How to lock the document with a password using ByteScout PDF SDK

This example demonstrates how to lock the document with a password using ByteScout PDF SDK.
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.

Program.vb:
VB

'*******************************************************************
'       ByteScout PDF SDK
'                                                                   
'       Copyright © 2016 Bytescout, https://bytescout.com        
'       ALL RIGHTS RESERVED                                         
'                                                                   
'*******************************************************************

Imports Bytescout.PDF

''' <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

    Shared Sub Main()

        ' Create new document
        Dim pdfDocument = New Document()
        pdfDocument.RegistrationName = "demo"
		pdfDocument.RegistrationKey = "demo"
        ' 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
        pdfDocument.Save("result.pdf")

        ' Cleanup 
		pdfDocument.Dispose()

        ' Open document in default PDF viewer app
        Process.Start("result.pdf")

    End Sub

End Class 

Program.cs:
C#

//*******************************************************************
//       ByteScout PDF SDK		                                     
//                                                                   
//       Copyright © 2016 ByteScout - https://bytescout.com       
//       ALL RIGHTS RESERVED                                         
//                                                                   
//*******************************************************************

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";
			// 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
			pdfDocument.Save("result.pdf");

			// Cleanup 
			pdfDocument.Dispose();

			// Open document in default PDF viewer app
			Process.Start("result.pdf");
		}
	}
} 

.