C#

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.

C#

bool success = false;

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

Chilkat.Pdf pdf = new Chilkat.Pdf();

//  Load a PDF.
success = pdf.LoadFile("c:/someDir/sample.pdf");
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

//  Get information about the PDF that was collected in the call to LoadFile.
Chilkat.JsonObject ljd = new Chilkat.JsonObject();
pdf.GetLastJsonData(ljd);

ljd.EmitCompact = false;

Debug.WriteLine(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

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