Visual Basic 6.0

PDF Get Encryption and Permissions Information

See more PDF Signatures Examples

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.

Visual Basic 6.0

Dim success As Long
success = 0

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

Dim pdf As New ChilkatPdf

' Load a PDF.
success = pdf.LoadFile("c:/someDir/sample.pdf")
If (success = 0) Then
    Debug.Print pdf.LastErrorText
    Exit Sub
End If

' Get information about the PDF that was collected in the call to LoadFile.
Dim ljd As New ChilkatJsonObject
pdf.GetLastJsonData ljd

ljd.EmitCompact = 0

Debug.Print ljd.Emit()

' 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

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