SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
                       PURSUANT TO SECTION 13 OR 15(D) OF
                       THE SECURITIES EXCHANGE ACT OF 1934

       Date of Report (Date of earliest event reported): December 16, 2004

                     VASCO DATA SECURITY INTERNATIONAL, INC.

               (Exact name of registrant as specified in charter)

           Delaware                   000-24389               36-4169320
 (State or other jurisdiction        (Commission             (IRS Employer
       of incorporation)            File Number)          Identification No.)


                        1901 South Meyers Road, Suite 210
                        Oakbrook Terrace, Illinois 60181
                    (Address of principal executive offices)

                          (630) 932-8844 (Registrant's
                     telephone number, including area code)

                                       N/A
          (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2. below):

[  ]   Written communications pursuant to Rule 425 under the Securities Act (17
       CFR 230.425)

[  ]   Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17
       CFR 240.14a-12)

[  ]   Pre-commencement communications pursuant to Rule 14d-2(b) under the
       Exchange Act (17 CFR 240.14d-2(b))

[  ]   Pre-commencement communications pursuant to Rule 13e-4(c) under the
       Exchange Act (17 CFR 240.13e-4(c))


                                       1

SECTION 2.02 - RESULTS OF OPERATIONS AND FINANCIAL CONDITION ITEM 2.02. RESULTS OF OPERATIONS AND FINANCIAL CONDITION. On December 16, 2004, VASCO Data Security International, Inc. ("VASCO") issued a press release and held a broadly accessible conference call to provide a financial update for the fourth quarter and full-year ended December 31, 2004 and financial guidance for the full-year 2005. The press release is attached hereto as Exhibit 99.1 and the transcript of prepared remarks made by officers of VASCO during the conference call is attached hereto as Exhibit 99.2. The information in this report shall not be treated as "filed" for purposes of the Securities Exchange Act of 1934, as amended, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing. SECTION 9 - FINANCIAL STATEMENTS AND EXHIBITS ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS. (c) Exhibits Exhibit Number Description ------- ------------------------------------------------------ 99.1 Press release issued December 16, 2004. 99.2 Text of prepared remarks for December 16, 2004 Guidance Conference Call. 2

SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Date: December 16, 2004 VASCO Data Security International, Inc. --------------------------------------- (Registrant) By: /s/Clifford K. Bown --------------------------------------- Clifford K. Bown Chief Financial Officer 3

EXHIBIT INDEX Exhibit No. Description - ----------- --------------------------------------------------------------- 99.1 Press release issued December 16, 2004. 99.2 Text of prepared remarks for December 16, 2004 Guidance Conference Call. 4

                                                                    EXHIBIT 99.1

VASCO Provides Full-Year 2005 Guidance; Reaffirms Full-Year 2004 Guidance

Full-year 2005 revenue expected to increase 35-45% over 2004. Full-year 2005
gross profit and operating income, as a percentage of revenue, expected to range
from 60-65% and 15-20%, respectively.

OAKBROOK TERRACE, Illinois and BRUSSELS, Belgium - December 16, 2004 - VASCO
Data Security International, Inc. (Nasdaq: VDSI: www.vasco.com), a global
provider of enterprise-wide security products that support e-business and
e-commerce, today provided guidance for its full-year 2005 results. In addition,
VASCO reaffirmed its guidance for the full year 2004. VASCO's Senior Management
will discuss the guidance today at 10:00 am EST/16:00 pm CET.

VASCO expects its full-year 2005 revenue to grow 35% to 45% over full-year 2004
revenue. VASCO believes that its growth rate in 2005 will accelerate over its
growth rate in 2004 as a result of an increase in the size of the authentication
market, an increase in the size and strength of its distribution channel, an
increase in its customer base and an increase in its penetration of the retail
or consumer banking market, which will be reflected in a higher average order
size and a lower average selling price.

Consistent with the increase in average order size, VASCO expects its gross
profit as a percentage of revenue to be in the range of 60% to 65% and its
operating income as a percentage of revenue to be in the range of 15% to 20%.
Operating income as a percentage of revenue also reflects VASCO's plan to
continue to increase its investment in sales and marketing in order to expand
the market's awareness of both the benefits from stronger authentication and
VASCO's capabilities to provide state-of-the-art strong authentication.

VASCO reaffirms its full-year 2004 guidance, which includes revenue growth of
23% to 27% over full-year 2003, gross profit as a percentage of revenue of 65%
to 69% and operating income as a percentage of revenue of 17% to 20%.

Within the context of the full-year 2004 guidance, VASCO expects that full-year
2004 earnings per fully-diluted common share will range from $0.09 to $0.10 per
share.

