2 Iloks, 2 Pro Tools, 1 User Account??

Hi Everyone, I already own 1 ilok with pro tools 10 & 11 on my main pc at home. I purchased an avid fast track solo with pro tools for my teenaged son so he can have his own and stop using mine. Can I safely add the second ilok / pro tools to my already existing avid user account? I've searched around and can't find a definitive answer. Thanks in advance.