Restrict Content Pro – Restriction Timeouts GPL Overview:

This Professional add-on allows site admins to specify a date and time when restricted content will have its restrictions removed, making it available to everyone.

Do you wish to sell early access to content but then allow the general public to access it as well after a certain amount of time? That’s precisely what this add-on allows you to do.

Restriction timeouts can be configured on a page-by-page basis or at the category or tag level.