:

    -   inconsistent   regulations   and   unexpected   changes  in   regulatory
        requirements;

    -   difficulties   and  costs  of  staffing   and   managing   international
        operations;

    -   potentially adverse tax consequences;

    -   wage and price controls;

    -   uncertain protection for intellectual property rights;

    -   imposition of trade barriers;

    -   differing technology standards;

    -   uncertain demand for electronic commerce;

    -   linguistic and cultural differences;

    -   political instability; and

    -   social unrest.


                                       10
<PAGE>

WE ARE SUBJECT TO FOREIGN EXCHANGE RISKS,  AND IMPROPER  MANAGEMENT OF THAT RISK
   COULD RESULT IN LARGE CASH LOSSES.

    Because a significant number of our principal  customers are located outside
the United States, we expect that international  sales will continue to generate
a significant portion of our total revenue.

    We are subject to foreign  exchange  risks because the majority of our costs
and expenses are denominated in U.S. dollars,  whereas a significant  portion of
the sales of our European  operating  subsidiaries  are  denominated  in various
foreign  currencies.  A decrease in the value of any of these foreign currencies
relative to the U.S. dollar could affect the  profitability  in U.S.  dollars of
our products sold in these markets. We do not hold forward exchange contracts or
other hedging  instruments to exchange  foreign  currencies for U.S.  dollars to
offset currency rate fluctuations which might affect our obligations in relation
to our repayment from operations out of income from sales (which are principally
in foreign  currency) of debt under our loan obligations  (which are principally
in U.S. dollars).

WE HAVE A GREAT  DEPENDENCE  ON A LIMITED  NUMBER OF  SUPPLIERS  AND THE LOSS OF
   THEIR MANUFACTURING CAPABILITY COULD MATERIALLY IMPACT OUR OPERATIONS.

    In the  event  that  the  supply  of  components  or  finished  products  is
interrupted  or relations  with either of our principal  vendors is  terminated,
there could be a considerable delay in finding suitable  replacement  sources to
manufacture  our  products  at the  same  cost or at all.  The  majority  of our
products are manufactured by two independent vendors headquartered in Hong Kong.
Each vendor  assembles our security tokens at facilities in mainland China.  The
importation  of these  products  from  China  exposes us to the  possibility  of
product  supply  disruption  and increased  costs in the event of changes in the
policies  of the  Chinese  government,  political  unrest or  unstable  economic
conditions  in China or  developments  in the United  States that are adverse to
trade, including enactment of protectionist legislation.

WE DEPEND  SIGNIFICANTLY  UPON  OUR  PROPRIETARY   TECHNOLOGY  AND  INTELLECTUAL
   PROPERTY AND THE FAILURE TO PROTECT OUR  PROPRIETARY  RIGHTS COULD REQUIRE US
   TO REDESIGN  OUR  PRODUCTS OR REQUIRE US TO ENTER INTO  ROYALTY OR  LICENSING
   AGREEMENTS,  ANY OF WHICH COULD REDUCE  REVENUE AND  INCREASE  OUR  OPERATING
   COSTS.

    We currently rely on a combination of patent,  copyright and trademark laws,
trade secrets,  confidentiality agreements and contractual provisions to protect
our proprietary rights. We seek to protect our software, documentation and other
written  materials  under trade  secret and  copyright  laws,  which afford only
limited protection,  and generally enter into  confidentiality and nondisclosure
agreements with our employees and with key vendors and suppliers.


                                       11
<PAGE>

    There has been substantial  litigation in the technology  industry regarding
intellectual  property  rights,  and we may  have to  litigate  to  protect  our
proprietary technology. We expect that companies in the computer and information
security  market  will  increasingly  be subject to  infringement  claims as the
number of products and competitors increases.  Any such claims or litigation may
be  time-consuming  and costly,  cause product  shipment  delays,  require us to
redesign  our  products  or  require  us to  enter  into  royalty  or  licensing
agreements, any of which could reduce revenue and increase our operating costs.

OUR PATENTS MAY NOT PROVIDE US WITH COMPETITIVE ADVANTAGES.

    We hold several patents in the United States and a  corresponding  patent in
some European  countries,  which cover multiple  aspects of our technology.  The
U.S.  patents  expire  between  2003 and 2010 and the  patent in those  European
countries  expires in 2008.  There can be no assurance  that we will continue to
develop  proprietary  products or  technologies  that are  patentable,  that any
issued  patent will provide us with any  competitive  advantages  or will not be
challenged  by third  parties,  or that  patents  of others  will not hinder our
competitive advantage.

WE ARE SUBJECT TO PRODUCT LIABILITY RISKS.

