I have discovered a way to hack my minecraft account

I can play in 2 computers with the same account, and i have discoverd a way to change one name, to play in LAN or hamachi-LAN.
I prepared a video showing how to do it, its in the link below, just people who have this link could see, so it won`t spreed.
https://youtu.be/Hid3Pl5_G6U
It`s from my youtube chanel.