Who used this, and where?

Cracked by p vs np , Rogi , Shrey Goyal , madhur , Jean Valjean , Raghuvansh , Logik , joe , Higgers , byslexia , varuns88 and sandic.

p vs np, Rogi, Shrey Goyal, madhur, Jean Valjean, Raghuvansh, Logik, joe, Higgers, byslexia, varuns88 and sandic