C++ Requires Chilkat v11.7.0+

Remove the Password and Encryption from a PDF

See more PDF Protection Examples

Demonstrates the removeEncryption operation, which saves the PDF with no encryption at all: no password, no restrictions. It needs owner rights, so the PDF is loaded with its owner password. As with every Protection operation, the change is applied when the file is written. C++

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

void ChilkatSample(void)
    {
    bool success = false;

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

    //  The PDF used in this example is available at encrypted_user_password.pdf

    CkPdf pdf;

    //  Removing the encryption needs owner rights: load with the owner password.
    pdf.put_OwnerPassword("owner-secret");
    success = pdf.LoadFile("qa_data/pdf/encrypted_user_password.pdf");
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    CkJsonObject json;
    CkJsonObject jsonOut;
    success = pdf.Protection("getInfo",json,jsonOut);
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "encrypted, as loaded: " << jsonOut.BoolOf("loaded.encrypted") << "\r\n";
    std::cout << "algorithm: " << jsonOut.stringOf("loaded.algorithm") << "\r\n";

    success = pdf.Protection("removeEncryption",json,jsonOut);
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "will be saved encrypted: " << jsonOut.BoolOf("pending.encrypted") << "\r\n";

    success = pdf.WriteFile("qa_output/minutes_unprotected.pdf");
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    //  The result is an ordinary PDF that opens without a password.
    CkPdf reader;
    CkJsonObject info;
    success = reader.PreLoadCheck("qa_output/minutes_unprotected.pdf",info);
    if (success == false) {
        std::cout << reader.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "encrypted: " << info.BoolOf("encrypted") << "\r\n";
    success = reader.LoadFile("qa_output/minutes_unprotected.pdf");
    if (success == false) {
        std::cout << reader.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "pages: " << reader.get_NumPages() << "\r\n";

    //  Sample output:

    //  encrypted, as loaded: True
    //  algorithm: rc4-128
    //  will be saved encrypted: False
    //  encrypted: False
    //  pages: 1
    }