PDF Redaction in C#: Remove Sensitive Data and Sanitize Documents with IronPDF

using IronPdf;

// Load the source document
PdfDocument pdf = PdfDocument.FromFile("employee-records.pdf");

// Redact an employee name from the entire document
pdf.RedactTextOnAllPages("John Smith");

// Redact a Social Security Number
pdf.RedactTextOnAllPages("123-45-6789");

// Redact an internal employee ID
pdf.RedactTextOnAllPages("EMP-2024-0042");

// Save the cleaned document
pdf.SaveAs("employee-records-redacted.pdf");

Imports IronPdf

' Load the source document
Dim pdf As PdfDocument = PdfDocument.FromFile("employee-records.pdf")

' Redact an employee name from the entire document
pdf.RedactTextOnAllPages("John Smith")

' Redact a Social Security Number
pdf.RedactTextOnAllPages("123-45-6789")

' Redact an internal employee ID
pdf.RedactTextOnAllPages("EMP-2024-0042")

' Save the cleaned document
pdf.SaveAs("employee-records-redacted.pdf")

using IronPdf;
using System.Collections.Generic;

// Load the document once
PdfDocument pdf = PdfDocument.FromFile("quarterly-report.pdf");

// Define all terms that need redaction
List<string> sensitiveTerms = new List<string>
{
    "Project Titan",
    "Sarah Johnson",
    "Budget: $4.2M",
    "Q3-INTERNAL-2024",
    "sarah.johnson@company.com"
};

// Redact each term
foreach (string term in sensitiveTerms)
{
    pdf.RedactTextOnAllPages(term);
}

// Save the result
pdf.SaveAs("quarterly-report-public.pdf");

Imports IronPdf
Imports System.Collections.Generic

' Load the document once
Dim pdf As PdfDocument = PdfDocument.FromFile("quarterly-report.pdf")

' Define all terms that need redaction
Dim sensitiveTerms As New List(Of String) From {
    "Project Titan",
    "Sarah Johnson",
    "Budget: $4.2M",
    "Q3-INTERNAL-2024",
    "sarah.johnson@company.com"
}

' Redact each term
For Each term As String In sensitiveTerms
    pdf.RedactTextOnAllPages(term)
Next

' Save the result
pdf.SaveAs("quarterly-report-public.pdf")

using IronPdf;

// Load the document
PdfDocument pdf = PdfDocument.FromFile("contract-bundle.pdf");

// Redact text only on page 1 (index 0)
pdf.RedactTextOnPage(0, "Client Name: Acme Corporation");

// Redact text on pages 3, 5, and 7 (indices 2, 4, 6)
int[] financialPages = { 2, 4, 6 };
pdf.RedactTextOnPages(financialPages, "Payment Terms: Net 30");

// Other pages remain untouched except for the specific redactions applied

pdf.SaveAs("contract-bundle-redacted.pdf");

Imports IronPdf

' Load the document
Dim pdf As PdfDocument = PdfDocument.FromFile("contract-bundle.pdf")

' Redact text only on page 1 (index 0)
pdf.RedactTextOnPage(0, "Client Name: Acme Corporation")

' Redact text on pages 3, 5, and 7 (indices 2, 4, 6)
Dim financialPages As Integer() = {2, 4, 6}
pdf.RedactTextOnPages(financialPages, "Payment Terms: Net 30")

' Other pages remain untouched except for the specific redactions applied

pdf.SaveAs("contract-bundle-redacted.pdf")

using IronPdf;

// Process a large document efficiently
PdfDocument pdf = PdfDocument.FromFile("annual-report-500-pages.pdf");

// We know from document structure that:
// - Executive summary with names is on pages 1-3
// - Financial data is on pages 45-60
// - Appendix with employee info is on pages 480-495

// Redact executive names from summary section
for (int i = 0; i <= 2; i++)
{
    pdf.RedactTextOnPage(i, "CEO: Robert Williams");
    pdf.RedactTextOnPage(i, "CFO: Maria Garcia");
}

// Redact specific financial figures from the financial section
int[] financialSection = { 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59 };
pdf.RedactTextOnPages(financialSection, "Net Revenue: $847M");

// Redact employee identifiers from appendix
for (int i = 479; i <= 494; i++)
{
    pdf.RedactTextOnPage(i, "Employee ID:");
}

pdf.SaveAs("annual-report-public-release.pdf");

Imports IronPdf

' Process a large document efficiently
Dim pdf As PdfDocument = PdfDocument.FromFile("annual-report-500-pages.pdf")

