(Lianja) PDF Get Encryption and Permissions Information

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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.

Note: This example requires Chilkat v9.5.0.96 or later.

Chilkat Lianja Extension Download Chilkat Lianja Extension

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

loPdf = createobject("CkPdf")

// Open a PDF.
// Starting in Chilkat v9.5.0.96, the LastJsonData will contain information about encryption and permissions.
llSuccess = loPdf.LoadFile("c:/someDir/sample.pdf")
if (llSuccess = .F.) then
    ? loPdf.LastErrorText
    release loPdf
    return
endif

// Examine the LastJsonData
loLjd = loPdf.LastJsonData()
loLjd.EmitCompact = .F.

? loLjd.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

lcPdfVersion = loLjd.StringOf("pdfVersion")
lcFilter = loLjd.StringOf("encrypt.filter")
lnKeyLength = loLjd.IntOf("encrypt.keyLength")
V = loLjd.IntOf("encrypt.V")
R = loLjd.IntOf("encrypt.R")
P = loLjd.IntOf("encrypt.P")
lcPrintLowResolution = loLjd.StringOf("encrypt.perm.printLowResolution")
lcPrintHighResolution = loLjd.StringOf("encrypt.perm.printHighResolution")
lcModifyOther = loLjd.StringOf("encrypt.perm.modifyOther")
lcModifyAnnotations = loLjd.StringOf("encrypt.perm.modifyAnnotations")
lcModifyForms = loLjd.StringOf("encrypt.perm.modifyForms")
lcFillInForms = loLjd.StringOf("encrypt.perm.fillInForms")
lcAssembleDoc = loLjd.StringOf("encrypt.perm.assembleDoc")
lcExtractAnyPurpose = loLjd.StringOf("encrypt.perm.extractAnyPurpose")
lcExtractAccessibility = loLjd.StringOf("encrypt.perm.extractAccessibility")
lcMethod = loLjd.StringOf("encrypt.method")


release loPdf