Ruby

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.

Ruby

require 'chilkat'

success = false

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

pdf = Chilkat::CkPdf.new()

# Load a PDF.
success = pdf.LoadFile("c:/someDir/sample.pdf")
if (success == false)
    print pdf.lastErrorText() + "\n";
    exit
end

# Get information about the PDF that was collected in the call to LoadFile.
ljd = Chilkat::CkJsonObject.new()
pdf.GetLastJsonData(ljd)

ljd.put_EmitCompact(false)

print ljd.emit() + "\n";

# 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")