' We know from document structure that:
' - Executive summary with names is on pages 1-3
' - Financial data is on pages 45-60
' - Appendix with employee info is on pages 480-495

' Redact executive names from summary section
For i As Integer = 0 To 2
    pdf.RedactTextOnPage(i, "CEO: Robert Williams")
    pdf.RedactTextOnPage(i, "CFO: Maria Garcia")
Next

' Redact specific financial figures from the financial section
Dim financialSection As Integer() = {44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59}
pdf.RedactTextOnPages(financialSection, "Net Revenue: $847M")

' Redact employee identifiers from appendix
For i As Integer = 479 To 494
    pdf.RedactTextOnPage(i, "Employee ID:")
Next

pdf.SaveAs("annual-report-public-release.pdf")

using IronPdf;

// Load the document
PdfDocument pdf = PdfDocument.FromFile("legal-brief.pdf");

// Case-sensitive redaction: only matches exact case
// "CLASSIFIED" will be redacted but "classified" or "Classified" will not
pdf.RedactTextOnAllPages(
    "CLASSIFIED",
    CaseSensitive: true,
    OnlyMatchWholeWords: true,
    DrawRectangles: true,
    ReplacementText: "[REDACTED]"
);

// Case-insensitive redaction: matches regardless of case
// Will redact "Secret", "SECRET", "secret", etc.
pdf.RedactTextOnAllPages(
    "secret",
    CaseSensitive: false,
    OnlyMatchWholeWords: true,
    DrawRectangles: true,
    ReplacementText: "*****"
);

// Whole word disabled: matches partial strings too
// Will redact "password", "passwords", "mypassword123", etc.
pdf.RedactTextOnAllPages(
    "password",
    CaseSensitive: false,
    OnlyMatchWholeWords: false,
    DrawRectangles: true,
    ReplacementText: "XXXXX"
);

// No visual rectangle: text is removed but no black box appears
// Useful when you want seamless removal without obvious redaction marks
pdf.RedactTextOnAllPages(
    "internal-reference-code",
    CaseSensitive: true,
    OnlyMatchWholeWords: true,
    DrawRectangles: false,
    ReplacementText: ""
);

pdf.SaveAs("legal-brief-redacted.pdf");

Imports IronPdf

' Load the document
Dim pdf As PdfDocument = PdfDocument.FromFile("legal-brief.pdf")

' Case-sensitive redaction: only matches exact case
' "CLASSIFIED" will be redacted but "classified" or "Classified" will not
pdf.RedactTextOnAllPages(
    "CLASSIFIED",
    CaseSensitive:=True,
    OnlyMatchWholeWords:=True,
    DrawRectangles:=True,
    ReplacementText:="[REDACTED]"
)

' Case-insensitive redaction: matches regardless of case
' Will redact "Secret", "SECRET", "secret", etc.
pdf.RedactTextOnAllPages(
    "secret",
    CaseSensitive:=False,
    OnlyMatchWholeWords:=True,
    DrawRectangles:=True,
    ReplacementText:="*****"
)

' Whole word disabled: matches partial strings too
' Will redact "password", "passwords", "mypassword123", etc.
pdf.RedactTextOnAllPages(
    "password",
    CaseSensitive:=False,
    OnlyMatchWholeWords:=False,
    DrawRectangles:=True,
    ReplacementText:="XXXXX"
)

' No visual rectangle: text is removed but no black box appears
' Useful when you want seamless removal without obvious redaction marks
pdf.RedactTextOnAllPages(
    "internal-reference-code",
    CaseSensitive:=True,
    OnlyMatchWholeWords:=True,
    DrawRectangles:=False,
    ReplacementText:=""
)

pdf.SaveAs("legal-brief-redacted.pdf")

using IronPdf;
using IronSoftware.Drawing;

// Load a document with signature blocks and photos
PdfDocument pdf = PdfDocument.FromFile("signed-agreement.pdf");

// Define a region for a signature block
// Located 100 points from left, 650 points from bottom
// Width of 200 points, height of 50 points
RectangleF signatureRegion = new RectangleF(100, 650, 200, 50);

// Redact the signature region on all pages
pdf.RedactRegionsOnAllPages(signatureRegion);

// Define a region for a photo ID in the upper right
RectangleF photoRegion = new RectangleF(450, 700, 100, 120);
pdf.RedactRegionsOnAllPages(photoRegion);

// Save the document with regions redacted
pdf.SaveAs("signed-agreement-redacted.pdf");

