VASCO To Release Q2 2009 Results On July 23, 2009 - Dial-In Information

OAKBROOK TERRACE, Illinois and ZURICH, Switzerland – July 13, 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 (empty).

Thedial-in telephone numbers for the conference call are:

Dial in US: 800-736-4594

Dial in Internationall: +1 212-231-2905

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.