Classic ASP

PDF Get Encryption and Permissions Information

Determine if a PDF is encrypted, and the associated user permissions.

Note: Some PDFs are encrypted but not password-protected. In such cases, encryption is used primarily for preventing unauthorized modifications to the document, but it doesn't restrict access. Therefore, you can open and read the document without a password.

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

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

set pdf = Server.CreateObject("Chilkat.Pdf")

' Load a PDF.
success = pdf.LoadFile("c:/someDir/sample.pdf")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( pdf.LastErrorText) & "</pre>"
    Response.End
End If

' Get information about the PDF that was collected in the call to LoadFile.
set ljd = Server.CreateObject("Chilkat.JsonObject")
pdf.GetLastJsonData ljd

ljd.EmitCompact = 0

Response.Write "<pre>" & Server.HTMLEncode( ljd.Emit()) & "</pre>"

' Sample output:

' {
'   "pdfVersion": "1.6",
'   "encrypt": {
'     "filter": "/Standard",
'     "keyLength": 128,
'     "V": 4,
'     "R": 4,
'     "P": -1340,
'     "perm": {
'       "printLowResolution": "allowed",
'       "printHighResolution": "allowed",
'       "modifyOther": "not allowed",
'       "modifyAnnotations": "allowed",
'       "modifyForms": "not allowed",
'       "fillInForms": "allowed",
'       "assembleDoc": "allowed",
'       "extractAnyPurpose": "not allowed",
'       "extractAccessibility": "not allowed"
'     },
'     "method": "AESV2"
'   }
' }

' Use this online tool to generate parsing code from sample JSON: 
' Generate Parsing Code from JSON

pdfVersion = ljd.StringOf("pdfVersion")
Filter = ljd.StringOf("encrypt.filter")
KeyLength = ljd.IntOf("encrypt.keyLength")
V = ljd.IntOf("encrypt.V")
R = ljd.IntOf("encrypt.R")
P = ljd.IntOf("encrypt.P")
PrintLowResolution = ljd.StringOf("encrypt.perm.printLowResolution")
PrintHighResolution = ljd.StringOf("encrypt.perm.printHighResolution")
ModifyOther = ljd.StringOf("encrypt.perm.modifyOther")
ModifyAnnotations = ljd.StringOf("encrypt.perm.modifyAnnotations")
ModifyForms = ljd.StringOf("encrypt.perm.modifyForms")
FillInForms = ljd.StringOf("encrypt.perm.fillInForms")
AssembleDoc = ljd.StringOf("encrypt.perm.assembleDoc")
ExtractAnyPurpose = ljd.StringOf("encrypt.perm.extractAnyPurpose")
ExtractAccessibility = ljd.StringOf("encrypt.perm.extractAccessibility")
Method = ljd.StringOf("encrypt.method")

%>
</body>
</html>