Drupal 7 Module Development

Node Access
'title' => t('View role-restricted content as authenticated
user'),
'description' => t('Allow anonymous users to view content
created by authenticated users. Lack of this permission removes access
for users in custom roles.'),
),
);
}
So now we have a new permission setting:
We can then use hook_node_grants_alter() to modify the permissions that
anonymous (and other users) have. To do so, we have to understand the format
for the $grants array that is passed to our hook.
Drupal gathers these grants with the node_access_grants() function, which
combines all module grants into a single associative array of arrays. The $grants
array keys are the realms of access control; and the array associated to these keys
indicate the grant ids that are active for that realm. A var_dump() of a typical
$grants array looks like so:
array(1) {
["role_access"] => array(1) {
[0] => int(2),
[1] => int(4),
}
}
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