    A malfunction  of or design defect in our products which results in a breach
of a customer's  data security  could result in tort or warranty  claims against
us. We do not presently maintain product liability  insurance for these types of
claims.

THERE IS  SIGNIFICANT  GOVERNMENT  REGULATION OF  TECHNOLOGY  EXPORTS AND TO THE
  EXTENT WE CANNOT MEET THE REQUIREMENTS OF THE REGULATIONS WE MAY BE PROHIBITED
  FROM  EXPORTING  SOME  OF OUR  PRODUCTS  WHICH  COULD  NEGATIVELY  IMPACT  OUR
  REVENUES.

    Our  international  sales and  operations  are  subject to risks such as the
imposition of government controls,  new or changed export license  requirements,
restrictions  on the  export of  critical  technology,  trade  restrictions  and
changes in tariffs.  If we become unable to obtain foreign regulatory  approvals
on a timely basis our business in those  countries would no longer exist and our
revenues would decrease dramatically.

    Certain of our products are subject to export  controls  under U.S. law. The
list of products and  countries for which export  approval is required,  and the
regulatory  policies  with respect  thereto may be revised from time to time and
our  inability  to obtain  required  approvals  under  these  regulations  could
materially  adversely  affect  our  ability  to make  international  sales.


                                       12
<PAGE>

WE EMPLOY  CRYPTOGRAPHIC  TECHNOLOGY  IN OUR  AUTHENTICATION  PRODUCTS THAT USES
   COMPLEX MATHEMATICAL FORMULATIONS TO ESTABLISH NETWORK SECURITY SYSTEMS.

    Many  of  our  products  are  based  on   cryptographic   technology.   With
cryptographic technology, a user is given a key which is required to encrypt and
decode  messages.  The  security  afforded  by this  technology  depends  on the
integrity of a user's key and in part on the  application of  algorithms,  which
are advanced  mathematical  factoring  equations.  These codes may eventually be
broken or become  subject to government  regulation  regarding  their use, which
would render our technology and products less  effective.  The occurrence of any
one of the following  could result in a decline in demand for our technology and
products:

    -   any  significant  advance  in  techniques  for  attacking  cryptographic
        systems,  including  the  development  of an easy  factoring  method  or
        faster, more powerful computers;

    -   publicity of the successful  decoding of  cryptographic  messages or the
        misappropriation of keys; and

    -   increased  government  regulation limiting the use, scope or strength of
        cryptography.


ANY ACQUISITIONS  WE MAKE COULD  DISRUPT  OUR  BUSINESS  AND HARM OUR  FINANCIAL
   CONDITION.

    We  may  make   investments   in   complementary   companies,   products  or
technologies.  Should  we do so,  our  failure  to  successfully  manage  future
acquisitions  could  seriously harm our operating  results.  In the event of any
future  purchases,  we will face  additional  financial and  operational  risks,
including:

    -   difficulty in assimilating  the operations,  technology and personnel of
        acquired companies;

    -   disruption  in our business  because of the  allocation  of resources to
        consummate   these   transactions  and  the  diversion  of  management's
        attention from our existing business;

    -   difficulty  in retaining key technical  and  managerial  personnel  from
        acquired companies;

    -   dilution  of  our  stockholders,  if  we  issue  equity  to  fund  these
        transactions;

    -   assumption of operating losses, increased expenses and liabilities; and

    -   our  relationships  with  existing  employees,  customers  and  business
        partners   may  be  weakened  or   terminated   as  a  result  of  these
        transactions.


                                       13
<PAGE>

WE EXPERIENCE  VARIATIONS  IN  QUARTERLY  OPERATING  RESULTS  AND ARE SUBJECT TO
   SEASONALITY, BOTH OF WHICH MAY RESULT IN A VOLATILE STOCK PRICE.

    In the future,  as in the past,  our  quarterly  operating  results may vary
significantly  resulting  in a  volatile  stock  price.  Factors  affecting  our
operating results include:

    -   the level of competition;

    -   the size, timing, cancellation or rescheduling of significant orders;

    -   new product announcements or introductions by current competitors;

    -   adoption of new technologies and standards;

    -   changes in pricing by current competitors;

    -   our ability to develop,  introduce  and market new  products and product
        enhancements on a timely basis, if at all;

    -   component costs and availability;

    -   our success in expanding our sales and marketing programs;

    -   foreign currency exchange rates; and

    -   general economic trends.


A SMALL  GROUP OF PERSONS  HAVE  CONTROL OF A  SUBSTANTIAL  AMOUNT OF OUR COMMON
  STOCK AND COULD DELAY OR PREVENT A CHANGE OF CONTROL.

