Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
To start with the add-on, you may visit the tutorial or follow the steps below
1. Install add-on
2. Download the template file to create your document
3. Update the sensitive content to apply confidential characters style
4. Save the document and send it as normal
5. A dialog would prompt to warn you sensitive content is sending to unknown recipient(s)