This plugin is a normal Joomla! content plugin and does not require the Form2Content extension!
The content restriction plugin is another plugin by Open Source Design. It allows you to control (show or hide) part of a Joomla article content. What is shown or hidden can be determined by six different variables, namely the user group, the user, the author group , if the article is featured or on the homepage or the author.
Please find extended documentation and examples here!