    Our board of directors and their  immediate  families will own  beneficially
and of record  approximately  %, with Mr. T.  Kendall  Hunt and his wife  owning
beneficially  approximately %, of the outstanding shares of common stock. As the
chairman of the board of  directors  and our largest  stockholder,  Mr. Hunt may
exercise  substantial  control over our future  direction and operation and such
concentration  of  control  may have the  effect of  discouraging,  delaying  or
preventing a change in control and may also have an adverse effect on the market
price of our common stock.


OUR STOCK PRICE MAY BE VOLATILE AND YOU MAY NOT BE ABLE TO RESELL YOUR SHARES AT
  OR ABOVE ACCEPTABLE PRICES.

    If an active  public  market for our  common  stock  does not  develop,  the
liquidity of your  investment may be limited,  and our stock price may fluctuate
or decline  below your  expectations.  The market  price of our common stock may
fluctuate  significantly  in response  to factors,  some of which are beyond our


                                       14
<PAGE>

control, including the following:

    -   actual or anticipated fluctuations in our operating results;

    -   changes in market valuations of other technology companies;

    -   announcements  by  us  or  our  competitors  of  significant   technical
        innovations,  contracts,  acquisitions,  strategic  partnerships,  joint
        ventures or capital commitments;

    -   additions or departures of key personnel;

    -   future sales of common stock;

    -   any  deviations  in net  revenues or in losses  from levels  expected by
        securities analysts; and

    -   trading volume fluctuations.

THE PRICE OF OUR COMMON  STOCK MAY  DECLINE  DUE TO SALES OR THE  APPEARANCE  OF
  SALES OF LARGE NUMBERS OF OUR SHARES.

     Sales of  substantial  amounts of our common stock in the public  market or
the  appearance  that a large number of shares is or will be available for sale,
could cause the price for our common stock to decline.

WE HAVE NOT PAID AND DO NOT INTEND TO PAY DIVIDENDS.

    We have not paid any dividends on our common stock,  and we do not intend to
pay cash dividends in the foreseeable future.

CERTAIN  PROVISIONS  OF OUR CHARTER  AND OF DELAWARE  LAW MAKE A TAKEOVER OF OUR
  COMPANY MORE DIFFICULT.

     Our corporate charter and Delaware law contain provisions,  such as a class
of  authorized  but  unissued  preferred  stock which may be issued by our Board
without  stockholder  approval,  that might  enable our  management  to resist a
takeover of our company.  Delaware law also limits  business  combinations  with
interested stockholders.  These provisions might discourage,  delay or prevent a
change in our control or a change in our management. These provisions could also
discourage  proxy  contests,  and  make it  more  difficult  for  you and  other
stockholders to elect directors and take other corporate actions.  The existence
of these provisions could limit the price that investors might be willing to pay
in the future for shares of our common stock.

FUTURE  ISSUANCES  OF BLANK CHECK  PREFERRED  STOCK MAY REDUCE  VOTING  POWER OF


                                       15
<PAGE>

  COMMON STOCK AND MAY HAVE ANTI-TAKEOVER EFFECTS THAT COULD PREVENT A CHANGE IN
  CONTROL.

     Our corporate  charter  authorizes  the issuance of up to 500,000 shares of
preferred stock with such designations, rights, powers and preferences as may be
determined  from time to time by our board of directors.  The board of directors
is empowered,  without  stockholder  approval,  to issue up to 500,000 shares of
preferred  stock with such dividend,  liquidation,  conversion,  voting or other
rights,  powers and  preferences  as may be determined  from time to time by the
Board.  The issuance of preferred stock could adversely  affect the voting power
or other  rights of the holders of common  stock.  In addition,  the  authorized
shares of  preferred  stock and common stock could be  utilized,  under  certain
circumstances,  as a method of discouraging,  delaying or preventing a change in
control.

U.S.  INVESTORS MAY HAVE  DIFFICULTIES  IN MAKING CLAIMS FOR ANY BREACH OF THEIR
  RIGHTS AS HOLDERS OF SHARES  BECAUSE  SOME OF OUR  ASSETS  AND  DIRECTORS  AND
  EXECUTIVES ARE NOT LOCATED IN THE UNITED STATES.

