Password protected PDF using C#

Question

I am creating a pdf document using C# code in my process. I need to protect the docuemnt with some standard password like \"123456\" or some account number. I need to do th

Answer 1

It would be very difficult to do this without using a PDF library. Basically, you'll need to develop such library yourselves.

With help of a PDF library everything is much simpler. Here is a sample that shows how a document can easily be protected using Docotic.Pdf library:

public static void protectWithPassword(string input, string output)
{
    using (PdfDocument doc = new PdfDocument(input))
    {
        // set owner password (a password required to change permissions)
        doc.OwnerPassword = "pass";

        // set empty user password (this will allow anyone to
        // view document without need to enter password)
        doc.UserPassword = "";

        // setup encryption algorithm
        doc.Encryption = PdfEncryptionAlgorithm.Aes128Bit;

        // [optionally] setup permissions
        doc.Permissions.CopyContents = false;
        doc.Permissions.ExtractContents = false;

        doc.Save(output);
    }
}

Disclaimer: I work for the vendor of the library.