I locked POK books by setting POK to a high gm status level, such as 200. Anything over 20 would work, as the 20 is default for all characters.
In your Zones table, change "min_status" to 20+. If someone with inadequate status clicks on the book after this change, they will be succored to 0,0,0 in their current zone, and be told that they lack the status to continue with their action (or something along that line)
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