deactivate second Studio Licence?

Folks
I'm sharing my Studio Licence with a fellow editor who is working on the same project.
He has now decided to get his own Keyboard Editor which will have its own licence.
How do he disable the licence on his computer?
Will I have to reinstal my licence after he disables the second licence?
Thanks for your help.
Cheers, Sanjay
I'm sharing my Studio Licence with a fellow editor who is working on the same project.
He has now decided to get his own Keyboard Editor which will have its own licence.
How do he disable the licence on his computer?
Will I have to reinstal my licence after he disables the second licence?
Thanks for your help.
Cheers, Sanjay