Premium Content Control

Most news sites display their premium content briefly in the browser before snatching it away again, allowing enough time for the user to stop the page from loading and view the full article.

Some (i.e. WSJ) deliberately offer a "first click is free" deal where content is viewable if the site is reached by clicking a news Google result.
Exhibit A from page source:
<!--added for registration bypass2 October 3,2002-->


Then where content is not available, we have this tag (as well as scripts for no-content instead of content):

<meta name="GOOGLEBOT" content="unavailable_after: 17-Jun-2014 21:49:00 EDT" />

A blog post from 2009 mentioned that this has a limit of 5 articles, but it's not true. As long as you can search for the link location of the article it will work.

How this came about: I very much like the WSJ, but I am annoyed when LinkedIn news posts are blocked because they have linked to their premium content.