registration wall

Etymology
By analogy with.

Noun

 * 1)  A feature of a website, application or service that only allows access to certain content or functions to users who have registered by creating an account.
 * 2) * Dr. Rakesh D, Dr. Manoj Kumara N V, Dr. Darshan S, Marketing Management (page 164)
 * This can be a good way to generate leads, but keep in mind that putting up a registration wall will likely reduce the amount of SEO traffic you can drive to that guide.