VASCO To Release Q2 2009 Results On July 23, 2009

OAKBROOK TERRACE, Illinois and ZURICH, Switzerland – July 6, 2009 – VASCO Data Security International Inc. (Nasdaq: VDSI; www.vasco.com), a leading software security company specializing in strong authentication products, announced today that it will release its Q2 2009 results on July 23, 2009.

On July 23, at 10.00 am EDT/16.00 CET, VASCO will hold a conference call, which will be streamed on the VASCO website (www.vasco.com).

The dial-in telephone numbers for the conference call will be announced shortly.

Mr. T. Kendall Hunt, Chairman and CEO, Mr. Jan Valcke, President and COO and Mr. Cliff Bown, Executive Vice President and CFO of VASCO, will be available on July 23 to answer analyst, investor and media questions.

About VASCO

VASCO is a leading supplier of strong authentication and e-signature solutions and services specializing in Internet Security applications and transactions. VASCO has positioned itself as global software company for Internet Security serving a customer base of approximately 8,500 companies in more than 100 countries, including more than 1,250 international financial institutions. VASCO’s prime markets are the financial sector, enterprise security, e-commerce and e-government.

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,” “intend,” “mean,” 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.

This document may contain trademarks of VASCO Data Security International, Inc. and its subsidiaries, which include VASCO, the VASCO “V” design, DIGIPASS, VACMAN, aXs GUARD and IDENTIKEY.

For more information contact:

Jochem Binst, +32 2 609 97 00, [email protected]