Identifying annotation source

I have a document which has burnt annotation like Line , Rectangle.
I have opened the document on Radaee viewer and drawn a Line , Rectangle.
Using the Annotation class , I can fetch the list of rendered annotations , but how can I differentiate between the burnt annotation (Line , Rectangle) with the annotation which are drawn by the user (Line , Rectangle) ?

Hi,
sorry but at the moment this function is not yet supported..

We're evaluating your request with dev team.

Hi,
please check the new beta version !

Look at these new methods:

Annotation.GetPopupLabel
Annotation.SetPopupLabel

By convention, this entry identifies the user who added the annotation.