Imports IronPdf
Imports IronSoftware.Drawing

' Load a document with signature blocks and photos
Dim pdf As PdfDocument = PdfDocument.FromFile("signed-agreement.pdf")

' Define a region for a signature block
' Located 100 points from left, 650 points from bottom
' Width of 200 points, height of 50 points
Dim signatureRegion As New RectangleF(100, 650, 200, 50)

' Redact the signature region on all pages
pdf.RedactRegionsOnAllPages(signatureRegion)

' Define a region for a photo ID in the upper right
Dim photoRegion As New RectangleF(450, 700, 100, 120)
pdf.RedactRegionsOnAllPages(photoRegion)

' Save the document with regions redacted
pdf.SaveAs("signed-agreement-redacted.pdf")

using IronPdf;
using IronSoftware.Drawing;

PdfDocument pdf = PdfDocument.FromFile("form-document.pdf");

// Get dimensions of the first page
var pageInfo = pdf.Pages[0];

// Calculate regions relative to page dimensions
// Redact the bottom quarter of the page where signatures appear
float signatureAreaHeight = (float)(pageInfo.Height / 4);
RectangleF bottomQuarter = new RectangleF(
    0,                              // Start at left edge
    0,                              // Start at bottom
    (float)pageInfo.Width,          // Full page width
    signatureAreaHeight             // Quarter of page height
);

pdf.RedactRegionsOnAllPages(bottomQuarter);

// Redact a header area at the top containing letterhead with address
float headerHeight = 100;
RectangleF headerArea = new RectangleF(
    0,
    (float)(pageInfo.Height - headerHeight), // Position from bottom
    (float)pageInfo.Width,
    headerHeight
);

pdf.RedactRegionsOnAllPages(headerArea);

pdf.SaveAs("form-document-redacted.pdf");

Imports IronPdf
Imports IronSoftware.Drawing

Dim pdf As PdfDocument = PdfDocument.FromFile("form-document.pdf")

' Get dimensions of the first page
Dim pageInfo = pdf.Pages(0)

' Calculate regions relative to page dimensions
' Redact the bottom quarter of the page where signatures appear
Dim signatureAreaHeight As Single = CSng(pageInfo.Height / 4)
Dim bottomQuarter As New RectangleF(0, 0, CSng(pageInfo.Width), signatureAreaHeight)

pdf.RedactRegionsOnAllPages(bottomQuarter)

' Redact a header area at the top containing letterhead with address
Dim headerHeight As Single = 100
Dim headerArea As New RectangleF(0, CSng(pageInfo.Height - headerHeight), CSng(pageInfo.Width), headerHeight)

pdf.RedactRegionsOnAllPages(headerArea)

pdf.SaveAs("form-document-redacted.pdf")

using IronPdf;
using System;

// Load a document containing sensitive metadata
PdfDocument pdf = PdfDocument.FromFile("internal-report.pdf");

// Access current metadata properties
string author = pdf.MetaData.Author;
string title = pdf.MetaData.Title;
string subject = pdf.MetaData.Subject;
string keywords = pdf.MetaData.Keywords;
string creator = pdf.MetaData.Creator;
string producer = pdf.MetaData.Producer;
DateTime? creationDate = pdf.MetaData.CreationDate;
DateTime? modifiedDate = pdf.MetaData.ModifiedDate;

// Get all metadata keys including custom properties
var allKeys = pdf.MetaData.Keys();

Imports IronPdf
Imports System

' Load a document containing sensitive metadata
Dim pdf As PdfDocument = PdfDocument.FromFile("internal-report.pdf")

' Access current metadata properties
Dim author As String = pdf.MetaData.Author
Dim title As String = pdf.MetaData.Title
Dim subject As String = pdf.MetaData.Subject
Dim keywords As String = pdf.MetaData.Keywords
Dim creator As String = pdf.MetaData.Creator
Dim producer As String = pdf.MetaData.Producer
Dim creationDate As DateTime? = pdf.MetaData.CreationDate
Dim modifiedDate As DateTime? = pdf.MetaData.ModifiedDate

' Get all metadata keys including custom properties
Dim allKeys = pdf.MetaData.Keys()

using IronPdf;
using System;

PdfDocument pdf = PdfDocument.FromFile("confidential-memo.pdf");

// Replace identifying metadata with generic values
pdf.MetaData.Author = "Organization Name";
pdf.MetaData.Creator = "Document System";
pdf.MetaData.Producer = "";
pdf.MetaData.Title = "Public Document";
pdf.MetaData.Subject = "";
pdf.MetaData.Keywords = "";

