Bukkit

What is the expected output? What do you see instead?
Player bypass iplock if player uses legal account.

Please provide any additional information below.

Like http://dev.bukkit.org/server-mods/xauthpremiumautologin/?comment=32
It's simple to use, just watch for 1 event that says if players is or not premium, if is - bypass, if not - ignore.
https://github.com/kolorafa/PremiumProxy - plugin that fires that event.

In PremiumProxy v2.0 there will be ability to ask using nickname if player is premium or not (in queue due to lack of time)

I am currently getting the hang of the packet system and i Will start to use it in iplock in the future