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.

Answer 2

After you create the pdf file open the file in PdfReader and use the PdfEncryptor.Encrypt method.

Answer 3

Here is a sample you can start with.

Dim InputFileStream As System.IO.FileStream = New System.IO.FileStream("C:\Test.pdf", System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read)
Dim OutputFileStream As System.IO.FileStream = New System.IO.FileStream("C:\TestPassword.pdf", System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.ReadWrite, System.IO.FileShare.None)
OutputFileStream.SetLength(0)
Dim PdfReader As PdfReader = New PdfReader(InputFileStream)
PdfEncryptor.Encrypt(PdfReader, OutputFileStream, True, password, password, PdfWriter.ALLOW_SCREENREADERS)
InputFileStream.Close()
InputFileStream.Dispose()

Answer 4

Why does a posted code block suddenly look so strange ?

Is this just me ?

 

Answer 5

Why does a posted code block suddenly look so strange ?

Is this just me ?

 Somehow you must have added an image of the code. Strange. It must be on your end.   :)

Answer 6

Must be just you, try clearing your browser's cache maybe?
 Mine seems fine.

Answer 7

Hmmm - the actual codeblock I posted earlier now looks normal, Courier font, etc. The image I posted was a screenshot of that very same codeblock taken earlier. Now the reply from Jayson Furr has a different font than anything I have seen before but still legible.

Answer 8

My post was a screenshot of the same image you screenshot and posted. But yes it does not resemble what it should, looks completely different now.

Strange it keeps changing.

Answer 9

ok 

i done it with the help of your code.

but i still have doubt about ownerpassword and userpassword ? i don't see ownerpassword useful for this task because file is only opened with userpassword ? so why need to have ownerpassword.

one more thing i find that 255 is permission but i am not familiar with permission process in windows (in linux its 4=R,2=W,1=Ex) so what permission should i set if i want that file should be opened by only administrative user.

Answer 10

http://weblog.kevinattard.com/2011/08/itextsharp-disable-pdf-printing.html

also see section 7.6.3.1 of this - http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/PDF32000_2008.pdf

Answer 11

agreed: this is OT for these forums as 3rd party products are not supported here

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Reed Kimble - "When you do things right, people won't be sure you've done anything at all"

Answer 12

Why does a posted code block suddenly look so strange ?

Is this just me ?

 

May depend on how you get here... there are now multiple ways to get to these forums through URL redirection and your starting point can (and does) affect the UI template that gets applied to the page.  You might get blue buttons and icons, or they might be purple - the code formatting seems to also be affected by some of the style templates.

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Reed Kimble - "When you do things right, people won't be sure you've done anything at all"

Answer 13

My Chrome bookmark points to "social.msdn.microsoft.com/Forums/en-US/vbgeneral/threads"

Oddly, most code blocks are what I am used to (courier new font) but suddenly as I said a few are really odd looking.

Answer 14

what i want is that nobody can convert the pdf document to other formats like .doc,.txt etc. 

for this task what permission i have to set there in setEncryption method. i think its read permission so that user can't access this file for the purpose to convert the document in different format (using 3rd party software).

so i was wondering how to use setEncryption method to give read permission not write permission.

one more question is that the file opens with userpassword then why not set null where it ask for owner password . i don't see the use of ownerpassword ?

could somebody explain on these issues ?

Answer 15

Hi,

Because this is a 3rd party product, as Devon suggested, you'd better to ask question at its official website for better support.

Thank you for your understanding.

Best Regards,
Franklin

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