How to use Security Options and Encryption for Documents in C# and .NET

  1. Add SautinSoft.Document from Nuget.
  2. Load/Create a document.
  3. Specify a password, encryption type and permissions in pdf save options.
  4. Save the document as PDF.

First of all, let's create a simple document with inscription: "Hello World" and Save a document as the PDF file with Security Options:


               // Let's create a simple inscription.
            dc.Content.End.Insert("Hello World!!!", new CharacterFormat() { FontName = "Verdana", Size = 65.5f, FontColor = Color.Orange });
The next step is adding: Password Protection, EncryptionAlgorithm, Permissions 
so.EncryptionDetails.UserPassword = "12345";
so.EncryptionDetails.EncryptionAlgorithm = PdfEncryptionAlgorithm.RC4_128;
so.EncryptionDetails.Permissions = PdfPermissions.Printing;
Password protection
And the last step is saving a document as PDF file 
// Save a document as the PDF file with Security Options
            dc.Save(@"d:\Download\DocumentProperties.pdf", so);
User Password

You may find extra info about Document Properties

Well done!

Complete code

using System;
using SautinSoft.Document;
using SautinSoft.Document.Drawing;
using System.IO;
using System.Linq;

namespace Example
{
    class Program
    {
        static void Main(string[] args)
        {
            // Get your free trial key here:   
            // https://sautinsoft.com/start-for-free/

            SecureDocument();
        }
		
        /// <summary>
        /// Create and secure a PDF document by password. Also set the permissions for the document.
        /// </summary>
        /// <remarks>
        /// Details: https://www.sautinsoft.com/products/document/help/net/developer-guide/security-options-net-csharp-vb.php
        /// </remarks>
        public static void SecureDocument()
        {
            string filePath = @"ProtectedDocument.pdf";

            DocumentCore dc = new DocumentCore();

            // Let's create a simple document.
            dc.Content.End.Insert("Hello World!!!", new CharacterFormat() { FontName = "Verdana", Size = 65.5f, FontColor = Color.Orange });

            PdfSaveOptions so = new PdfSaveOptions();
            // Password Protection
            so.EncryptionDetails.UserPassword = "12345";
            // EncryptionAlgorithm
            so.EncryptionDetails.EncryptionAlgorithm = PdfEncryptionAlgorithm.RC4_128;
            //Permissions: Content Copying, Commenting, Printing, Changing the Document, filing of form fildes etc
            //Printing: Allowed
            so.EncryptionDetails.Permissions = PdfPermissions.Printing;
            
            // Save a document as the PDF file with Security Options.
            dc.Save(filePath, so);

            // Open the result for demonstration purposes.
            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(filePath) { UseShellExecute = true });
        }
    }
}

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Imports System
Imports System.IO
Imports SautinSoft.Document

Module Sample
    Sub Main()
        SecureDocument()
    End Sub
    ''' Get your free trial key here:   
    ''' https://sautinsoft.com/start-for-free/
    ''' <summary>
    ''' Create and secure a PDF document by password. Also set the permissions for the document.
    ''' </summary>
    ''' <remarks>
    ''' Details: https://www.sautinsoft.com/products/document/help/net/developer-guide/security-options-net-csharp-vb.php
    ''' </remarks>
    Sub SecureDocument()
        Dim filePath As String = "ProtectedDocument.pdf"

        Dim dc As New DocumentCore()

        ' Let's create a simple document.
        dc.Content.End.Insert("Hello World!!!", New CharacterFormat() With {
                .FontName = "Verdana",
                .Size = 65.5F,
                .FontColor = Color.Orange
            })

        Dim so As New PdfSaveOptions()
        ' Password Protection
        so.EncryptionDetails.UserPassword = "12345"
        ' EncryptionAlgorithm
        so.EncryptionDetails.EncryptionAlgorithm = PdfEncryptionAlgorithm.RC4_128
        'Permissions: Content Copying, Commenting, Printing, Changing the Document, filing of form fildes etc
        'Printing: Allowed
        so.EncryptionDetails.Permissions = PdfPermissions.Printing

        ' Save a document as the PDF file with Security Options.
        dc.Save(filePath, so)

        ' Open the result for demonstration purposes.
        System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(filePath) With {.UseShellExecute = True})
    End Sub
End Module

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If you need a new code example or have a question: email us at support@sautinsoft.com or ask at Online Chat (right-bottom corner of this page) or use the Form below:


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We are developing .Net components since 2002. We know PDF, DOCX, RTF, HTML, XLSX and Images formats. If you need any assistance with creating, modifying or converting documents in various formats, we can help you. We will write any code example for you absolutely free.