(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.

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

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <CkPdf.h>
#include <CkJsonObject.h>

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

    CkPdf 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) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    // Examine the LastJsonData
    CkJsonObject *ljd = pdf.LastJsonData();
    ljd->put_EmitCompact(false);

    std::cout << ljd->emit() << "\r\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

    // Chilkat functions returning "const char *" return a pointer to temporary internal memory owned and managed by Chilkat.
    // See this example explaining how this memory should be used: const char * functions.

    const char *pdfVersion = ljd->stringOf("pdfVersion");
    const char *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");
    const char *PrintLowResolution = ljd->stringOf("encrypt.perm.printLowResolution");
    const char *PrintHighResolution = ljd->stringOf("encrypt.perm.printHighResolution");
    const char *ModifyOther = ljd->stringOf("encrypt.perm.modifyOther");
    const char *ModifyAnnotations = ljd->stringOf("encrypt.perm.modifyAnnotations");
    const char *ModifyForms = ljd->stringOf("encrypt.perm.modifyForms");
    const char *FillInForms = ljd->stringOf("encrypt.perm.fillInForms");
    const char *AssembleDoc = ljd->stringOf("encrypt.perm.assembleDoc");
    const char *ExtractAnyPurpose = ljd->stringOf("encrypt.perm.extractAnyPurpose");
    const char *ExtractAccessibility = ljd->stringOf("encrypt.perm.extractAccessibility");
    const char *Method = ljd->stringOf("encrypt.method");
    }