<SEC-DOCUMENT>0001179110-17-015351.txt : 20171214
<SEC-HEADER>0001179110-17-015351.hdr.sgml : 20171214
<ACCEPTANCE-DATETIME>20171214122155
ACCESSION NUMBER:		0001179110-17-015351
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20171214
FILED AS OF DATE:		20171214
DATE AS OF CHANGE:		20171214

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Gilliland Arthur W
		CENTRAL INDEX KEY:			0001721978

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24389
		FILM NUMBER:		171255641

	MAIL ADDRESS:	
		STREET 1:		1901 S. MEYERS RD., STE 210
		CITY:			OAKBROOK TERRACE
		STATE:			IL
		ZIP:			60181

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			VASCO DATA SECURITY INTERNATIONAL INC
		CENTRAL INDEX KEY:			0001044777
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER INTEGRATED SYSTEMS DESIGN [7373]
		IRS NUMBER:				364169320
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1901 SOUTH MYERS ROAD
		STREET 2:		SUITE 210
		CITY:			OAKBROOK TERRACE
		STATE:			IL
		ZIP:			60181
		BUSINESS PHONE:		6309328844

	MAIL ADDRESS:	
		STREET 1:		1919 S HIGHLAND AVE
		STREET 2:		STE 118 C
		CITY:			LOMBARD
		STATE:			IL
		ZIP:			60148
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 3 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2017-12-14</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001044777</issuerCik>
        <issuerName>VASCO DATA SECURITY INTERNATIONAL INC</issuerName>
        <issuerTradingSymbol>VDSI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001721978</rptOwnerCik>
            <rptOwnerName>Gilliland Arthur W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1901 S. MEYERS RD., STE 210</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>OAKBROOK TERRACE</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60181</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock, $0.001 par value</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <remarks>Exhibit List: Exhibit 24 Limited Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Mark S. Hoyt, Attorney in Fact</signatureName>
        <signatureDate>2017-12-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>ex24gilliland.htm
<TEXT>
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<title></title>
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<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: right"><B>Exhibit 24</B></p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0"><b>&#160;</b></p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: center"><B>LIMITED POWER OF ATTORNEY<BR>
&#160;</B></p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: center"><B>FOR</B></p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: center"><B>&#160;</B></p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: center"><B>VASCO DATA SECURITY INTERNATIONAL,
INC.</B></p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: center"><B>&#160;</B></p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: center"><B>SECTION 16(a) FILINGS</B></p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: center">&#160;</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">Know all by these
presents that the undersigned hereby constitutes and appoints each of VASCO Data Security International, Inc. and Mark S. Hoyt,
signing singly, the undersigned's true and lawful attorney-in-fact to:</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify">&#160;</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">(1) Execute for
and on behalf of the undersigned, in the undersigned's capacity as an officer, director and/or stockholder of VASCO Data Security
International, Inc. (the &#8220;Company&#8221;), Forms 3, 4, and 5 and amendments thereto in accordance with Section 16(a) of the
Securities Exchange Act of 1934 and the rules thereunder;</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify">&#160;</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">(2) Do and perform
any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form
3, 4, or 5 or amendment thereto and timely file such form with the United States Securities and Exchange Commission (the &#8220;SEC&#8221;)
and any stock exchange or similar authority; and</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify">&#160;</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">(3) Take any other
action of any type whatsoever which, in the opinion of such attorney-in-fact, may be necessary or desirable in connection with
the foregoing authority, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned
pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may
approve.</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify">&#160;</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">The undersigned
hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes
as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and
confirming all that such attorney-in-fact, or such attorney-in-fact&#8217;s substitute or substitutes, shall lawfully do or cause
to be done by virtue of this Power of Attorney and the rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company
assuming, any of the undersigned&#8217;s responsibilities to comply with Section 16 of the Securities Exchange Act of 1934.</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify">&#160;</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">This Power of Attorney
shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the
undersigned&#8217;s holdings of and transaction in securities of the Company, unless earlier revoked by the undersigned in a signed
writing delivered to the foregoing attorneys-in-fact. This Power of Attorney may be filed with the SEC as a confirming statement
of the authority granted herein.</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">IN WITNESS WHEREOF,
the undersigned has caused this Power of Attorney to be executed as of this 2<sup>nd</sup> day of November 2017.</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"></p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify">&#160;</p>

<p style="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 12pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 50%; border-bottom: Black 1pt solid">/s/ Arthur W. Gilliland</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>Arthur W. Gilliland&#160;</TD></TR>
</TABLE>

<P STYLE="font: 12pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify">&#160;&#160;</p>


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</SEC-DOCUMENT>
