As stated in the license tutorial :
on't forget Construct 2 is portable. You can install it to a USB stick, copy your license file to the install directory, and take your licensed Construct 2 with you wherever you go. Don't forget it's only for your use. You must not let anyone else use the license!
So apparently the license is set to a person, not a computer.
But don't take my word for it right now and wait a few days untill Ashley or Tom confirm or denies.