The Content Freeze plugin allows an admin to 'lock' all content on the site to prevent the site being edited.
Facebook Like Lock for WordPress. Locks your content and user can unlock by clicking on like button.
With a single click WP Share To Unlock will lock content on any post/page, including videos, to get viral traffic from Facebook to your website.
Easily integrate your Content & File Locker produced by Mighty Content Locker into Your WordPress site.