VASCO believes that, as expected, the fourth quarter of 2004 results will
reflect an increase in the revenue growth rate over 2003 with lower gross profit
and operating margins than in prior quarters of 2004. VASCO expects that the
fourth quarter results will include significant shipments related to larger
orders and reflect higher operating expenses primarily related to its increased
investment in sales and marketing and the continued strengthening of the Euro.
VASCO expects that fourth quarter 2004 earnings per fully-diluted common share
will range from $0.01 to $0.02 per share.

"We believe that VASCO's growth rate will accelerate in 2005 reflecting the
markets' increasing awareness of the need for strong authentication and the
increasing recognition of the strength of VASCO's product offering," said Ken
Hunt, VASCO's Chairman and CEO. "Over the last two years, VASCO has successfully
executed its turnaround plan and demonstrated its ability to achieve
double-digit growth. From that success, we were able to increase our investment
in sales and marketing in the second half of 2004 and increase the markets'
awareness of our capabilities, especially related to large-scale deployment of
authentication tokens to the retail or consumer level. We look forward to
continuing our investment, increasing the markets' awareness of our
capabilities, and establishing a strong growth rate for the foreseeable future."

Today, at 10:00 am EST/16.00 CET VASCO will hold a conference call, which will
be streamed on the VASCO website (www.vasco.com). Dial-in telephone numbers for
the conference call:
Dial-in US: 888-424-5801
Dial-in International: +1 973-409-9258

ABOUT VASCO: VASCO designs, develops, markets and supports patented "Identity Authentication" products for e-business and e-commerce. VASCO's Identity Authentication software is delivered via its Digipass hardware and software security products. For user access control, VASCO's VACMAN products guarantee that only designated Digipass users get access to the application. With over 12,5 million Digipass products sold and ordered, VASCO has established itself as a world-leader for strong Identity Authentication with over 300 international financial institutions and approximately 1,400 blue-chip corporations and governments located in more than 80 countries. Forward Looking Statements Statements made in this news release that relate to future plans, events or performances are forward-looking statements. Any statement containing words such as "believes," "anticipates," "plans," "expects," and similar words, is forward-looking, and these statements involve risks and uncertainties and are based on current expectations. Consequently, actual results could differ materially from the expectations expressed in these forward-looking statements. Reference is made to the Company's public filings with the US Securities and Exchange Commission for further information regarding the Company and its operations. For more information contact: Jochem Binst, +32 2 456 9810, jbinst@vasco.com ----------------

                                                                    EXHIBIT 99.2

                 2005 GUIDANCE CONFERENCE CALL DECEMBER 16, 2004

Ken Hunt:

Good morning everyone. For those listening in from Europe, good afternoon, and
from Asia, good evening.

We have continuing good news to discuss with you today!

My name is Ken Hunt, and I am the Chairman, Founder & CEO of VASCO Data Security
International, Inc. I'm here with Cliff Bown, VASCO's CFO, and Jan Valcke,
VASCO's President and Chief Operating Officer, who is joining us from Brussels,
Belgium.

Before we begin the conference call, I need to brief all of you on "Forward
Looking Statements."

FORWARD LOOKING STATEMENTS
STATEMENTS MADE IN THIS CONFERENCE CALL THAT RELATE TO FUTURE PLANS, EVENTS OR
PERFORMANCES ARE FORWARD-LOOKING STATEMENTS. ANY STATEMENT CONTAINING WORDS SUCH
AS "BELIEVES," "ANTICIPATES," "PLANS," "EXPECTS," AND SIMILAR WORDS, IS
FORWARD-LOOKING, AND THESE STATEMENTS INVOLVE RISKS AND UNCERTAINTIES AND ARE
BASED ON CURRENT EXPECTATIONS. CONSEQUENTLY, ACTUAL RESULTS COULD DIFFER
MATERIALLY FROM THE EXPECTATIONS EXPRESSED IN THESE FORWARD-LOOKING STATEMENTS.
I DIRECT YOUR ATTENTION TO THE COMPANY'S FILINGS WITH THE SECURITIES AND
EXCHANGE COMMISSION FOR A DISCUSSION OF SUCH RISKS AND UNCERTAINTIES IN THIS
REGARD.

GENERAL COMMENTS - KEN HUNT

First, I would like to thank those of you who have been loyal supporters of this
Company for many years. I know that there are many of you who bought shares well
before the tech "bubble" and have held on to this date. You have been unwavering
in your trust and confidence in this Company. I want you to know that all of us
at VASCO truly appreciate your loyalty and confidence.

I also wish to thank those of you who more recently have invested in VASCO.
Somehow, you became aware of our Company, took an interest, and decided to
purchase our shares.

When we reorganized in November of 2002, we faced many daunting challenges. We
were losing money and burning cash; we had one business unit that was no longer
part of our "core" business; we had a preferred stock issue outstanding that had
the potential to dilute existing shareholders' positions significantly; we owed
a bank several million dollars in principal and interest; and we had a nasty
lawsuit that was distracting us from our business and costing us money to
defend.

