Thank you for contacting us.
Could you send us the template document so we can investigate why it is not being opened by our RadRichTextBox control?
About the document protection:
You can read the article
which explains how to create and modify document protection regions.
We're looking forward to your reply.
Check out Telerik Analytics, the service which allows developers to discover app usage patterns, analyze user data, log exceptions, solve problems and profile application performance at run time. Watch the videos
and start improving your app based on facts, not hunches.