Absolute Prevent Edit - Acrobat DC

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   The Javascript in the comment flattening action is: event.target.flattenPages();
Flattening should prevent removal of exhibit labels, highlights, annotations, text boxes, etc.  However, Acrobat DC with its "Edit PDF" tool allows these items to be modified or removed.  

   Is there JS which can be added after or in place of the above JS which would render a document impervious to modification, i.e., trully flattened?  I realize that you can set permissions to deny, but would like to do this as part of an action.  I looked to the optimize function but didn't see a solution. On that thought . . . is JS which applies a modification permission denial?

Thanks to anyone who can answer.