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Add Passwords And Permissions in PDF - C#

PDF SDK sample in C# demonstrating ‘Add Passwords And Permissions in PDF’

using System.Diagnostics;
using Bytescout.PDF;

namespace PasswordsAndPermissions
    /// <summary>
    /// This example demonstrates how to lock the document with a password. 
    /// PDF format supports two kinds of passwords: owner and user password.
    /// User password allows to view document and perform allowed actions.
    /// Owner password allows everything, including changing passwords and permissions.
    /// </summary>
    class Program
        static void Main()
            // Create new document
            Document pdfDocument = new Document();
            pdfDocument.RegistrationName = "demo";
            pdfDocument.RegistrationKey = "demo";

            // If you wish to load an existing document uncomment the line below and comment the Add page section instead
            // pdfDocument.Load(@".\existing_document.pdf");

            // Add page
            pdfDocument.Pages.Add(new Page(PaperFormat.A4));

            // Set document encryption algorythm
            pdfDocument.Security.EncryptionAlgorithm = EncryptionAlgorithm.RC4_40bit;
            // Set various user permissions
            pdfDocument.Security.AllowPrintDocument = false;
            pdfDocument.Security.AllowContentExtraction = false;
            pdfDocument.Security.AllowModifyAnnotations = false;
            pdfDocument.Security.PrintQuality = PrintQuality.LowResolution;
            // Set owner password
            pdfDocument.Security.OwnerPassword = "ownerpassword";
            // Set user password
            pdfDocument.Security.UserPassword = "userpassword";
            // Save document to file

            // Cleanup 

            // Open result document in default associated application (for demo purpose)
            ProcessStartInfo processStartInfo = new ProcessStartInfo("result.pdf");
            processStartInfo.UseShellExecute = true;

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