Password Protection in C# and VB.NET

See the example below for how to password encrypt an existing PDF file.

Complete code

using System;
using SautinSoft.Pdf;
using System.IO;

class Program
{
	static void Main()
	{
		// This property is necessary only for licensed version.
		//SautinSoft.Pdf.Serial = "XXXXXXXXXXX";

		using (var document = PdfDocument.Load("Reading.pdf"))
		{
			// Set password-based encryption with password required to open a PDF document.
			document.SaveOptions.SetPasswordEncryption().DocumentOpenPassword = "user1234";

			// Save PDF document to an encrypted PDF file.
			document.Save("SautinSoft.pdf");
		}
	}
}

Download.

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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.