Using the new ItemRenamer API to hide lore.

ItemRenamerHideLore.java

package com.comphenix.example;

import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;
import org.shininet.bukkit.itemrenamer.api.RenamerAPI;
import org.shininet.bukkit.itemrenamer.api.RenamerListener;
import org.shininet.bukkit.itemrenamer.api.RenamerPriority;
import org.shininet.bukkit.itemrenamer.api.RenamerSnapshot;

import com.google.common.collect.Lists;

public class ItemRenamerHideLore extends JavaPlugin {
    @Override
    public void onEnable() {
        RenamerAPI.getAPI().addListener(this, RenamerPriority.POST_NORMAL, new RenamerListener() {
            @Override
            public void onItemsRenaming(Player player, RenamerSnapshot snapshot) {
                for (ItemStack stack : snapshot) {
                    if (stack != null && stack.hasItemMeta()) {
                        ItemMeta meta = stack.getItemMeta();
                        
                        // Our marker - hide the lore
                        if (meta.hasLore() && meta.getLore().get(0).startsWith("[ExampleMod]")) {
                            meta.setLore(null);
                            stack.setItemMeta(meta);
                        }
                    }
                }
            }
        });
    }
    
    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (sender instanceof Player) {
            Player player = (Player) sender;
            ItemStack stack = new ItemStack(Material.GOLD_AXE);
            ItemMeta meta = stack.getItemMeta();
            
            meta.setLore(Lists.newArrayList("[ExampleMod]Your custom data. Human readable?"));
            stack.setItemMeta(meta);
            
            // Testing
            player.getInventory().addItem(stack);
        }
        return true;
    }
}