    Several of our directors  and  executives  are  residents of Belgium,  and a
substantial  portion  of our  assets  and  those  of some of our  directors  and
executives  are located in  Belgium.  As a result,  it may not be  possible  for
investors to effect service of process on those persons  outside of Belgium,  or
to enforce judgments against some of our directors and executives based upon the
securities  or other laws of  jurisdictions  other than  Belgium.  Moreover,  we
believe  that  under  Belgian  law  there  exist  certain  restrictions  on  the
enforceability in Belgium in original  actions,  or in actions of enforcement of
judgments  rendered against us in courts outside  jurisdictions that are a party
to the Brussels  Convention on Jurisdiction  and the Enforcement of Judgments in
Civil and  Commercial  Matters (as  amended).  Actions for  enforcement  of such
judgments may be successful  only if the Belgian court confirms the  substantive
correctness of the judgment of such court, and is satisfied:

    -   that the judgment is not contrary to the  principles of public policy in
        Belgium or rules of Belgian public law;

    -   that the judgment did not violate the rights of the defendant;

    -   that the judgment is final under applicable law;

    -   that the court did not  accept its  jurisdiction  solely on the basis of
        the nationality of the plaintiff; and

    -   as to the authenticity of the text of the judgment submitted to it.

    Judgments  rendered in the courts of parties to the Brussels  Convention  on
Jurisdiction  and  Enforcement of Judgments in Civil and Commercial  Matters (as
amended),  will be enforceable by the courts of Belgium without reexamination of
the merits of the case provided  such judgment is final and otherwise  satisfies
all of the conditions provided for in this Convention.  If proceedings have been
brought in one  country,  however,  new  proceedings  in another  country may be
barred.


                                       16
<PAGE>

                            SELLING SECURITYHOLDERS

     The  following  table  sets  forth  information  regarding  the  beneficial
ownership of our common stock held by the selling securityholders, the number of
shares  being  registered  to permit  sales  from  time to time by such  selling
securityholders,  and the total  beneficial  ownership  of shares of our  common
stock if all shares so registered should be sold by the selling securityholders.
This information is as of November __, 2000.  Beneficial ownership is determined
by the rules of the SEC. To our knowledge,  all shares are  beneficially  owned,
and sole  voting and  investment  power is held by the  person or entity  named,
unless otherwise noted.  This information  assumes the sale of all shares listed
under  "Common  Stock to be  Offered."  It also assumes that none of the selling
securityholders  will sell securities which are  beneficially  owned by them and
are not listed in such column or purchase or otherwise acquire additional shares
of our common  stock or  securities  convertible  into or  exchangeable  for our
common stock. The selling  securityholders  also are not under any obligation to
sell  all  or  any  portion  of  their  common   stock,   nor  are  the  selling
securityholders  obligated to sell any of their common stock  immediately  under
this  prospectus.  This  information  may  change  from  time to time,  and,  if
required,  such  information  may be set forth in a supplement of supplements to
this prospectus.

    Unless otherwise set forth below, none of the selling  securityholders  has,
or  within  the past  three  years has had,  any  position,  office or  material
relationship with us or our predecessors.

<TABLE>
<CAPTION>

                                                  COMMON STOCK              COMMON STOCK
NAME AND ADDRESS                                  OWNED PRIOR TO                TO
NUMBER/PERCENT                                    THE OFFERING              BE OFFERED(1)
----------------                                 --------------            --------------
<S>                                                 <C>                      <C>
L&H Investment Company                              1,928,572                1,928,572
St. Krispijnstraat 7
B-8900 Ieper, Belgium

Sofinim N.V.                                          285,714                  285,714
Montoyerstreet 63
B-1000 Brussels, Belgium

Mercator & Noordstar                                  285,714                  285,714
Kortrijksesteenwee
8000 Ghent, Belgium

Trust Capital Technology                              857,143                  857,143
Ter Bede Business  Center
Kapel ter Bede 86
8500 Kortrijk, Belgium

NV Coukinvest                                         142,857                  142,857
Waregemstraat 26
8570 Vichte, Belgium
</TABLE>


                                       17
<PAGE>
<TABLE>
<CAPTION>
<S>                                                 <C>                      <C>
Fortis Bank S.A. N.V.                                  40,000                   40,000
Montagne du Parc 3
B1000 Brussels, Belgium

G. Holdings Ltd.                                      420,637                  420,637
1A Star Plaza
Nassau (NP), Bahamas

Ubizen N.V.                                         2,534,229                2,534,229
Grensstraat 1b
B-3000 Leuven, Belgium

Alexander Fedorov                                       2,471                    2,471
1014 Rockrose Lane
Sunnyvale, CA 94086

Sergei Burkov                                         105,036                  105,036
949 Clinton Road
Los Altos, CA 94024

Ekaterina Sheinin                                       2,471                    2,471
949 Clinton Road
Los Altos, CA 94024

Ilya Shor                                               2,471                    2,471
1026 Hyde Avenue
San Jose, CA 95126

Alex Freed                                             92,679                   92,679
1206 Estrada Terrace
Sunnyvale, CA 94086

