All of the the content in these pages is restricted using the WooCommerce Pay Per Post plugin.
Protection Type
Simple
You just have to purchase the product associated with the page to get access to the content. This protection type is available in the FREE version of the plugin.
Example: Purple Martin Birdhouse Plans
Page View Restriction
This is a PREMIUM feature, not only do you have to purchase the product associated with the page to get access, but you only have access to the content for so many pageviews before you need to repurchase!
Example: Duck Box Plans
Expiry / Expiration Restriction
This is a PREMIUM feature, not only do you have to purchase the product associated with the page to get access, but you only have access to the content for a set amount of time before you need to repurchase!
Example: Wren House Plans