LIC or PSN

Hello, i have a problem the version of uvision4 and i want to to download the update.But to download the update they ask me for a number-LIC or PSN.What is this number and where can i find it?? And...
what is PSN

Hi. i have download Keil software for ARM from here. now its the lite version and i want to buy a licence but i dont have PSN code. where shuold i found it???
LIC or PSN

Hello, i have a problem the version of uvision4 and i want to to download the update.But to download the update they ask me for a number-LIC or PSN.What is this number and where can i find it?? And...
what is PSN

Hi. i have download Keil software for ARM from here. now its the lite version and i want to buy a licence but i dont have PSN code. where shuold i found it???
where I get an PSN?

I downloaded the eval version of the ARM MDK. For registration I need a PSN. Where can I get it?