Why is my article behind a paywall?

This article describes how paywalls work and explains how it's possible to gain access to articles that are restricted by paywalls

A paywall is a method of restricting access to content, especially news, via a purchase or a paid subscription. Usually paywalls allow all readers to see the beginning of a text, but hides the rest of the text for subscribers only. 

If your keyword is mentioned behind the restricted view, the article won't be picked up by default. Luckily, Retriever provides an opportunity to purchase a paywall package that allows its customers an access behind various paywalls.