Go 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. Go

    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 := chilkat.NewPdf()

    //  Removing the encryption needs owner rights: load with the owner password.
    pdf.SetOwnerPassword("owner-secret")
    success = pdf.LoadFile("qa_data/pdf/encrypted_user_password.pdf")
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        return
    }

    json := chilkat.NewJsonObject()
    jsonOut := chilkat.NewJsonObject()
    success = pdf.Protection("getInfo",json,jsonOut)
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    fmt.Println("encrypted, as loaded: ", *jsonOut.BoolOf("loaded.encrypted"))
    fmt.Println("algorithm: ", *jsonOut.StringOf("loaded.algorithm"))

    success = pdf.Protection("removeEncryption",json,jsonOut)
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    fmt.Println("will be saved encrypted: ", *jsonOut.BoolOf("pending.encrypted"))

    success = pdf.WriteFile("qa_output/minutes_unprotected.pdf")
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    //  The result is an ordinary PDF that opens without a password.
    reader := chilkat.NewPdf()
    info := chilkat.NewJsonObject()
    success = reader.PreLoadCheck("qa_output/minutes_unprotected.pdf",info)
    if success == false {
        fmt.Println(reader.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        reader.DisposePdf()
        info.DisposeJsonObject()
        return
    }

    fmt.Println("encrypted: ", *info.BoolOf("encrypted"))
    success = reader.LoadFile("qa_output/minutes_unprotected.pdf")
    if success == false {
        fmt.Println(reader.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        reader.DisposePdf()
        info.DisposeJsonObject()
        return
    }

    fmt.Println("pages: ", reader.NumPages())

    //  Sample output:

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

    pdf.DisposePdf()
    json.DisposeJsonObject()
    jsonOut.DisposeJsonObject()
    reader.DisposePdf()
    info.DisposeJsonObject()