Perfect! Just the plugin I was looking for for my server. This plugin also acts as a great way to prevent book and quills entirely if you would like by setting the character maximum to 0. That is what I needed it for at least.

Saved me time. Several years without issue, and now suddenly I need a anti-book-abuse plugin. Thanks for the simple solution!

Surprised theres no other reviews for this plugin.
I had a spiteful kid who couldn't read the rules and found a book dupe on the server, for which I thought was previously patched. I simply added this plugin and it was patched like magic. Greatly appreciated, its simple plug and go.