Unicode 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. Unicode C

#include <C_CkPdfW.h>
#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkPdfW pdf;
    HCkJsonObjectW json;
    HCkJsonObjectW jsonOut;
    HCkPdfW reader;
    HCkJsonObjectW info;

    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

    pdf = CkPdfW_Create();

    //  Removing the encryption needs owner rights: load with the owner password.
    CkPdfW_putOwnerPassword(pdf,L"owner-secret");
    success = CkPdfW_LoadFile(pdf,L"qa_data/pdf/encrypted_user_password.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        CkPdfW_Dispose(pdf);
        return;
    }

    json = CkJsonObjectW_Create();
    jsonOut = CkJsonObjectW_Create();
    success = CkPdfW_Protection(pdf,L"getInfo",json,jsonOut);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        CkPdfW_Dispose(pdf);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        return;
    }

    wprintf(L"encrypted, as loaded: %d\n",CkJsonObjectW_BoolOf(jsonOut,L"loaded.encrypted"));
    wprintf(L"algorithm: %s\n",CkJsonObjectW_stringOf(jsonOut,L"loaded.algorithm"));

    success = CkPdfW_Protection(pdf,L"removeEncryption",json,jsonOut);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        CkPdfW_Dispose(pdf);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        return;
    }

    wprintf(L"will be saved encrypted: %d\n",CkJsonObjectW_BoolOf(jsonOut,L"pending.encrypted"));

    success = CkPdfW_WriteFile(pdf,L"qa_output/minutes_unprotected.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        CkPdfW_Dispose(pdf);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        return;
    }

    //  The result is an ordinary PDF that opens without a password.
    reader = CkPdfW_Create();
    info = CkJsonObjectW_Create();
    success = CkPdfW_PreLoadCheck(reader,L"qa_output/minutes_unprotected.pdf",info);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(reader));
        CkPdfW_Dispose(pdf);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        CkPdfW_Dispose(reader);
        CkJsonObjectW_Dispose(info);
        return;
    }

    wprintf(L"encrypted: %d\n",CkJsonObjectW_BoolOf(info,L"encrypted"));
    success = CkPdfW_LoadFile(reader,L"qa_output/minutes_unprotected.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(reader));
        CkPdfW_Dispose(pdf);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        CkPdfW_Dispose(reader);
        CkJsonObjectW_Dispose(info);
        return;
    }

    wprintf(L"pages: %d\n",CkPdfW_getNumPages(reader));

    //  Sample output:

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


    CkPdfW_Dispose(pdf);
    CkJsonObjectW_Dispose(json);
    CkJsonObjectW_Dispose(jsonOut);
    CkPdfW_Dispose(reader);
    CkJsonObjectW_Dispose(info);

    }