VASCO to Release Q2 2009 Results on July 23, 2009

OAKBROOK TERRACE, Ill. and ZURICH, July 6 /PRNewswire-FirstCall/ -- 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, jbinst@vasco.com

SOURCE VASCO Data Security International, Inc.

Jochem Binst, VASCO Data Security International Inc., +32 2 609 97 00,
jbinst@vasco.com