When a book has data files that information is shown in the book details panel on the right. And if you prefer to see it in a column you can do so by setting up a custom column based on templates. Once you have the column you can add an emblem to the cover grid based on it via Preferences->Look & feel->Cover grid->Emblems.
As for adding access control/spying on user activity to the content server, I'm afraid I have no interest in adding such functionality. You can restrict what books a given user account has access to and whether the user account can make changes to the library, thats all.
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