(C#) 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.

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

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

// Open a PDF.
// Starting in Chilkat v9.5.0.96, the LastJsonData will contain information about encryption and permissions.
bool success = pdf.LoadFile("c:/someDir/sample.pdf");
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

// Examine the LastJsonData
Chilkat.JsonObject ljd = pdf.LastJsonData();
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");