public byte[] SaveDocument(
    DocumentFormat documentFormat,
    EncryptionSettings encryptionSettings
)

Public Function SaveDocument(
    documentFormat As DocumentFormat,
    encryptionSettings As EncryptionSettings
) As Byte()

using DevExpress.XtraRichEdit;
using DevExpress.XtraRichEdit.API.Native;
// ...

using (RichEditDocumentServer wordProcessor = new RichEditDocumentServer())
{
    // Specify encryption settings.
    EncryptionSettings encryptionSettings = new EncryptionSettings
    {
        Type = EncryptionType.Strong,
        Password = "password"
    };

// Save the document to a byte array.
byte[] docBytes = wordProcessor.SaveDocument(DocumentFormat.Docx, encryptionSettings);
}

Imports DevExpress.XtraRichEdit
Imports DevExpress.XtraRichEdit.API.Native
' ...

Using wordProcessor As New RichEditDocumentServer()
    ' Specify encryption settings.
    Dim encryptionSettings As New EncryptionSettings With {
        .Type = EncryptionType.Strong,
        .Password = "password"
    }

' Save the document to a byte array.
Dim docBytes() As Byte = wordProcessor.SaveDocument(DocumentFormat.Docx, encryptionSettings)
End Using