Wizardhax.com // HACKED CLIENTS, Giving a written book (as regular player) to an admin could op you etc.

Apparently giving a written book to an admin on a server could op that player (or anyone they inserted as name)?
See: http://www.wizardhax.com/2015/05/01/minecraft-1-8-1-8-4-book-hack-force-op-download

Need to do this remark: I can't believe this guy https://www.youtube.com/user/wizardhaxtube got close to 100k Subscribers, he also got videos such as "How-to Install Minecraft Hacked Clients on the New Launcher Tutorial" http://www.wizardhax.com/2013/07/02/how-to-install-minecraft-hacked-clients-on-the-new-launcher-tutorial and MANY other videos containing "Hacked client" in their title: https://www.youtube.com/user/wizardhaxtube/videos

I'm not sure if that command book exploit is a thing that is fixable and if it has been already reported, as this obviously is not a bugpost someone would/should make public, so sorry in advance if this is a duplicate.

I'm also not sure if I should make another bugpost for the "How-to Install Minecraft Hacked Clients on the New Launcher Tutorial" thing that guy shows there, or the "Sign Crash Player Kicker", "Minecraft Online Premium Account Validator" and all the other bad things.

I need to leave this to Mojang, but I'd strongly suggest to report this guy to YouTube and to take him down, as he MUST go against your Terms and Conditions for sure, regarding hacked clients etc., and it cannot be that this guy is making money out of videos containing hacked Minecraft clients.

I'd also have a look at their crew, to catch them as well, if possible:
http://www.wizardhax.com/the-crew

Apparently wizardhax.com exists since 2010 (see attached pics).

They also seem to have a Minecraft server:
http://www.wizardhax.com/play

Regards, Meri