// Normalize dates to remove timing information
pdf.MetaData.CreationDate = DateTime.Now;
pdf.MetaData.ModifiedDate = DateTime.Now;

// Remove specific custom metadata keys
pdf.MetaData.RemoveMetaDataKey("OriginalFilename");
pdf.MetaData.RemoveMetaDataKey("LastSavedBy");
pdf.MetaData.RemoveMetaDataKey("Company");
pdf.MetaData.RemoveMetaDataKey("Manager");

// Remove custom properties added by applications
try
{
    pdf.MetaData.CustomProperties.Remove("SourcePath");
}
catch { }

pdf.SaveAs("confidential-memo-cleaned.pdf");

Imports IronPdf
Imports System

Dim pdf As PdfDocument = PdfDocument.FromFile("confidential-memo.pdf")

' Replace identifying metadata with generic values
pdf.MetaData.Author = "Organization Name"
pdf.MetaData.Creator = "Document System"
pdf.MetaData.Producer = ""
pdf.MetaData.Title = "Public Document"
pdf.MetaData.Subject = ""
pdf.MetaData.Keywords = ""

' Normalize dates to remove timing information
pdf.MetaData.CreationDate = DateTime.Now
pdf.MetaData.ModifiedDate = DateTime.Now

' Remove specific custom metadata keys
pdf.MetaData.RemoveMetaDataKey("OriginalFilename")
pdf.MetaData.RemoveMetaDataKey("LastSavedBy")
pdf.MetaData.RemoveMetaDataKey("Company")
pdf.MetaData.RemoveMetaDataKey("Manager")

' Remove custom properties added by applications
Try
    pdf.MetaData.CustomProperties.Remove("SourcePath")
Catch
End Try

pdf.SaveAs("confidential-memo-cleaned.pdf")

using IronPdf;
using System;
using System.Collections.Generic;

public class MetadataCleaner
{
    private readonly string _defaultAuthor;
    private readonly string _defaultCreator;

    public MetadataCleaner(string organizationName)
    {
        _defaultAuthor = organizationName;
        _defaultCreator = $"{organizationName} Document System";
    }

    public void CleanMetadata(PdfDocument pdf)
    {
        // Replace standard metadata fields
        pdf.MetaData.Author = _defaultAuthor;
        pdf.MetaData.Creator = _defaultCreator;
        pdf.MetaData.Producer = "";
        pdf.MetaData.Subject = "";
        pdf.MetaData.Keywords = "";

        // Normalize timestamps
        DateTime now = DateTime.Now;
        pdf.MetaData.CreationDate = now;
        pdf.MetaData.ModifiedDate = now;

        // Get all keys and remove potentially sensitive ones
        List<string> keysToRemove = new List<string>();
        foreach (string key in pdf.MetaData.Keys())
        {
            // Keep only essential keys
            if (!IsEssentialKey(key))
            {
                keysToRemove.Add(key);
            }
        }

        foreach (string key in keysToRemove)
        {
            pdf.MetaData.RemoveMetaDataKey(key);
        }
    }

    private bool IsEssentialKey(string key)
    {
        // Keep only the basic display properties
        string[] essentialKeys = { "Title", "Author", "CreationDate", "ModifiedDate" };
        foreach (string essential in essentialKeys)
        {
            if (key.Equals(essential, StringComparison.OrdinalIgnoreCase))
            {
                return true;
            }
        }
        return false;
    }
}

// Usage
class Program
{
    static void Main()
    {
        MetadataCleaner cleaner = new MetadataCleaner("Acme Corporation");

        PdfDocument pdf = PdfDocument.FromFile("report.pdf");
        cleaner.CleanMetadata(pdf);
        pdf.SaveAs("report-clean.pdf");
    }
}

Imports IronPdf
Imports System
Imports System.Collections.Generic

Public Class MetadataCleaner
    Private ReadOnly _defaultAuthor As String
    Private ReadOnly _defaultCreator As String

    Public Sub New(organizationName As String)
        _defaultAuthor = organizationName
        _defaultCreator = $"{organizationName} Document System"
    End Sub

    Public Sub CleanMetadata(pdf As PdfDocument)
        ' Replace standard metadata fields
        pdf.MetaData.Author = _defaultAuthor
        pdf.MetaData.Creator = _defaultCreator
        pdf.MetaData.Producer = ""
        pdf.MetaData.Subject = ""
        pdf.MetaData.Keywords = ""

