How does Password-protect PDF work?

In EchoSign API, one can set a password to open a PDF. I believe the syntax to use is securityOptions; set protectOpen = true and OpenPassword = xxxx. However, when I download the pdf, it didn't ask me for password. Could anyone in the know please chime in? Thanks!
API Methods — Document eSignature Software — EchoSign

Hi Rijul,
Here is the security setting from my httprequest:
<securityOptions xmlns="http://dto8.api.echosign">
<externalPassword xmlns="http://dto.api.echosign" xsi:nil="true"/> 
<internalPassword xmlns="http://dto.api.echosign" xsi:nil="true"/>
<openPassword xmlns="http://dto.api.echosign">2fpwxLdIfS</openPassword>
</securityOptions>
Here is my API call:
            SecurityOptions securoptions = new SecurityOptions
                protectOpen = true,
                openPassword = _pdfKey
            WidgetCreationInfo widgetcreationinfo = new WidgetCreationInfo
                name = _formName,
                fileInfos = new DonorPortal.Web.UI.com.echosign.secure.FileInfo[] { fileinfo },
                signatureFlow = SignatureFlow.SENDER_SIGNATURE_NOT_REQUIRED,
                securityOptions = securoptions,
                widgetCompletionInfo = wCompletionInfo

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