Redaction
Redact PDFs - PDFRedact
Sample code for using Apryse SDK to remove potentially sensitive content within PDF documents. Using 'pdftron.PDF.Redactor' makes sure that if a portion of an image, text, or vector graphics is contained in a redaction region, that portion is destroyed and is not simply hidden with clipping or image masks. Sample code provided in Python, C++, C#, Java, Node.js (JavaScript), PHP, Ruby and VB.
Implementation steps
To redact files with Apryse Server SDK:
Step 1: Follow get started with Server SDK in your preferred language or framework Step 2: Add the sample code provided in this guide
To use this feature in production, your license key will need the Redaction Package. Trial keys already include all packages.
Learn more about our Server SDK.
//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2024 by Apryse Software Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------
using System;
using System.IO;
using System.Collections;
using pdftron;
using pdftron.Common;
using pdftron.Filters;
using pdftron.SDF;
using pdftron.PDF;
namespace PDFNetSamples
{
// PDF Redactor is a separately licensable Add-on that offers options to remove
// (not just covering or obscuring) content within a region of PDF.
// With printed pages, redaction involves blacking-out or cutting-out areas of
// the printed page. With electronic documents that use formats such as PDF,
// redaction typically involves removing sensitive content within documents for
// safe distribution to courts, patent and government institutions, the media,
// customers, vendors or any other audience with restricted access to the content.
//
// The redaction process in PDFNet consists of two steps:
//
// a) Content identification: A user applies redact annotations that specify the
// pieces or regions of content that should be removed. The content for redaction
// can be identified either interactively (e.g. using 'pdftron.PDF.PDFViewCtrl'
// as shown in PDFView sample) or programmatically (e.g. using 'pdftron.PDF.TextSearch'
// or 'pdftron.PDF.TextExtractor'). Up until the next step is performed, the user
// can see, move and redefine these annotations.
// b) Content removal: Using 'pdftron.PDF.Redactor.Redact()' the user instructs
// PDFNet to apply the redact regions, after which the content in the area specified
// by the redact annotations is removed. The redaction function includes number of
// options to control the style of the redaction overlay (including color, text,
// font, border, transparency, etc.).
//
// PDFTron Redactor makes sure that if a portion of an image, text, or vector graphics
// is contained in a redaction region, that portion of the image or path data is
// destroyed and is not simply hidden with clipping or image masks. PDFNet API can also
// be used to review and remove metadata and other content that can exist in a PDF
// document, including XML Forms Architecture (XFA) content and Extensible Metadata
// Platform (XMP) content.
class Class1
{
private static pdftron.PDFNetLoader pdfNetLoader = pdftron.PDFNetLoader.Instance();
static Class1() {}
static void Redact(string input, string output, ArrayList rarr, Redactor.Appearance app)
{
using (PDFDoc doc = new PDFDoc(input))
{
doc.InitSecurityHandler();
Redactor.Redact(doc, rarr, app, false, true);
doc.Save(output, SDFDoc.SaveOptions.e_linearized);
}
}
/// <summary>
/// The following sample illustrates how to redact a PDF document using 'pdftron.PDF.Redactor'.
/// </summary>
static void Main(string[] args)
{
PDFNet.Initialize(PDFTronLicense.Key);
string input_path = "../../../../TestFiles/";
string output_path = "../../../../TestFiles/Output/";
try
{
ArrayList rarr = new ArrayList();
rarr.Add(new Redactor.Redaction(1, new Rect(100, 100, 550, 600), false, "Top Secret"));
rarr.Add(new Redactor.Redaction(2, new Rect(30, 30, 450, 450), true, "Negative Redaction"));
rarr.Add(new Redactor.Redaction(2, new Rect(0, 0, 100, 100), false, "Positive"));
rarr.Add(new Redactor.Redaction(2, new Rect(100, 100, 200, 200), false, "Positive"));
rarr.Add(new Redactor.Redaction(2, new Rect(300, 300, 400, 400), false, ""));
rarr.Add(new Redactor.Redaction(2, new Rect(500, 500, 600, 600), false, ""));
rarr.Add(new Redactor.Redaction(3, new Rect(0, 0, 700, 20), false, ""));
Redactor.Appearance app = new Redactor.Appearance();
app.RedactionOverlay = true;
app.Border = false;
app.ShowRedactedContentRegions = true;
Redact(input_path + "newsletter.pdf", output_path + "redacted.pdf", rarr, app);
Console.WriteLine("Done...");
}
catch (PDFNetException e)
{
Console.WriteLine(e.Message);
}
PDFNet.Terminate();
}
}
}