        ' Normalize timestamps
        Dim now As DateTime = DateTime.Now
        pdf.MetaData.CreationDate = now
        pdf.MetaData.ModifiedDate = now

        ' Get all keys and remove potentially sensitive ones
        Dim keysToRemove As New List(Of String)()
        For Each key As String In pdf.MetaData.Keys()
            ' Keep only essential keys
            If Not IsEssentialKey(key) Then
                keysToRemove.Add(key)
            End If
        Next

        For Each key As String In keysToRemove
            pdf.MetaData.RemoveMetaDataKey(key)
        Next
    End Sub

    Private Function IsEssentialKey(key As String) As Boolean
        ' Keep only the basic display properties
        Dim essentialKeys As String() = {"Title", "Author", "CreationDate", "ModifiedDate"}
        For Each essential As String In essentialKeys
            If key.Equals(essential, StringComparison.OrdinalIgnoreCase) Then
                Return True
            End If
        Next
        Return False
    End Function
End Class

' Usage
Class Program
    Shared Sub Main()
        Dim cleaner As New MetadataCleaner("Acme Corporation")

        Dim pdf As PdfDocument = PdfDocument.FromFile("report.pdf")
        cleaner.CleanMetadata(pdf)
        pdf.SaveAs("report-clean.pdf")
    End Sub
End Class

using IronPdf;

// Load a PDF that may contain active content
PdfDocument pdf = PdfDocument.FromFile("received-document.pdf");

// Sanitize using SVG conversion
// Faster processing, results in searchable text, slight layout variations possible
PdfDocument sanitizedSvg = Cleaner.SanitizeWithSvg(pdf);
sanitizedSvg.SaveAs("sanitized-svg.pdf");

// Sanitize using Bitmap conversion
// Slower processing, text becomes image (not searchable), exact visual reproduction
PdfDocument sanitizedBitmap = Cleaner.SanitizeWithBitmap(pdf);
sanitizedBitmap.SaveAs("sanitized-bitmap.pdf");

Imports IronPdf

' Load a PDF that may contain active content
Dim pdf As PdfDocument = PdfDocument.FromFile("received-document.pdf")

' Sanitize using SVG conversion
' Faster processing, results in searchable text, slight layout variations possible
Dim sanitizedSvg As PdfDocument = Cleaner.SanitizeWithSvg(pdf)
sanitizedSvg.SaveAs("sanitized-svg.pdf")

' Sanitize using Bitmap conversion
' Slower processing, text becomes image (not searchable), exact visual reproduction
Dim sanitizedBitmap As PdfDocument = Cleaner.SanitizeWithBitmap(pdf)
sanitizedBitmap.SaveAs("sanitized-bitmap.pdf")

using IronPdf;

// Load the potentially unsafe document
PdfDocument pdf = PdfDocument.FromFile("untrusted-source.pdf");

// Configure rendering options for sanitization
var renderOptions = new ChromePdfRenderOptions
{
    MarginTop = 10,
    MarginBottom = 10,
    MarginLeft = 10,
    MarginRight = 10
};

// Sanitize with custom options
PdfDocument sanitized = Cleaner.SanitizeWithSvg(pdf, renderOptions);
sanitized.SaveAs("untrusted-source-safe.pdf");

Imports IronPdf

' Load the potentially unsafe document
Dim pdf As PdfDocument = PdfDocument.FromFile("untrusted-source.pdf")

' Configure rendering options for sanitization
Dim renderOptions As New ChromePdfRenderOptions With {
    .MarginTop = 10,
    .MarginBottom = 10,
    .MarginLeft = 10,
    .MarginRight = 10
}

' Sanitize with custom options
Dim sanitized As PdfDocument = Cleaner.SanitizeWithSvg(pdf, renderOptions)
sanitized.SaveAs("untrusted-source-safe.pdf")

using IronPdf;
using System;

public class SecureDocumentProcessor
{
    public PdfDocument ProcessUntrustedDocument(string inputPath)
    {
        // Load the document
        PdfDocument original = PdfDocument.FromFile(inputPath);

        // Step 1: Sanitize to remove active content
        PdfDocument sanitized = Cleaner.SanitizeWithSvg(original);

        // Step 2: Clean metadata
        sanitized.MetaData.Author = "Processed Document";
        sanitized.MetaData.Creator = "Secure Processor";
        sanitized.MetaData.Producer = "";
        sanitized.MetaData.CreationDate = DateTime.Now;
        sanitized.MetaData.ModifiedDate = DateTime.Now;

