More of the high profile softwares are switching to "activation"
Adobe's line of products, Microsoft OS's, etc.
So what's the difference between a standard serial and an activation serial?
My best guess is a serial is a one time answer.
Enter the serial once, for any machine, and if correct, you sucessfully registered the product
For activation, first enter a serial. Next it creates a dynamic "activation" serial using an algorithm based on the serial you entered before and some sort of hardware ID.
Am I close with that one?