This article shows how to flat all the annotations of a page and make them part of the pdf (uneditable).
You need a Premium license and you have to call this method:
* remove all annotations and display it as normal content on page.
@return true or false
PDFPage *page = [m_doc page:index];
RadaeePDF SDK for iOS
Created : 2016-06-09 09:23:30, Last Modified : 2016-06-09 09:25:12