Michael Kharitonov                                     12,357                   12,357
145 West 71st Street
New York, NY 10023

Anatoly  Tikhman and Marina                            95,327                   95,327
Tikhman  Living Trust dated
9/15/97
C/o Anatoly Tikhman, Trustee
45 Live Oak Lane
Hillsborough, CA 94010

Robert R. Tillman Living Trust                          9,750                    9,750
dated 9/23/91
14 Sunshine Avenue
Sausalito, CA 94965

Total                                               6,817,428                6,817,428
</TABLE>

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

(1) One or more supplements or post-effective  amendments to this prospectus may
    be filed  pursuant to Rule 424, or otherwise,  under the  Securities  Act to


                                       18
<PAGE>

    describe  any  material  arrangements  for  sale  of  the  shares,  if  such
    arrangements are entered into by any selling securityholders.






                                       19
<PAGE>

                            PLAN OF DISTRIBUTION

     We are registering our securities on behalf of the selling securityholders.
Selling securityholders,  as used in this prospectus, includes donees, pledgees,
transferees or other successors in interest who may receive securities  received
from a named selling securityholder as a gift, partnership distribution or other
non-sale  related  transfer  after  the  date of this  prospectus.  The  selling
securityholders  will act  independently of the company in making decisions with
respect to the timing, manner and size of each sale. The selling securityholders
may offer their common stock and their warrants,  including the shares of common
stock  issuable  upon the exercise of the  warrants,  in various  amounts and at
various times in one or more of the following transactions;

    -   in ordinary  broker's  transactions on the Nasdaq National Market or any
        national  securities exchange on which our common stock may be listed at
        the time of sale;

    -   in the over-the-counter market;

    -   in privately negotiated  transactions other than in the over-the counter
        market;

    -   in  connection  with short sales of other  shares of our common stock in
        which the securities are redelivered to close out positioning;

    -   by pledge to secure debts and other obligations;

    -   in connection  with the writing of non-traded and  exchange-traded  call
        options,  in hedge  transactions and in settlement of other transactions
        in standardized or over-the-counter options;

    -   pursuant to Rule 144; or

    -   in a combination of any of the above transactions.

     The selling  securityholders  may sell their  securities  at market  prices
prevailing  at the time of sale,  at prices  related to such  prevailing  market
prices, at negotiated prices or at fixed prices. The selling securityholders may
use broker-dealers to sell their securities. If this happens, broker-dealers may
either receive  discounts or commissions  from the selling  securityholders,  or
they will receive  commissions  from  purchasers of the securities for whom they
acted as agents. This compensation may exceed customary commissions.

     The selling  securityholders and the broker-dealers to or through whom sale
of the  securities may be made could be deemed to be  "underwriters"  within the
meaning  of the  Securities  Exchange  Act of  1934  and  their  commissions  or
discounts and other  compensation  received in connection with such sales may be
regarded as underwriters' compensation.

    The anti-manipulation provisions of Rules 101 through 104 under


                                       20
<PAGE>

Regulation M of the  Securities  Exchange Act of 1934 may apply to purchases and
sales of common stock by the selling  securityholders.  In  addition,  there are
restrictions on market-making  activities by persons engaged in the distribution
of the common stock.

    None of the selling  securityholders  have advised us of any specific  plans
for the distribution of the securities  covered by this prospectus.  When and if
we are  notified  by  any  of the  selling  securityholders  that  any  material
arrangement  has been entered into with a broker dealer or  underwriter  for the
sale of a material  portion of the  securities  covered  by this  prospectus,  a
prospectus supplement or post-effective  amendment to the registration statement
will be filed setting forth:

    -   the name of the participating broker-dealer(s) or underwriters;

    -   the number of securities involved;

    -   the price or prices at which such  securities  were sold by the  selling
        securityholders;

    -   the commissions paid or discounts or concessions  allowed by the selling
        securityholders to such broker-dealers or underwriters; and

    -   other material information.

    We  have  agreed  to pay  all  costs  relating  to the  registration  of the
securities  (other than fees and expenses,  if any, of counsel or other advisors
to the  selling  securityholders).  Any  commissions  or other  fees  payable to
broker-dealers  in connection  with any sale of the securities  will be borne by
the selling securityholders or other party selling such security.


                                       21
<PAGE>

                                  LEGAL MATTERS

    The validity of the  securities  offered will be passed upon for us by Piper
Marbury Rudnick & Wolfe LLP, Washington, D.C.


