Password Protected PDF using iTextSharp

Question

hello
i create pdf files using iTextSharp in vb.net . 
i did it but now i need to create these pdf files as password protected and i can't find any method for this,
how can i create password protect a pdf using iTextSharp ?

Answer 1

That is better suited to itextsharp support, I don't think it is a vb net issue.
Edit, here is a sample:
Imports ITextSharp
Imports ITextSharp.text
Imports ITextSharp.text.pdf
Imports System.IO
Imports System.Text
Public Class Form1
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Dim doc As New Document(ITextSharp.text.PageSize.LETTER, 10, 10, 42, 35)
doc.AddAuthor("Jerry O'Brien")
doc.AddCreator("The Creator")
doc.AddSubject("ITextSharp Sample")
doc.AddTitle("A treatise on the production of Portable Document Format files")
Dim writer As PdfWriter = PdfWriter.GetInstance(doc, New FileStream("D:\sample.pdf", FileMode.Create))
Dim Upass As String = "MumboJumbo"
Dim OPass As String = "HeebieJeebie"
Dim userpass() As Byte = Encoding.ASCII.GetBytes(Upass)
Dim ownerpass() As Byte = Encoding.ASCII.GetBytes(OPass)
writer.SetEncryption(userpass, ownerpass, 255, True)
doc.Open()
Dim para As New Paragraph("This is my first paragraph")
Dim pharse As New Phrase("This is my first phrase" & vbNewLine)
Dim chunk_ As New Chunk("This is my first chunk")
doc.Add(para)
doc.Add(pharse)
doc.Add(chunk_)
doc.Close()
End Sub
End Class
FYI - I have NO IDEA what the 255 and True mean, I just put something in there that fit.