How to extract File info, Metadata and Security Options from an existing PDF file

PDFOperation operation = new PDFOperation("sample.pdf", "");

PDFDocInfo info = operation.DocumentInfo;

XmlDocument xml = operation.Metadata;

PDFCryptoOptions crypto = operation.ProtectionOptions;

operation.Close();

Console.WriteLine("Author: " + info.Author);

Console.WriteLine("Creation date: " + info.CreationDate);

Console.WriteLine("Keywords: " + info.Keywords);

Console.WriteLine("Subject: " + info.Subject);

Console.WriteLine("Title: " + info.Title);

Console.WriteLine("Protection options: " + crypto.ToString());