        // Remove all custom metadata
        foreach (string key in sanitized.MetaData.Keys())
        {
            if (key != "Title" && key != "Author" && key != "CreationDate" && key != "ModifiedDate")
            {
                sanitized.MetaData.RemoveMetaDataKey(key);
            }
        }

        return sanitized;
    }
}

// Usage
class Program
{
    static void Main()
    {
        SecureDocumentProcessor processor = new SecureDocumentProcessor();
        PdfDocument safe = processor.ProcessUntrustedDocument("email-attachment.pdf");
        safe.SaveAs("email-attachment-safe.pdf");
    }
}

Imports IronPdf
Imports System

Public Class SecureDocumentProcessor
    Public Function ProcessUntrustedDocument(inputPath As String) As PdfDocument
        ' Load the document
        Dim original As PdfDocument = PdfDocument.FromFile(inputPath)

        ' Step 1: Sanitize to remove active content
        Dim sanitized As PdfDocument = Cleaner.SanitizeWithSvg(original)

        ' Step 2: Clean metadata
        sanitized.MetaData.Author = "Processed Document"
        sanitized.MetaData.Creator = "Secure Processor"
        sanitized.MetaData.Producer = ""
        sanitized.MetaData.CreationDate = DateTime.Now
        sanitized.MetaData.ModifiedDate = DateTime.Now

        ' Remove all custom metadata
        For Each key As String In sanitized.MetaData.Keys()
            If key <> "Title" AndAlso key <> "Author" AndAlso key <> "CreationDate" AndAlso key <> "ModifiedDate" Then
                sanitized.MetaData.RemoveMetaDataKey(key)
            End If
        Next

        Return sanitized
    End Function
End Class

' Usage
Module Program
    Sub Main()
        Dim processor As New SecureDocumentProcessor()
        Dim safe As PdfDocument = processor.ProcessUntrustedDocument("email-attachment.pdf")
        safe.SaveAs("email-attachment-safe.pdf")
    End Sub
End Module

using IronPdf;
using IronSoftware.Drawing;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;

public class DocumentProcessingResult
{
    public string OriginalFile { get; set; }
    public string OutputFile { get; set; }
    public bool WasSanitized { get; set; }
    public int TextRedactionsApplied { get; set; }
    public int RegionRedactionsApplied { get; set; }
    public bool MetadataCleaned { get; set; }
    public List<string> SensitiveDataTypesFound { get; set; } = new List<string>();
    public DateTime ProcessedAt { get; set; }
    public bool Success { get; set; }
    public string ErrorMessage { get; set; }
}

public class ComprehensiveDocumentProcessor
{
    // Sensitive data patterns
    private readonly Dictionary<string, string> _sensitivePatterns = new Dictionary<string, string>
    {
        { "SSN", @"\b\d{3}-\d{2}-\d{4}\b" },
        { "Credit Card", @"\b(?:\d{4}[-\s]?){3}\d{1,4}\b" },
        { "Email", @"\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b" },
        { "Phone", @"\b(?:\(\d{3}\)\s?|\d{3}[-.])\d{3}[-.]?\d{4}\b" }
    };

    // Standard regions to redact (signature areas, photo locations)
    private readonly List<RectangleF> _standardRedactionRegions = new List<RectangleF>
    {
        new RectangleF(72, 72, 200, 50),    // Bottom left signature
        new RectangleF(350, 72, 200, 50)    // Bottom right signature
    };

    private readonly string _organizationName;

    public ComprehensiveDocumentProcessor(string organizationName)
    {
        _organizationName = organizationName;
    }

    public DocumentProcessingResult ProcessDocument(
        string inputPath,
        string outputPath,
        bool sanitize = true,
        bool redactPatterns = true,
        bool redactRegions = true,
        bool cleanMetadata = true,
        List<string> additionalTermsToRedact = null)
    {
        var result = new DocumentProcessingResult
        {
            OriginalFile = inputPath,
            OutputFile = outputPath,
            ProcessedAt = DateTime.Now
        };

        try
        {
            // Load the document
            PdfDocument pdf = PdfDocument.FromFile(inputPath);

            // Step 1: Security scan
            CleanerScanResult scanResult = Cleaner.ScanPdf(pdf);

            if (scanResult.IsDetected && scanResult.Risks.Count > 10)
            {
                throw new SecurityException("Document contains too many security risks to process");
            }

