AutoIt Requires Chilkat v11.7.0+

Find Out Whether a PDF Needs a Password Before Loading It

See more PDF Protection Examples

Demonstrates PreLoadCheck, which examines a PDF file without loading it and without any password. It reports whether the file is encrypted, by which method and algorithm, whether a password is needed to open it, and what its permissions are. An application uses it to decide whether to ask for a password, or which certificate it needs, before calling LoadFile. PreLoadCheckBd does the same for a PDF held in memory. AutoIt

Local $bSuccess = False

;  This example requires the Chilkat API to have been previously unlocked.
;  See Global Unlock Sample for sample code.

;  The PDF used in this example is available at two_page_memo.pdf

;  The PDF used in this example is available at encrypted_user_password.pdf

;  The PDF used in this example is available at no_copy_permission.pdf

$oPdf = ObjCreate("Chilkat.Pdf")
$oInfo = ObjCreate("Chilkat.JsonObject")

;  A PDF that is not encrypted.  Nothing but "encrypted" is reported for it.
$bSuccess = $oPdf.PreLoadCheck("qa_data/pdf/two_page_memo.pdf",$oInfo)
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("two_page_memo.pdf" & @CRLF)
ConsoleWrite("  encrypted: " & $oInfo.BoolOf("encrypted") & @CRLF)

;  A PDF that needs a password to open.
$bSuccess = $oPdf.PreLoadCheck("qa_data/pdf/encrypted_user_password.pdf",$oInfo)
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("encrypted_user_password.pdf" & @CRLF)
ConsoleWrite("  encrypted: " & $oInfo.BoolOf("encrypted") & @CRLF)
ConsoleWrite("  method: " & $oInfo.StringOf("method") & @CRLF)
ConsoleWrite("  algorithm: " & $oInfo.StringOf("algorithm") & @CRLF)
ConsoleWrite("  openPasswordRequired: " & $oInfo.BoolOf("openPasswordRequired") & @CRLF)

;  A PDF that opens without a password but is restricted.  The permissions are readable without
;  any password.
$bSuccess = $oPdf.PreLoadCheck("qa_data/pdf/no_copy_permission.pdf",$oInfo)
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("no_copy_permission.pdf" & @CRLF)
ConsoleWrite("  encrypted: " & $oInfo.BoolOf("encrypted") & @CRLF)
ConsoleWrite("  openPasswordRequired: " & $oInfo.BoolOf("openPasswordRequired") & @CRLF)
ConsoleWrite("  may copy: " & $oInfo.BoolOf("permissions.copy") & @CRLF)

;  The typical use: ask for a password only when one is needed, then load.
$bSuccess = $oPdf.PreLoadCheck("qa_data/pdf/encrypted_user_password.pdf",$oInfo)
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

If ($oInfo.BoolOf("openPasswordRequired") = True) Then
    ;  An application would prompt for the password here.
    $oPdf.UserPassword = "secret"
EndIf

$bSuccess = $oPdf.LoadFile("qa_data/pdf/encrypted_user_password.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("loaded, pages: " & $oPdf.NumPages & @CRLF)

;  Sample output:

;  two_page_memo.pdf
;    encrypted: False
;  encrypted_user_password.pdf
;    encrypted: True
;    method: password
;    algorithm: rc4-128
;    openPasswordRequired: True
;  no_copy_permission.pdf
;    encrypted: True
;    openPasswordRequired: False
;    may copy: False
;  loaded, pages: 1