As most of you know, we successfully addressed all of these challenges. We sold that business unit; we bought back the potentially dilutive preferred stock at a significant discount; we paid off our bank loan plus interest; and we settled our lawsuit. On top of all of this, we managed to turn our business around starting in the very first quarter of 2003. In every quarter of 2003, we produced a positive operating income and generated positive operating cash flow. In 2004, we began to demonstrate the leverage in our business model by delivering very meaningful results in every quarter. In our recent 3rd Quarter Conference Call, we described a very solid and profitable 3rd Quarter, 2004. Our revenues were $7,400,000, up 32% over the 3rd Quarter of 2003; our Gross margin as a percentage of revenue was 70%, and our Operating Income as a percentage of revenue was 22.7%. For the first nine months, revenues were $20.6 million or 24% higher than the same period in 2003. Gross profit as a percentage of revenue for the first nine months of 2004 was approximately 71%. And, Operating income for the first nine months of 2004 was $4,059,000, an increase of $3,301,000 or 436% from the $758,000 reported for the same period in 2003. Operating Income was 20% of revenue for the first nine months. GUIDANCE FOR 2005 Last Thursday, December 10th, VASCO's Board of Directors met to review management's forecast for 4th Quarter and Full-Year 2004, and to review and approve management's business plan for 2005. Based on the results of that meeting, VASCO's Board determined that it was in the best interest of our shareholders to give guidance for 2005 as soon as practicable. First let me say that we expect our revenue growth rate for 2005 to accelerate over our growth rate in 2004. We make this informed judgment based on our success in 2004, our detailed analysis of the markets that we have targeted, and our current backlog for 2005. Our mission and commitment will be to realize this growth while maintaining one of the most profitable companies in our industry sector. Now, on to our expectations for 2005. We expect our revenue growth for full-year 2005 to be in a range of 35-45% over full-year 2004. We expect our gross margin as percent of revenue to be in a range of 60-65%. And finally, we expect our operating income as a percent of revenue to be in a range of 15-20%.

The guidance being given for 2005 reflects some significant developments in the business as compared to the first three quarters of 2004. First, we expect our growth to accelerate in 2005 over 2004 as a result of an increase in the size of the authentication market, an increase in the size and strength of our distribution channel, an increase in our customer base and an increase in the average size of orders received. As we discussed previously, many of our banking customers start with smaller orders for pilot programs and then increase the size of their orders for rollout to the retail customer base. We expect to receive and fill orders for several large retail banking deployments in 2005. As we have discussed in previous communications, we provide discounts for volume purchase orders and those orders are expected to have lower gross margins as a percentage of revenue. Our guidance for gross margins as a percentage of revenue reflects that change in mix of orders. Second, as we have also discussed in previous communications, VASCO has started, and plans to continue throughout 2005, to increase its investment in sales and marketing to increase the market's awareness of VASCO's solutions, strengthen our distribution channel and increase our presence in new markets. You may have recently noted our press release regarding the expansion of our sales office in Boston and the opening of our office in Shanghi, China. Both actions, taken in 2004, are examples of our plan for 2005. For full-year 2004, we reaffirm our previous guidance given at our 3rd Quarter Earnings Conference Call. This was full-year revenue growth of 23-27% in 2004 as compared to 2003; Gross Margin as a percentage of revenue in a range of 65-69%; and Operating Income as a percentage of revenue in a range of 17-20%. Given that the fourth quarter can be derived by subtracting the year-to-date third quarter results from the full-year 2004 guidance, I would like to make a couple of comments on the fourth quarter. We expect that the results for the fourth quarter of 2004 will reflect the trend forecasted for 2005 previously noted in this call. That is higher revenue and lower gross margins as a result of shipments made on some large-volume orders. Results for the quarter will also reflect our increased investment in sales and marketing previously noted. With all factors considered, we expect that earnings per fully-diluted share will be in the range of $0.01 to $0.02 per share for the fourth quarter of 2004. Combined with the actual results for the first three quarters of 2004, earnings per fully-diluted share will be in the range of $0.09 to $0.10 per share for the full-year 2004.

In closing, I would like to note that our guidance for 2005 does not reflect any significant benefit from the rollout of the new EMV standard. Let me also emphasize that the guidance being provided is for full-year 2005, which is consistent with our practice for 2004. Also, please note that individual quarters within 2005 may vary from the ranges previously discussed due to the variation in the mix of orders received and the seasonality of the business. We will update our guidance for full-year 2005 as new information becomes available that results in a significant change to our expectations for the year. Q&A Session: This concludes our prepared remarks for today and we will now open the call for questions. Operator