This sample will scrub the document for PDF features that can make the rendered appearance of a PDF document vary. It will then generate and add the LegalAttestation object to the document catalog.

GenerateLegalAttestation.java

/*
 * Copyright Datalogics, Inc. 2015
 */

package pdfjt.cookbook.document;

import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;

import pdfjt.util.SampleFileServices;

import com.adobe.internal.io.ByteReader;
import com.adobe.internal.io.ByteWriter;
import com.adobe.internal.io.InputStreamByteReader;
import com.adobe.pdfjt.pdf.digsig.PDFLegalAttestation;
import com.adobe.pdfjt.pdf.document.PDFDocument;
import com.adobe.pdfjt.pdf.document.PDFOpenOptions;
import com.adobe.pdfjt.pdf.document.PDFSaveFullOptions;
import com.adobe.pdfjt.services.digsig.LegalScrubber;
import com.adobe.pdfjt.services.digsig.impl.LegalWarning;

/**
 * This sample will scrub the document for PDF features that can make the
 * rendered appearance of a PDF document vary. It will then generate and add the
 * LegalAttestation object to the document catalog.
 */
public class GenerateLegalAttestation {

    private static final String inputPDFURL = "http://dev.datalogics.com/cookbook/document/LegalScrubber.pdf";
    private static final String outputDir = "cookbook/Document/output/";
    
    static public void main(String[] args) throws Exception {
        URLConnection connection = new URL(inputPDFURL).openConnection();
        connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.95 Safari/537.11");
        connection.connect();
        InputStream fis = connection.getInputStream();        
        ByteReader byteReader = new InputStreamByteReader(fis);
        PDFDocument pdfDocument = PDFDocument.newInstance(byteReader, PDFOpenOptions.newInstance());
        
        /*
         * Create a new LegalScrubber and generate the warnings Map.
         */
        LegalScrubber legalScrubber = LegalScrubber.newInstance(pdfDocument);
        @SuppressWarnings("unchecked")
        Map<LegalWarning, Integer> legalWarnings = legalScrubber.generateWarnings();
        
        /*
         * Check for specific warnings.
         * The first three conditions are present in the sample input document.
         * The fourth is not. It is left as a developer exercise to supply
         * warnings for all other LegalWarning constants.
         */
        if (legalWarnings.containsKey(LegalWarning.k_OptionalContent)) {
            System.out.println("This document contains layers that can be silently displayed or hidden on the fly.");
        }
        if (legalWarnings.containsKey(LegalWarning.k_NonEmbeddedFonts)) {
            System.out.println("This document uses fonts that are not embedded. Displayed text may be appear different from what was intended.");
        }
        if (legalWarnings.containsKey(LegalWarning.k_Annotations)) {
            System.out.println("The document contains comments whose visual appearances may change based on external variables.");
        }
        if (legalWarnings.containsKey(LegalWarning.k_JavaScriptActions)) {
            System.out.println("The document contains hidden actions that may not be known by the end user. Actions include JavaScript actions (document open, save, etc.), playing multimedia, executing a menu item, etc.");
        }
 
        /*
         * Generate and add the LegalAttestation to the document catalog. See
         * section 12.8.5 Legal Content Attestations of the PDF Specification.
         */
        PDFLegalAttestation legalAttestation = legalScrubber.generateLegalAttestation();
        pdfDocument.requireCatalog().setLegalAttestation(legalAttestation);
                
        String outputFileName = "OutputWithLegalAttestation.pdf";
        ByteWriter outputFile = SampleFileServices.getRAFByteWriter(outputDir + outputFileName);
        SampleFileServices.createDir(outputDir);
        pdfDocument.save(outputFile, PDFSaveFullOptions.newInstance());
        System.out.println("Created: " + outputFileName);       
    }
    
    
}