Word Encryption for DOCX in C# and VB.NET

DOCX encryption enables you to securely protect the content of your Word document from unwanted viewers by encrypting it with a password. The passwords are case-sensitive, and they can't be empty.

With GemBox.Document you can encrypt a word document programmatically in C# and VB.NET.

The following example shows how to load an encrypted DOCX file and save it as an encrypted DOCX file with a different password

using GemBox.Document;

class Program
{
    static void Main()
    {
        // If using the Professional version, put your serial key below.
        ComponentInfo.SetLicense("FREE-LIMITED-KEY");

        string inputPassword = "%InputPassword%";
        string outputPassword = "%OutputPassword%";

        var document = DocumentModel.Load("%InputFileName%",
            new DocxLoadOptions() { Password = inputPassword });

        document.Save("DOCX Encryption Output.docx",
            new DocxSaveOptions() { Password = outputPassword });
    }
}

Imports GemBox.Document

Module Program

    Sub Main()

        ' If using the Professional version, put your serial key below.
        ComponentInfo.SetLicense("FREE-LIMITED-KEY")

        Dim inputPassword As String = "%InputPassword%"
        Dim outputPassword As String = "%OutputPassword%"

        Dim document = DocumentModel.Load("%InputFileName%",
            New DocxLoadOptions With {.Password = inputPassword})

        document.Save("DOCX Encryption Output.docx",
            New DocxSaveOptions With {.Password = outputPassword})

    End Sub
End Module

Note that to read a protected or encrypted Word document, you'll need to provide a DocxLoadOptions.Password value. To write to a protected or encrypted Word document, you'll need to set a DocxSaveOptions.Password.

To read an encrypted Word document, you'll need to provide a valid password by using the property. In case of an invalid password, GemBox.Document won't be able to decrypt the file and thus a CryptographicException will occur when trying to load it.

In order to check if a Word document is encrypted, you can use one of the DocxLoadOptions.IsEncrypted static methods.