I'm not an avid mine craft player but I feel like playing a bit. A few questions:
Can the account be used to play minecraft anywhere in the world?
What steps need to be taken to ensure you wouldn't regain access to the account once (if) I buy it.
I can answer for OP
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
Yes it can be played anywhere in the world
You can change the email address of the account and the password of the account to not give him access.