Uses additional per-page UNIX-like "access rights" to map indirectly
to ring/permission levels of registered users. It does not rely upon,
but should be used in conjunction to one of the distributed simple
["auth_userdb"] plugins. It extends user management by providing user
groups (which is not a core ewiki_auth feature, and won't become).

The complicated internals are described in this plugins head comment.
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You cannot modify the ProtectedMode file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the ProtectedMode.Discussion.