title: How to define specific permissions?
body: <p>on the project i'm working we have a site (the front office) which is accessible by anonymous users, and a subsite (the back office) which access is restricted. In the back office, i want to restrict the access of one specific page (e.g, /Pages/specificpage.aspx) to only users who are members of a certain group.</p>
  
  <p>How can i do that programmatically?</p>
  
  <p>Thanks.</p>