            // Step 2: Sanitization (if needed or requested)
            if (sanitize || scanResult.IsDetected)
            {
                pdf = Cleaner.SanitizeWithSvg(pdf);
                result.WasSanitized = true;
            }

            // Step 3: Pattern-based text redaction
            if (redactPatterns)
            {
                string fullText = pdf.ExtractAllText();
                HashSet<string> valuesToRedact = new HashSet<string>();

                foreach (var pattern in _sensitivePatterns)
                {
                    Regex regex = new Regex(pattern.Value, RegexOptions.IgnoreCase);
                    MatchCollection matches = regex.Matches(fullText);

                    if (matches.Count > 0)
                    {
                        result.SensitiveDataTypesFound.Add($"{pattern.Key} ({matches.Count})");
                        foreach (Match match in matches)
                        {
                            valuesToRedact.Add(match.Value);
                        }
                    }
                }

                // Apply redactions
                foreach (string value in valuesToRedact)
                {
                    pdf.RedactTextOnAllPages(value);
                    result.TextRedactionsApplied++;
                }
            }

            // Step 4: Additional specific terms
            if (additionalTermsToRedact != null)
            {
                foreach (string term in additionalTermsToRedact)
                {
                    pdf.RedactTextOnAllPages(term);
                    result.TextRedactionsApplied++;
                }
            }

            // Step 5: Region-based redaction
            if (redactRegions)
            {
                foreach (RectangleF region in _standardRedactionRegions)
                {
                    pdf.RedactRegionsOnAllPages(region);
                    result.RegionRedactionsApplied++;
                }
            }

            // Step 6: Metadata cleaning
            if (cleanMetadata)
            {
                pdf.MetaData.Author = _organizationName;
                pdf.MetaData.Creator = $"{_organizationName} Document Processor";
                pdf.MetaData.Producer = "";
                pdf.MetaData.Subject = "";
                pdf.MetaData.Keywords = "";
                pdf.MetaData.CreationDate = DateTime.Now;
                pdf.MetaData.ModifiedDate = DateTime.Now;
                result.MetadataCleaned = true;
            }

            // Step 7: Save the processed document
            pdf.SaveAs(outputPath);
            result.Success = true;
        }
        catch (Exception ex)
        {
            result.Success = false;
            result.ErrorMessage = ex.Message;
        }

        return result;
    }
}

// Usage example
class Program
{
    static void Main()
    {
        var processor = new ComprehensiveDocumentProcessor("Acme Corporation");

        // Process a single document with all protections
        var result = processor.ProcessDocument(
            inputPath: "customer-application.pdf",
            outputPath: "customer-application-redacted.pdf",
            sanitize: true,
            redactPatterns: true,
            redactRegions: true,
            cleanMetadata: true,
            additionalTermsToRedact: new List<string> { "Project Alpha", "Internal Use Only" }
        );

        // Batch process multiple documents
        string[] inputFiles = Directory.GetFiles("incoming", "*.pdf");
        foreach (string file in inputFiles)
        {
            string outputFile = Path.Combine("processed", Path.GetFileName(file));
            processor.ProcessDocument(file, outputFile);
        }
    }
}

Imports IronPdf
Imports IronSoftware.Drawing
Imports System
Imports System.Collections.Generic
Imports System.IO
Imports System.Text.RegularExpressions

Public Class DocumentProcessingResult
    Public Property OriginalFile As String
    Public Property OutputFile As String
    Public Property WasSanitized As Boolean
    Public Property TextRedactionsApplied As Integer
    Public Property RegionRedactionsApplied As Integer
    Public Property MetadataCleaned As Boolean
    Public Property SensitiveDataTypesFound As List(Of String) = New List(Of String)()
    Public Property ProcessedAt As DateTime
    Public Property Success As Boolean
    Public Property ErrorMessage As String
End Class

Public Class ComprehensiveDocumentProcessor
    ' Sensitive data patterns
    Private ReadOnly _sensitivePatterns As Dictionary(Of String, String) = New Dictionary(Of String, String) From {
        {"SSN", "\b\d{3}-\d{2}-\d{4}\b"},
        {"Credit Card", "\b(?:\d{4}[-\s]?){3}\d{1,4}\b"},
        {"Email", "\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b"},
        {"Phone", "\b(?:\(\d{3}\)\s?|\d{3}[-.])\d{3}[-.]?\d{4}\b"}
    }

