how can a password-protected PDF file be opened programmatically?

Question

The Adobe IFilter doesn\'t provide a mechanism to supply a password to open a password-protected PDF file, so it cannot be used to open password-protected files.

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Answer 1

If you use SpirePDF then you can get images of the pages out of an ecrypted PDF like this:

using System;
using System.Drawing;
using Spire.Pdf;
namespace PDFDecrypt
{
    class Decrypt
    {
        static void Main(string[] args)
        {
            //Create Document
            String encryptedPdf = @"D:\work\My Documents\Encryption.pdf";
            PdfDocument doc = new PdfDocument(encryptedPdf, "123456");

            //Extract Image
            Image image = doc.Pages[0].ImagesInfo[0].Image;

            doc.Close();

            //Save
            image.Save("EmployeeInfo.png", System.Drawing.Imaging.ImageFormat.Png);

            //Launch
            System.Diagnostics.Process.Start("EmployeeInfo.png");
        }
    }
}