Open word document in readonly mode

I'm using automation to open documents in Word. Sometimes I need to open document in Read mode ON:

 var
       WordDocument: _Document;
       WA: TWordApplication;  
     begin
       WA := TWordApplication.Create( nil );
       WA.OnQuit := DocumentClose;
       WA.Connect;
       WordDocument := Wa.Documents.Open( FileName, EmptyParam, true {ReadOnly}, EmptyParam, EmptyParam, EmptyParam, EmptyParam, EmptyParam, EmptyParam, EmptyParam, EmptyParam, EmptyParam );

But user can off the Read mode in opened document:

How can I handle this in OnQuit event in procedure DocumentClose ? In DocumentClose I want to know if document is in read mode or not.

I do not have any solution because I did not have enough experience with it. So, I need your suggestions, advices about it. Sorry for my English and if I have to add more informations, please let me know. Thanks

UPDATE
I've tried to read protection type, but it's always return the first case. So, when document opening as ReadOnly isn't protected as wdAllowOnlyReading. Some documents can be protected with password, but there is not problem with it.

const 
  wdAllowOnlyReading: Longword = $00000003;
  wdNoProtection:     Longword = $ffffffff;
var
  ProtectionType: TOleEnum;
begin
  ProtectionType := WordDocument.ProtectionType;
  case ProtectionType  of
    wdNoProtection : Showmessage('NoProtection');  
    wdAllowOnlyReading: Showmessage('ReadOnly');
  end;
end;

I'm not sure exactly what you mean by "ReadOnly".

The WordDocument has a ReadOnly boolean property which is read-only in the sense that you can read its value but not set it. This property returns true if when the document was opened, it was already open e.g. on a different workstation, so that the user would get the prompt "This document is locked for editing ..." and asked whether to open the document in read-only mode or whether Word should open a copy instead.

The other sense in which a Word document might be "read only" is if the used has marked it "Final" by clicking the Word button (that leads to the File menu, etc) and gone to Prepare | Mark as Final (in the "Ribbon" versions of MS Word).

To read these properties in code you can do e.g.

  if WordDoc.Final then
    Caption := 'Final'
  else
    Caption := 'not Final';
  if WordDoc.ReadOnly then
    Caption := Caption + ' Read only'
  else
    Caption := Caption + ' Read/write'

Note: The Final property is not surfaced in Delphi's Word2000.Pas, so to use it you need to go from early binding to late binding, like this:

var vWordDoc : OleVariant;
[...]
  vWordDoc := WordDoc;
  if vWordDoc.Final then
[...]

Unlike the ReadOnly property, you can toggle the Final property simply by

  WordDoc.Final := not WordDoc.Final

But whether you can do this successfully when WordDoc.ReadOnly is True depends on why WordDoc.ReadOnly is True.

If WordDoc.ReadOnly is True because the document was edit-locked when it was opened because it was already open at another workstation, WordDoc.Final is read-only. Otoh, if it's True because you specified ReadOnly in the call to .Open(), then you need to watch out: You can then set Final to False and the user will then be able to edit the document despite its having been opened ReadOnly!

Another complication is that ProtectionType is not directly related to "ReadOnly", as I imagine you've gathered: it can, but doesn't necessarily, prevent editing except to certain regions of a document.