This is the most common "legitimate" use of ticket generation. Sellers on "grey market" sites often sell access to a single Steam account for a few dollars. They use a custom "activator" or ticket generator that:
Denuvo Ticket Generator: Myth, Mechanism, and Modern Realities denuvo ticket generator
: The game generates a "Steam Ticket" or "App Ticket" as proof of ownership. This is the most common "legitimate" use of
: When you launch a protected game, Denuvo creates a unique ID based on your PC's specific hardware (CPU, motherboard, etc.). denuvo ticket generator