.NET Core 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. .NET Core C#

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

Chilkat.Pdf pdf = new Chilkat.Pdf();

//  Removing the encryption needs owner rights: load with the owner password.
pdf.OwnerPassword = "owner-secret";
success = pdf.LoadFile("qa_data/pdf/encrypted_user_password.pdf");
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Chilkat.JsonObject json = new Chilkat.JsonObject();
Chilkat.JsonObject jsonOut = new Chilkat.JsonObject();
success = pdf.Protection("getInfo",json,jsonOut);
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Debug.WriteLine("encrypted, as loaded: " + Convert.ToString(jsonOut.BoolOf("loaded.encrypted")));
Debug.WriteLine("algorithm: " + jsonOut.StringOf("loaded.algorithm"));

success = pdf.Protection("removeEncryption",json,jsonOut);
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Debug.WriteLine("will be saved encrypted: " + Convert.ToString(jsonOut.BoolOf("pending.encrypted")));

success = pdf.WriteFile("qa_output/minutes_unprotected.pdf");
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

//  The result is an ordinary PDF that opens without a password.
Chilkat.Pdf reader = new Chilkat.Pdf();
Chilkat.JsonObject info = new Chilkat.JsonObject();
success = reader.PreLoadCheck("qa_output/minutes_unprotected.pdf",info);
if (success == false) {
    Debug.WriteLine(reader.LastErrorText);
    return;
}

Debug.WriteLine("encrypted: " + Convert.ToString(info.BoolOf("encrypted")));
success = reader.LoadFile("qa_output/minutes_unprotected.pdf");
if (success == false) {
    Debug.WriteLine(reader.LastErrorText);
    return;
}

Debug.WriteLine("pages: " + Convert.ToString(reader.NumPages));

//  Sample output:

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