    ' Standard regions to redact (signature areas, photo locations)
    Private ReadOnly _standardRedactionRegions As List(Of RectangleF) = New List(Of RectangleF) From {
        New RectangleF(72, 72, 200, 50),    ' Bottom left signature
        New RectangleF(350, 72, 200, 50)    ' Bottom right signature
    }

    Private ReadOnly _organizationName As String

    Public Sub New(organizationName As String)
        _organizationName = organizationName
    End Sub

    Public Function ProcessDocument(
        inputPath As String,
        outputPath As String,
        Optional sanitize As Boolean = True,
        Optional redactPatterns As Boolean = True,
        Optional redactRegions As Boolean = True,
        Optional cleanMetadata As Boolean = True,
        Optional additionalTermsToRedact As List(Of String) = Nothing) As DocumentProcessingResult

        Dim result As New DocumentProcessingResult With {
            .OriginalFile = inputPath,
            .OutputFile = outputPath,
            .ProcessedAt = DateTime.Now
        }

        Try
            ' Load the document
            Dim pdf As PdfDocument = PdfDocument.FromFile(inputPath)

            ' Step 1: Security scan
            Dim scanResult As CleanerScanResult = Cleaner.ScanPdf(pdf)

            If scanResult.IsDetected AndAlso scanResult.Risks.Count > 10 Then
                Throw New SecurityException("Document contains too many security risks to process")
            End If

            ' Step 2: Sanitization (if needed or requested)
            If sanitize OrElse scanResult.IsDetected Then
                pdf = Cleaner.SanitizeWithSvg(pdf)
                result.WasSanitized = True
            End If

            ' Step 3: Pattern-based text redaction
            If redactPatterns Then
                Dim fullText As String = pdf.ExtractAllText()
                Dim valuesToRedact As New HashSet(Of String)()

                For Each pattern In _sensitivePatterns
                    Dim regex As New Regex(pattern.Value, RegexOptions.IgnoreCase)
                    Dim matches As MatchCollection = regex.Matches(fullText)

                    If matches.Count > 0 Then
                        result.SensitiveDataTypesFound.Add($"{pattern.Key} ({matches.Count})")
                        For Each match As Match In matches
                            valuesToRedact.Add(match.Value)
                        Next
                    End If
                Next

                ' Apply redactions
                For Each value As String In valuesToRedact
                    pdf.RedactTextOnAllPages(value)
                    result.TextRedactionsApplied += 1
                Next
            End If

            ' Step 4: Additional specific terms
            If additionalTermsToRedact IsNot Nothing Then
                For Each term As String In additionalTermsToRedact
                    pdf.RedactTextOnAllPages(term)
                    result.TextRedactionsApplied += 1
                Next
            End If

            ' Step 5: Region-based redaction
            If redactRegions Then
                For Each region As RectangleF In _standardRedactionRegions
                    pdf.RedactRegionsOnAllPages(region)
                    result.RegionRedactionsApplied += 1
                Next
            End If

            ' Step 6: Metadata cleaning
            If cleanMetadata Then
                pdf.MetaData.Author = _organizationName
                pdf.MetaData.Creator = $"{_organizationName} Document Processor"
                pdf.MetaData.Producer = ""
                pdf.MetaData.Subject = ""
                pdf.MetaData.Keywords = ""
                pdf.MetaData.CreationDate = DateTime.Now
                pdf.MetaData.ModifiedDate = DateTime.Now
                result.MetadataCleaned = True
            End If

            ' Step 7: Save the processed document
            pdf.SaveAs(outputPath)
            result.Success = True
        Catch ex As Exception
            result.Success = False
            result.ErrorMessage = ex.Message
        End Try

        Return result
    End Function
End Class

' Usage example
Class Program
    Shared Sub Main()
        Dim processor As New ComprehensiveDocumentProcessor("Acme Corporation")

        ' Process a single document with all protections
        Dim result = processor.ProcessDocument(
            inputPath:="customer-application.pdf",
            outputPath:="customer-application-redacted.pdf",
            sanitize:=True,
            redactPatterns:=True,
            redactRegions:=True,
            cleanMetadata:=True,
            additionalTermsToRedact:=New List(Of String) From {"Project Alpha", "Internal Use Only"}
        )

        ' Batch process multiple documents
        Dim inputFiles As String() = Directory.GetFiles("incoming", "*.pdf")
        For Each file As String In inputFiles
            Dim outputFile As String = Path.Combine("processed", Path.GetFileName(file))
            processor.ProcessDocument(file, outputFile)
        Next
    End Sub
End Class