UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a)

of the Securities Exchange Act of 1934

Filed by the registrant  x

Filed by a party other than the registrant  ¨

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¨	Preliminary Proxy Statement	¨	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)).
¨	Definitive Proxy Statement
x	Definitive Additional Materials
¨	Soliciting Material Pursuant to §240.14a-12

VASCO Data Security International, Inc.

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement if Other Than the Registrant)

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¨ Fee paid previously with preliminary materials.

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*** Exercise Your Right to Vote ***

Important Notice Regarding the Availability of Proxy Materials for the

Shareholder Meeting to Be Held on June 16, 2011

			Meeting Information
	VASCO DATA SECURITY INTERNATIONAL, INC.		Meeting Type: Annual Meeting
			For holders as of: April 25, 2011
			Date: June 16, 2011          Time: 10:00 AM CDT
			Location: 1901 S. Meyers Road
			Oakbrook Terrace, IL 60181
			You are receiving this communication because you hold shares in the above named company.
			This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side).
			We encourage you to access and review all of the important information contained in the proxy materials before voting.
		See the reverse side of this notice to obtain proxy materials and voting instructions.

	— Before You Vote — How to Access the Proxy Materials
	Proxy Materials Available to VIEW or RECEIVE: 1. Notice & Proxy Statement        2. Annual Report/Form 10-K How to View Online: Have the information that is printed in the box marked by the arrow      (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:
	1) BY INTERNET:	www.proxyvote.com
	2) BY TELEPHONE:	1-800-579-1639
	3) BY E-MAIL*:	sendmaterial@proxyvote.com
	*   If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow      (located on the following page) in the subject line.
	Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before June 02, 2011 to facilitate timely delivery.
	— How To Vote — Please Choose One of the Following Voting Methods
	Vote In Person: If you choose to vote these shares in person at the meeting, you must request a “legal proxy.” To do so, please follow the instructions at www.proxyvote.com or request a paper copy of the materials, which will contain the appropriate instructions. Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance.
	Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow      available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a voting instruction form.

	Voting items
The Board of Directors recommends that you vote FOR the following:

	1.	Election of Directors
		Nominees
	01	T. Kendall Hunt	02	Michael P. Cullinane	03	John N. Fox, Jr.	04	John R. Walter	05	Jean K. Holley
	The Board of Directors recommends you vote FOR the following proposal(s):
	2	Approve, by non-binding vote, the executive compensation.
	The Board of Directors recommends you vote 3 YEARS on the following proposal:
	3	Recommend, by non-biding vote, the frequency of vote on executive compensation.
	The Board of Directors recommends you vote FOR the following proposal(s):
	4	Ratify the appointment of KPMG LLP as independent auditor for fiscal year ending December 31, 2011
	NOTE: Such other business as may properly come before the meeting or any adjournment thereof.