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


Encryption enables you to securely protect the content of your files from unwanted viewers and against unwanted actions like printing, selecting text, etc.
Write Protection refers to a mode in which the document's contents can be edited but the document cannot be resaved using the same file name.
Contains details for encrypting and access permissions for a document.
Demonstrates how to set permissions on a PDF document generated by Sautinsoft.Document.

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;
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);

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)
        {
            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
            //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 });
        }
    }
}

Download. 

        
            Imports System
Imports System.IO
Imports SautinSoft.Document

Module Sample
    Sub Main()
        SecureDocument()
    End Sub

    ''' <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

Download.

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