Remove encryption from PDF file using Apache PDFBox

With QPDF, you can simply remove restrictions / encryption from a PDF file like so:

qpdf --decrypt infile outfile

I would like to do the same thing with PDFBox in Java:

PDDocument doc = PDDocument.load(inputFilename);
if (doc.isEncrypted()) {
   // remove the encryption to alter the document
}

I've tried this with StandardDecryptionMaterial, but I have no idea what the owner password is. How does QPDF does this?

java pdf pdfbox

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