                                    EXPERTS

    The  consolidated  financial  statements and schedule of VASCO Data Security
International,  Inc. as of December 31, 1998 and 1999, and for each of the years
in the three-year  period ended December 31, 1999 are  incorporated by reference
in this  registration  statement  in  reliance  upon  the  report  of KPMG  LLP,
independent  certified  public  accountants,  and are  incorporated by reference
herein in reliance upon the authority of said firm as experts in accounting  and
auditing.


                      WHERE YOU CAN FIND MORE INFORMATION

    We are subject to the informational  requirements of the Securities Exchange
Act of 1934 as amended,  and file annual,  quarterly and special reports,  proxy
statements  and  other  information  with  the  SEC.  You may  read and copy any
document we file, including the registration statement on Form S-3 of which this
prospectus is a part, at the SEC's public reference rooms:

<TABLE>
<CAPTION>
<S>                         <C>                          <C>
450 Fifth Street, N.W.      7 World Trade Center         500 West Madison Street
Street                      New York, New York           Suite 1400
Room 1024                                                Chicago, Illinois
Washington, D.C. 20549
60661
</TABLE>

    Our SEC filings are also  available to the public from the SEC's Web site at
"http://www.sec.gov". The SEC's phone number is 1-800-SEC-0330. In addition, any
of our SEC filings may also be inspected and copied at the offices of The Nasdaq
Stock Market, Inc., 1735 K Street, N.W., Washington, D.C. 20006.

    Companies  approved for trading on EASDAQ are  required to publish  relevant
financial and other information regularly and to keep the public informed of all
events  likely to affect the market price of their  securities.  Price-sensitive
information  is  available to  investors  in Europe  through the  EASDAQ-Reuters
Regulatory  Company  Reporting  System  and  other   international   information
providers.  Investors who do not have direct access to such  information  should
ask their  financial  advisors for the terms on which such  information  will be
provided to them by these financial  advisors.  We will ensure that a summary of
our quarterly and annual  financial  statements will be provided to stockholders
in Europe across the EASDAQ Company Reporting System, or ECR System. A hard copy
of the annual report will be provided to stockholders  promptly after it becomes


                                       22
<PAGE>

available.  Complete  quarterly  statements  will  either  be  sent by us to our
stockholders  or will be available  upon  request  from the us at our  executive
offices.  Copies of all documents filed by us with EASDAQ are also available for
inspection  at  the  offices  of  EASDAQ,  56 Rue de  Colonies,  Bte.15,  B-1000
Brussels, Belgium.

                           INCORPORATION BY REFERENCE

    We have filed with the SEC a  registration  statement  on Form S-3 under the
Securities  Act of 1933,  as amended,  with  respect to the  securities  offered
hereby. This prospectus, which constitutes a part of the Registration Statement,
does not contain all of the information set forth in the registration statement.
The SEC allows us to  "incorporate  by reference"  the  information we file with
them, which means that we can disclose important information to you by referring
to those documents.  The information  incorporated by reference is considered to
be part of this  prospectus,  and the  information  that we file at a later date
with the SEC will  automatically  update  and  supersede  this  information.  We
incorporate  by  reference  the  documents  listed  below as well as any  future
filings we will make with the SEC under Sections  13(a),  13(c),  14 or 15(d) of
the Securities Exchange Act of 1934, as amended:

    -   Our Annual Report,  including all amendments  thereto,  on Form 10-K for
        the year ended December 31, 1999.

    -   Our Quarterly  Reports on Form 10-Q for  the quarters  ending  March 31,
        June 30, and September 30, 2000.

    -   The  description of our Common Stock which is contained in the Company's
        Registration  Statement on Form S-4 (SEC File No. 333-35563).

    We will provide a copy of the documents we incorporate  by reference,  at no
cost,  to any person who  receives  this  prospectus.  You may request a copy of
these filings, by writing or telephoning us at the following address:

                     VASCO DATA SECURITY INTERNATIONAL, INC.
                        1901 SOUTH MEYERS ROAD, SUITE 210
                        OAKBROOK TERRACE, ILLINOIS 60181
                                 (630) 932-8844

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

    YOU  SHOULD  RELY  ONLY ON THE  INFORMATION  INCORPORATED  BY  REFERENCE  OR
PROVIDED IN THIS PROSPECTUS OR ANY PROSPECTUS SUPPLEMENT. WE HAVE NOT AUTHORIZED
ANYONE   ELSE  TO  PROVIDE   YOU  WITH   DIFFERENT   INFORMATION.   THE  SELLING
SECURITYHOLDERS  ARE NOT MAKING AN OFFER OF THESE  SECURITIES IN ANY STATE WHERE
THE OFFER IS NOT PERMITTED.  YOU SHOULD NOT ASSUME THAT THE  INFORMATION IN THIS
PROSPECTUS  OR ANY  PROSPECTUS  SUPPLEMENT IS ACCURATE AS OF ANY DATE OTHER THAN
THE DATE ON THE FRONT OF THE DOCUMENT.


