SoftwarePassport from Digital River but I can't find the link anywhere. I didn't update since last 5 years so maybe is the software down.

However I wouldn't recommend SoftwarePassport. It is safe for sure but we don't really have problems with hackers you know. The drawback with SP is that it runs its own DLL in memory and is unstable on some systems - very few indeed. A more simple key system would do, and an online registration would be a plus (this would allow to disable some keys).

Yarp - author of P3DO Organizer for Poser