Marque, We are SURE Poser5 is using this sort of protection scheme. The instructions for how to authorize P5 using the Challenge and Response code system is in the manual being distributed at CL's web site. [End direct to Marque] It does NOT say, however, whether there is a grace period in case you're unable to get a response code quickly, how many times you may request a response code before CL challenges your legitimacy, or what types of computer system upgrades would requie a new response code. If I have a catastrophic computer failure and ask for 5 response codes in the period of 3 days, it's a pain in my butt if CL challenges my legitimacy as a user, but a failure of their protection scheme if they do NOT challenge me. If they aren't going to ever demand proof that we're valid owners, then why bother making us ask them for a code to begin with?