"Speaking of the license policy: sure you can reinstall it on the same harddrive! That's because they write some signature somewhere on the drive, which isn't very trustworthy either. But nevertheless, when you do it, the system contacts CL and checks with their server." Actually, that isn't how they do that. Your hard drive has a built in unique identifier fromt he manufacturere int he hardware. The Poser5 license seems to use that as one of the seeds for calculating the challenge.