[flexcoders] session variables

[iloveyouwisconsin]

I have a flex app that users pay to subscribe to my content. Obviously, I don't 
want to let "user A" give his login credentials to "user B" but I have no 
control over that part (some people are just evil). So, how can I prevent two 
people from using the same username at the same time? I've read that flash 
cookies wouldn't work (as the user can view the contents of such cookie w/ a 
sol-editor...correct me if I'm wrong). Is there a better way?