Programmatically encrypt PDF using User Certifcate

Hi all,
I would like to programmatically encrypt a pdf using a user certificate (.cer), where the user certificate is stored in a specified directory. Is there a way to do it using vb.net? I had a look at the the acrobat sdk, but couldn't find relevant coding samples to perform the above.
Please help.
Thanks.
Jess

I now try to write the pass the AcroJS script in my vb.net code through the addScript function of the JSObject:
Dim jso As Object = pdDoc.GetJSObject
Dim JSScript As String = "security.getHandler(""Adobe.PPKMS"", true); "
jso.addScript("Test", JSScript)
However, it gave an error when i tried to execute the getHandler function. I tried putting the code directly into Acrobat as well and that didn't work either.
Am I missing something? Please help.
Thanks.
Jess

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Programmatically encrypt PDF using User Certifcate

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