How to get OP on Minecraft Servers

I posted this in giveaways, so I might as well post it here. Title says it all. This does not involve social engineering or the book/sign force OP hack. I have tweaked this method a bit too to make it a bit easier.

I've also explained how the hack works and how you can prevent it happening in your own server. Please note that this doesn't work on all servers.

Thanks and Reps are appreciated.