text: Force Login is a simple lightweight plugin that requires visitors to log in to interact with the website.
  Set multiple passwords for your protected pages so you can give them to different users.
  Basic Authentication for protected your development WordPress site like .htpasswd
  Easily password protect the child pages/posts of a post/page that is password protected.
  BuddyPress Members Only restricts Your Buddypress and Wordpress to logged in/registered members.
  This plugin allows passwords for password-protected pages/posts to be passed directly through the URL.
  Applies the same protection to children pages applied to the parent page.
  Small script that removes Protected: and Private: from titles of posts and pages that are password protected and private.
  Add more than 1 password to your protected pages, also administrators and page's authors can view the protected pages without password.
  A simple and lightweight password protection for Wordpress.
  Custom text message for password protected pages and posts
  Disables new topic creation in some forums for determined roles.
  This plugin turns the cookie for a password-protected post into a session-based cookie.
  Once activated, private posts will no longer have the word "Private: " appended to the beginning of their title.
  Lightweb Media Basic Authentication for protected your development WordPress site like .htpasswd
  Some themes prefix post titles with "Protected" or "Private"; this plugin removes those prefixes
  A neat User/File Management with a jQuery frontend to display customizable directory/file tree. Now with public download area.
  A simple WordPress plugin to force login.
  oQey Pdfs plugin is a Wordpress Plugin that allows to add and manage protected pdf files.
  Show each website visitor a quick age verification screen before using the site. Saves the response in a cookie for further visits.