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// initialize PdfFormat
PdfFormat pdfFormat = new PdfFormat(Common.mapSourceFilePath(path));
// get document properties
PdfMetadata properties = pdfFormat.getDocumentProperties();
// update built-in properties
properties.setAuthor("test author");
properties.setSubject("test subject");
properties.setTrappedFlag(true);
// commit changes
pdfFormat.save(Common.mapDestinationFilePath(outputPath));