                                       23
<PAGE>

                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION*

<TABLE>
<CAPTION>
<S>                                                           <C>
SEC Registration fee........................................  $19,685.32
Printing fee................................................    1,500.00
Accounting fees and expenses................................  $ 8,000.00
Legal fees and expenses.....................................   15,000.00
Miscellaneous...............................................    1,000.00
                                                                 -------
      Total.................................................  $35,185.32
</TABLE>

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

*   Estimated,  except for SEC  registration  fee. No portion of these  expenses
    will be borne by the selling securityholders.

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

    Section 145 of the Delaware General Corporation Law ("DGCL") provides that a
corporation  may indemnify  directors,  officers,  employees and agents  against
expenses  (including  attorneys'  fees),  judgments,  fines, and amounts paid in
settlement in connection with specified actions,  suits, or proceedings  whether
civil, criminal, administrative, or investigative (other than an action by or in
the right of the  corporation--a  "derivative  action"),  if they  acted in good
faith and in a manner  they  reasonably  believed to be in or not opposed to the
best interests of the  corporation  and, with respect to any criminal  action or
proceeding,  had no reasonable  cause to believe  their conduct was unlawful.  A
similar  standard is applicable in the case of derivative  actions,  except that
indemnification  is permitted  only for  expenses  (including  attorneys'  fees)
incurred in connection  with the defense or  settlement of such action,  and the
statute  requires court  approval  before there can be any  indemnification  for
expenses where the person seeking  indemnification  has been found liable to the
corporation.   The  statute   provides   that  it  is  not  exclusive  of  other
indemnification  that  may  be  granted  by  a  corporation's  charter,  bylaws,
disinterested director vote, stockholder vote, agreement, or otherwise.

    Article  V of the  Bylaws  of  Registrant  provides  that  Registrant  shall
indemnify and hold harmless,  to the fullest extent  permitted by applicable law
as it presently exists or may hereafter be amended, any person (an "Indemnitee")
who was or is made or is threatened to be made a party or is otherwise  involved
in any action, suit or proceeding,  whether civil,  criminal,  administrative or
investigative (a  "proceeding"),  by reason of the fact that he, or a person for
whom he is the legal  representative,  is or was a  director  or  officer of the
Registrant or, while a director or officer of the Registrant,  is or was serving
at the written  request of the  Registrant as a director,  officer,  employee or
agent  of  another  corporation  or  of a  partnership,  joint  venture,  trust,
enterprise  or  nonprofit  entity,  including  service  with respect to employee
benefit plans,  against all liability and loss suffered and expenses  (including


                                      II-1
<PAGE>

attorneys' fees) reasonably  incurred by such  Indemnitee.  Notwithstanding  the
preceding  sentence,  except as otherwise  provided in Section 3 of Article V of
such Bylaws,  the  Registrant  shall be required to indemnify an  Indemnitee  in
connection with a proceeding (or part thereof) commenced by such Indemnitee only
if the  commencement  of such proceeding (or part thereof) by the Indemnitee was
authorized by the Board of Directors.

ITEM 16. EXHIBITS.

<TABLE>
<CAPTION>
NUMBER                                   DESCRIPTION
------          ------------------------------------------------------------
<S>               <C>
3.1*              Restated Certificate of Incorporation
3.2*              Bylaws
5.1               Opinion of Piper Marbury Rudnick & Wolfe LLP
23.1**            Consent of Arthur Andersen LLP
23.2              Consent of Piper Marbury Rudnick & Wolfe LLP (included in
                  Exhibit 5.1)

</TABLE>

------------------------
*    Incorporated by reference from _____.
**   Previously filed.


ITEM 17. UNDERTAKINGS.

    The undersigned registrant hereby undertakes:

