How to create word document in read only mode programmatical

// Create new document.
var document = new DocumentModel();
 
// Add document content.
document.Sections.Add(
    new Section(document,
        new Paragraph(document, "Sample content"));
 
// Set document as read-only.
document.Protection.StartEnforcingProtection(EditingRestrictionType.NoChanges, null);
 
// Send (download) document to client's browser.
document.Save(this.Response, "Sample.docx");