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 <C_CkPdf.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkPdf pdf;
    HCkJsonObject json;
    HCkJsonObject jsonOut;
    HCkPdf reader;
    HCkJsonObject 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 = CkPdf_Create();

    //  Removing the encryption needs owner rights: load with the owner password.
    CkPdf_putOwnerPassword(pdf,"owner-secret");
    success = CkPdf_LoadFile(pdf,"qa_data/pdf/encrypted_user_password.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        return;
    }

    json = CkJsonObject_Create();
    jsonOut = CkJsonObject_Create();
    success = CkPdf_Protection(pdf,"getInfo",json,jsonOut);
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    printf("encrypted, as loaded: %d\n",CkJsonObject_BoolOf(jsonOut,"loaded.encrypted"));
    printf("algorithm: %s\n",CkJsonObject_stringOf(jsonOut,"loaded.algorithm"));

    success = CkPdf_Protection(pdf,"removeEncryption",json,jsonOut);
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    printf("will be saved encrypted: %d\n",CkJsonObject_BoolOf(jsonOut,"pending.encrypted"));

    success = CkPdf_WriteFile(pdf,"qa_output/minutes_unprotected.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    //  The result is an ordinary PDF that opens without a password.
    reader = CkPdf_Create();
    info = CkJsonObject_Create();
    success = CkPdf_PreLoadCheck(reader,"qa_output/minutes_unprotected.pdf",info);
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(reader));
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        CkPdf_Dispose(reader);
        CkJsonObject_Dispose(info);
        return;
    }

    printf("encrypted: %d\n",CkJsonObject_BoolOf(info,"encrypted"));
    success = CkPdf_LoadFile(reader,"qa_output/minutes_unprotected.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(reader));
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        CkPdf_Dispose(reader);
        CkJsonObject_Dispose(info);
        return;
    }

    printf("pages: %d\n",CkPdf_getNumPages(reader));

    //  Sample output:

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


    CkPdf_Dispose(pdf);
    CkJsonObject_Dispose(json);
    CkJsonObject_Dispose(jsonOut);
    CkPdf_Dispose(reader);
    CkJsonObject_Dispose(info);

    }