The PDF::Tk documentation clearly states that the call_pdftk method "Calls up pdftk command, takes input, output and pdftk operation as arguments input and output can either be files or scalar refs. input can also be an array ref of files". I don't see any indication that it will take anything other than three arguments.

When I look at the PDFTk site, I can see that they have a product called PDFtk Server that gives you command-line capabilities. On their examples page, it even shows example command lines for encrypting and decrypting PDFs. So perhaps you might try PDFtk Server and use perl's system function (perldoc -f system) to call it under program control.

...roboticus

When your only tool is a hammer, all problems look like your thumb.

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