Introduction

public static void SaveWithPassword()
{
  Console.WriteLine( "=== SAVE WITH PASSWORD ===" );
  var outputFileName = "SaveWithPassword.pdf";
  var outputPath = EncryptionsSample.EncryptionsSampleOutputDirectory + outputFileName;

  // Creates a PdfDocument.
  using( var pdfoutput = PdfDocument.Create( outputPath ) )
  {
    // Gets the first Page.
    var page = pdfoutput.Pages.First();

    // Adds a title.
    var textStyle = TextStyle.WithFont( pdfoutput.Fonts.GetStandardFont( StandardFontType.Helvetica ), 15d );
    page.AddParagraph( "Save Document With Password", textStyle, new ParagraphStyle( ParagraphHorizontalAlignment.Center ) );

    // Defines a TextStyle that will be used to add the text.
    var textFont = pdfoutput.Fonts.GetStandardFont( StandardFontType.Courier );

    // Adds text at a specific position with a font and size.
    page.AddText( "This page is encrypted with password : owner", new Point( 75, 100 ), TextStyle.WithFont( textFont, 15 ) );

    // Define the password to use for encrypting this Pdf document.
    var encryptionOptions = new EncryptionOptions()
    {
      // User password will be necessary to open the saved document.
      UserPassword = "user",
      // Owner password will be necessary to modify the saved document.
      OwnerPassword = "owner",
      // Set the wanted Profile for encryption.
      Profile = EncryptionProfile.Aes128,
      // Set the allowed Permissions for the PDF Document.
      Permissions = Permissions.Print | Permissions.CopyContent | Permissions.AccessibilityCopyContent
    };

    // Create the save options and include the new encryption options.
    var saveOptions = new SaveOptions() { Encryption = encryptionOptions };

    // Saves the output document.
    pdfoutput.Save( saveOptions );
    Console.WriteLine( $"Info exported to path: {outputFileName}" );
  }
}