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Drupal 7 Module Development by Ken Rickard, John Wilkins, Larry Garfield, Matt Butcher, Greg Dunlap, Matt Farina

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Chapter 9. Node Access

Out-of-the-box, Drupal is a great system for creating and managing content. Users can log in and create content. Proper use of roles and permissions allows site editors to review some or all of a site's content. Site visitors can read published posts.

But what happens if you want all site visitors to view some content, but only registered users to view a select list of restricted content? If, for example, your site requires paid registration to view in-depth articles about how to build Drupal web sites, the basic permissions provided by Drupal are not enough.

There are cases where you need more advanced rules regarding which of the users (or groups of users) can create, view, edit, and delete content. To enable these rules, ...

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