Itextsharp Remove PDF Encryption

In the operation of the PDF file will encounter the PDF file encryption, can not operate the problem, looking for data from the network the morning, tinker out the following code, you can convert the encrypted PDF into an unencrypted PDF file, pure code, without the use of PDF decryption software, before using the following references need to be imported, The Itextsharp version used is 5.5.9.0.

 
 
1 using iTextSharp.text.pdf;
2 using iTextSharp.text;
3 using System.IO;

1 /// <summary>
 2 /// PDF encryption will be removed
 3 /// </ summary>
 4 /// <param name = "sourceFullName"> Source file path (eg: D: \ old.pdf) </ param>
 5 /// <param name = "newFullName"> destination file path (eg: D: \ new.pdf) </ param>
 6 private static void deletePDFEncrypt (string sourceFullName, string newFullName)
 7 {
 8 if (string.IsNullOrEmpty (sourceFullName) || string.IsNullOrEmpty (newFullName))
 9             {
10 throw new Exception ("Source or destination file path cannot be empty or null.")
11}
12 //Console.WriteLine("Read PDF ");
13 try
14 {
15 // Create a PdfReader object
16 PdfReader reader = new PdfReader (sourceFullName);
17 PdfReader.unethicalreading = true;
18 // Get document pages
19 int n = reader.NumberOfPages;
20 // Get the size of the first page
21 Rectangle pagesize = reader.GetPageSize (1);
22 float width = pagesize.Width;
23 float height = pagesize.Height;
24 // create a document variable
25 Document document = new Document (pagesize, 50, 50, 50, 50);
26 // Create this document
27 PdfWriter writer = PdfWriter.GetInstance (document, new FileStream (newFullName, FileMode.Create));
28 // open document
29 document.Open ();
30 // add content
31 PdfContentByte cb = writer.DirectContent;
32 int i = 0;
33 int p = 0;
34 while (i <n)
35 {
36 document.NewPage ();
37 p ++;
38 i ++;
39 PdfImportedPage page1 = writer.GetImportedPage (reader, i);
40 cb.AddTemplate (page1, 1f, 0, 0, 1f, 0, 0);
41}
42 // Close the document
43 document.Close ();
44}
45 catch (Exception ex)
46 {
47 throw new Exception (ex.Message);
48}
49} 

Before using code to convert the properties of the PDF, such as:

After conversion:

Itextsharp Remove PDF Encryption