    (1) To file,  during any period in which  offers or sales are being made,  a
post-effective  amendment  to this  Registration  Statement:  (i) to include any
prospectus  required by Section  10(a)(3) of the Securities Act of 1933; (ii) to
reflect in the  prospectus  any facts or events arising after the effective date
of this  registration  statement  (or the most recent  post-effective  amendment
thereof) which, individually or in the aggregate, represent a fundamental change
in the information set forth in this registration statement, notwithstanding the
foregoing,  any  increase or decrease  in volume of  securities  offered (if the
total  dollar  value of  securities  offered  would not  exceed  that  which was
registered) and any deviation from the low or high end of the estimated  maximum
offering  range  may be  reflected  in the  form of  prospectus  filed  with the
Commission  pursuant to Rule 424(b) if, in the aggregate,  the changes in volume
and price  represent  no more than 20 percent  change in the  maximum  aggregate
offering price set forth in the  "Calculation of Registration  Fee" table in the
effective registration statement; (iii) to include any material information with
respect  to  the  plan  of  distribution   not  previously   disclosed  in  this
Registration  Statement  or any  material  change  to  such  information  in the
registration  statement;  provided,  however, that the undertakings set forth in
paragraphs  (i) and (ii) above do not apply if the  information  required  to be
included in a  post-effective  amendment  by those  paragraphs  is  contained in
periodic  reports  filed by the  registrant  pursuant  to  Section 13 or Section
15(d)of the  Exchange  Act of 1934 that are  incorporated  by  reference  in the
registration statement.


                                      II-2
<PAGE>

    (2) That, for the purpose of determining  any liability under the Securities
Act of 1933,  each  such  post-effective  amendment  shall be deemed to be a new
registration  statement  relating  to the  securities  offered  herein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

    (3) To remove from  registration by means of a post-effective  amendment any
of the securities being registered hereby which remain unsold at the termination
of the offering.

    (4) That, for the purpose of determining  any liability under the Securities
Act of 1933, each filing of the  registrant's  annual report pursuant to Section
13(a) or  Section  15(d) of the  Exchange  Act of 1934 that is  incorporated  by
reference in the registration statement shall be deemed to be a new registration
statement relating to the securities  offered therein,  and the offering of such
securities  at that time shall be deemed to be the  initial  bona fide  offering
thereof.

    Insofar as indemnification  for liabilities arising under the Securities Act
of 1933 may be permitted to directors,  officers and controlling  persons of the
registrant pursuant to the foregoing  provisions,  or otherwise,  the registrant
has been advised that in the opinion of the Securities  and Exchange  Commission
such indemnification is against public policy as expressed in the Securities Act
of  1933  and is,  therefore,  unenforceable.  In the  event  that a  claim  for
indemnification  against  such  liabilities  (other  than  the  payment  by  the
registrant of expenses  incurred or paid by a director,  officer or  controlling
person of the  registrant  in the  successful  defense  of any  action,  suit or
proceeding) is asserted by such  director,  officer,  or  controlling  person in
connection with the securities being registered,  the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against  public policy as expressed in the  Securities
Act of 1933 and will be governed by the final adjudication of such issue.





                                      II-3
<PAGE>

                                   SIGNATURES


     Pursuant to the  requirements of the Securities Act of 1933, the registrant
certifies  that it has  reasonable  grounds  to  believe  that it meets  all the
requirements  for  filing  on Form S-3 and has duly  caused  this  pre-effective
amendment  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of Oakbrook Terrace, State of Illinois, as this 13th day
of November 2000.


                                       VASCO DATA SECURITY INTERNATIONAL, INC.

                                       BY: /s/ Mario R. Houthooft
                                           -----------------------------------
                                               Mario R. Houthooft
                                               President and Chief Executive
                                                Officer





                                      II-4
<PAGE>

    Pursuant  to  the   requirements   of  the  Securities  Act  of  1933,  this
registration  statement  has  been  signed  by  the  following  persons  in  the
capacities indicated as of  November 13, 2000:

<TABLE>
<CAPTION>
SIGNATURE                                TITLE
---------                                -----
<S>                         <C>
/s/Mario R. Houthooft
----------------------
Mario R. Houthooft          President, Chief Executive Officer and Director
                             (Principal Executive Officer)

/s/ T. Kendall Hunt
----------------------
T. Kendall Hunt             Chairman of the Board and Executive Vice President
                             (Principal Financial Officer)


----------------------
Christian Dumolin                       Director


----------------------
Michael P. Cullinane                    Director


----------------------
Pol Hauspie                             Director

/s/ Forrest D. Laidley
----------------------
Forrest D. Laidley                      Director

/s/ Michael A. Mulshine
----------------------
Michael A. Mulshine                     Director
</TABLE>





                                      II-5
<PAGE>
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
NUMBER                                   DESCRIPTION
------          ------------------------------------------------------------
<S>               <C>
3.1*              Restated Certificate of Incorporation
3.2*              Bylaws
5.1               Opinion of Piper Marbury Rudnick & Wolfe LLP
23.1**            Consent of Arthur Andersen LLP
23.2              Consent of Piper Marbury Rudnick & Wolfe LLP (included in
                  Exhibit 5.1)
</TABLE>

------------------------
*    Incorporated by reference from _____.
**   Previously filed.


                                      II-6


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