First off the module leverages the new permissions for content types of drupal 6: "edit any type", and "delete any type". Then consequently it makes also use of the "edit own type" and "delete own type" permissions and provides a "view own type" setting. So the 5.x "author" checkbox has been removed in favour of these role based settings.
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Comment #1
agogo commentedIm quoting the module author:
From http://more.zites.net/content_access_for_drupal_6
I also wondered where it went and then acctually searched for info by my self.