Encrypted Books allows encrypt and decrypt written books using Blowfish algorithm.
This plugin sends statistics about the usage to the server http://mcstats.org/. You can disable it in plugins/PluginMetric/config.yml file (opt-out option).
Q: How to set password longer than 16 characters?
A: You have to install Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy and change config file of this plugin.
Q: How to install Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy?
A: If you are running minecraft server on your private computer, VPS, dedicated server or somewhere where you have admin/root access just google how to install that. If you don't have admin/root access (e.g. game hosting), ask hosting provider, local administrator, etc...
Q: How it's encrypted?
A: It's encrypted using Blowfish algorithm and then encoded using Base64.
Q: Is there any admin command (e.g. to force decryption)?
A: No. It's encryption. Only method to hack it is bruteforce password (or read it in console logs :D).
